Why do I get the error "Undefined function or variable"?

I am receiving one of the following error messages. How can I resolve this issue?

Undefined function or variable ‹Name›.
Unrecognized function or variable ‹Name›.
Undefined function or method ‹Name› for input arguments of type ‹ClassName›.

Answer 1

[MathWorks Support Team]

MATLAB does not recognize the specified string as the name of a function on the MATLAB path or as a variable. "Undefined function or variable" can be caused by:

1) Trying to use a variable that has not been defined before this line of code executes.

>> x=1:10;
>> t=x.^2;
>> plot(x,y)
Undefined function or variable 'y'.
% Possible corrections:
% Change line 3 to "plot(x,t)"
% or change line 2 from "t=x.^2;" to "y=x.^2;"

2) A typographical error when typing a function or variable name. However, later versions of MATLAB try to resolve these typos with “Did you mean” suggestions. For example,

>> foo = 42;
>> fo0
Undefined function or variable 'fo0'.
Did you mean:
>> foo

3) The wrong case for a function or variable name. Later versions of MATLAB try to resolve these typos with “Did you mean” suggestions.

4) Changing directories so that a function you used is no longer on the MATLAB path.

5) Trying to use a function for which you are not licensed or that belongs to a toolbox that isn’t installed. In later versions of MATLAB, this is not an “Undefined function or variable” error, and MATLAB lets you know that you are either not licensed to use the function or the appropriate toolbox is not installed.

6) Calling an object method without an object as the first input.

7) Using a MEX function that is compiled on a platform different from the one in use.

8) Trying to use a function that has been removed from MATLAB. In later versions of MATLAB, this is not an “Undefined function or variable” error, and MATLAB lets you know the new, preferred function to use.

Solution:

• Verify that the undefined function or variable is visible (it is on the path or in the current workspace) and that it has been defined before this line of code executes.
• If you are certain the variable or function exists, verify the case of the function or variable name. If the undefined identifier is a function, the 'which' function can help you verify that it is visible to the function where the error occurs.
• If you are having problems with your MATLAB search path, run the following MATLAB commands and then restart MATLAB:

>> restoredefaultpath % This will remove any custom paths
>> rehash toolboxcache
>> savepath

[Dhruba Raj Dhakal]

Why this error occurs when I use antenna toolbox???

[Dhruba Raj Dhakal]

this code is copied from https://www.mathworks.com/help/antenna/examples.html

[Walter Roberson]

The routine is new in the examples as of R2015a, but the location of the file did move as of R2017a, moving from toolbox/antenna/atexamples/dipole_tuner.m to examples/antenna/dipole_tuner.m

[Neeli Sai Krishna]

By the way why the error occured in this 'dipole' code, as code seems ok.

can anyone explain ....??

[Walter Roberson]

eeli Sai Krishna: please give more information about what code you are executing, and which MATLAB release you are using.

[Ugur Sancar]

Thanks!

These worked for me.

restoredefaultpath % This will remove any custom paths
rehash toolboxcache
savepath

[Muhd Farkhan]

Hello, I'm having the same problem, here's my coding

where the error is at X = data_fault; , Im still new , do teach me

clc;
clear all;
load ('data_fault');
%load sample data
X = data_fault;
%train autoenc
autoenc = tranAutoencoder(X);
%reconstruct
XReconstructed = predict (autoenc,X);
%computing mseError
mseError = mse(X-XReconstructed)

[Monika Biela]

restoredefaultpath % This will remove any custom paths
rehash toolboxcache
savepath

These worked for me- also :)

[Liam Cawley]

Why do I get an undefined function error when using it as function input? It's a parameter, why would I need to initialize it? I also did intialize it but nothinh changed. Pic attached.

[Walter Roberson]

It's a parameter, why would I need to initialize it?

If you do not initialize notes before invoking play_notes(notes, pauses) then how is it to know which sequence you want to play?

notes = 'DEAD';
pauses = [1/20, 1/10, 1/5, 1/20];
play_notes(notes, pauses)

[Walter Roberson]

In addition to the Mathworks list:

9) You might be trying to use a variable that has been cleared.

If your code includes

clear all

or

clearvars   %without the name of a variable

then you should probably get rid of those statements from your code.

If you had those statements in order to prevent old variables from interfering with new uses, then you should probably be rewriting the code as a function.

Answer 2

[Alex Alex]

Undefined function or variable 'shaperead'. On the description page for this function it says "Introduced before R2006a". I use MATLAB R2015b- academic use. Does that mean that the function is not available for student license? How can I perform this kind of check in the future? Many thanks, Alex.

[Florian Morsch]

Type "ver" into the Matlab Command Window. shaperead is part of the Mapping Toolbox, if you dont own it you cant use the function. Normaly it should be included in the academic license, so check if you have downloaded it. If not you may try to load it.

If its not for free in your version you may try to contact your IT so it can be included into the license.

Otherwise, if you have newly created the code try to restart matlab once, sometimes that helps, too.

Best regards

Answer 3

[Saadia Talay]

Undefined function or variable 'lgemri' when I enter the following:

[X,meta]=nrrdread(lgemri);

The nrrdread function has been taken from the matlab file exchange: https://www.mathworks.com/matlabcentral/fileexchange/34653-nrrd-format-file-reader

The lgemri is a file in nrrd format.

[Walter Roberson]

lgemri should be a character vector that contains the name of the file.

[Saadia Talay]

Thanks! That was stupid of me.

Answer 4

[Iman Tahamtan]

I am facing this error when running y_lambda=lambda: Undefined function or variable 'lambda'.

[Walter Roberson]

Where do you expect that your program should be getting a value of lambda from?

[Liam Cawley]

Answer 5

[ishwarya ramesh]

Undefined function or variable 'drivingScenario'. why do i get this error i just need a clear explanation

[Florian Morsch]

Why do you get this error? Because the variable or function 'drivingScenario' is undefined and you try to use it. With the information you gave (none at all) noone will be able to help you. Where do you use the variable/function? Which toolbox do you intend to use? If its only a part of code then you maybe have do declare the missing functions/variables yourself.

[Walter Roberson]

That function is part of the Automated Driving System Toolbox, which was new as of R2017b. You probably do not have that installed or licensed. If I recall correctly it is not available for Student licences.

[Mariah Rallos]

is the function position() available for Student licences? I tried the function as a parameter of uavPlatform()

[Walter Roberson]

@Mariah Rallos

According to your question https://www.mathworks.com/matlabcentral/answers/1469696-unrecognize-position-function?s_tid=srchtitle you were trying to use a variable named position not a function named position

Answer 6

[Liliana Malik]

why do i get Undefined function or variable 'pixelLabelDatastore' and Undefined function or variable 'batchNormalizationLayer'

[Florian Morsch]

This function is implemented since Matlab R2017b, is your Matlab version R2017b or above?

This function is used in the Computer Vision System Toolbox, type "ver" in your Matlab Command Window to see if you already own the toolbox, if not you have to get that.

If you own the toolbox and the right Matlab version try to restart Matlab once, sometimes that helps too.

Best regards

[Navin Patle]

Is there a replacement for this code for an older version. I am using Matlab R2017a

[Walter Roberson]

No, there is no replacement for pixelLabelDatastore in earlier versions.

[Akib Rahman]

@Walter, batchNormalizationLayer also need Matlab R2017b?

[Walter Roberson]

Yes, batchNormalizationLayer needs R2017b.

Answer 7

[tim jelly]

When trying to make a GUI i get the error:

Undefined function or variable 'radioChanged'

Error while evaluating ButtonGroup SelectionChangedFcn.

I dont have "radioChanged" in my code so how do I fix this, thanks

[Walter Roberson]

What shows up if you use

radios = findall(0, '-property', 'SelectionChangedFcn');
get(radios, 'SelectionChangedFcn')

Answer 8

[Francisco Santamaría]

for i=1:(npop+1)
      dron(i,:)=rand(1,nvar).*(xmax-xmin)+xmin;
      cost(i)=CostfunctA3(dron(i,:));
      dron_cost(i,:)=[dron(i,:) cost(i)]
end
When trying to make a run i get the following error:
Undefined function or variable 'CostfunctA3'.

[Stephen23]

@Francisco Santamaría: have you defined/downloaded a function named CostfunctA3? Is it on the MATLAB path?

Answer 9

[Waqas Waqas Ul Hussan]

hi

I am getting this problem in Matlab when plotting the graphs with shaded area.

Undefined function or variable 'jbfill'.

These below are my code lines. error is in line 127 below.

[Walter Roberson]

jbfill is possibly https://www.mathworks.com/matlabcentral/fileexchange/13188-shade-area-between-two-curves

[Arihant Sureka]

Hi Walter

I'm running parallel Simulation in Simulink with Matlab as the initialization file and the Code is as follows : -

mv_sweep = Mass.m_v*(.70:0.1:1.20);
numSims = length(mv_sweep);

simIn(1:numSims) = Simulink.SimulationInput(model);

for idx = 1:numSims
    simIn(idx) = simIn(idx).setVariable('Mass.m_v', num2str(mv_sweep(idx)));

end

simout = parsim(simIn);

When I run the Simulation, it says :

Completed 1 of 6 simulation runs. Run 1 has errors.

Completed 2 of 6 simulation runs. Run 2 has errors.

Completed 3 of 6 simulation runs. Run 3 has errors.

Completed 4 of 6 simulation runs. Run 4 has errors.

Completed 5 of 6 simulation runs. Run 5 has errors.

Completed 6 of 6 simulation runs. Run 6 has errors.

Opening the simout struct the error reads: Error evaluating expression 'T_SIM' for 'StopTime' specified in the Configuration Parameters dialog for block diagram 'Zweispur_2017b'.Caused by: Undefined function or variable 'T_SIM'. Variable 'T_SIM' does not exist.'

Now my Question is I've already defined my variables before in the script still the error. Also, I've tried all Solutions Data Dictionary, InitFcn, PreFcn, Srcworkspace and stuff but the Problem persists! Please guide further.

[Walter Roberson]

I do not see any obvious setting of T_SIM or stop time in your code?

If you were not running in parallel, then sim() would probably look in your workspace to try to find the variable T_SIM and then would probably look in the base workspace for it. I would not expect that to work for parsim(), so you might have to do something like

T_SIM = 10;    %seconds

simIn(idx) = simIn(idx).setVariable('Zweispur_2017b.T_SIM', num2str(T_SIM));

I am not certain that is the correct variable name, though.

[Arihant Sureka]

Hi Walter

Appreciate you for your assistance. The solution was calling the Initialization script in the function callback GUI of Simulink (PreFcn and InitFcn).

Earlier the solution didn't work because of the bug in 2017b. Had to clear all the slrpj stuff.

Thanks and Cheers

[RW Student]

Hi Arihant, I am currently struggling with the same error using parsim as you described here. Can you please elaborate on how to solve this problem? I am using 2017b as well.

[Arihant Sureka]

Hi

Please try out these following steps -

1. After your parsim commands at the out command line use the following -

out = parsim(in,'TransferBaseWorkspaceVariables',on 'ShowProgress', 'on') as also mentioned on help page.

or

2. Use function callbacks which can be accesed in simulink from File-> Model Properties -> Model Properties -> Callbacks.

Then punch name(s) of your initialization script in the PreLoadFcn and InitFcn without .m at the end of the name.

For example - If your script is call "Init_SIM", then it would just go as Init_SIM in the callbacks and not as Init_SIM.m.

Regards

[yousra aichoun]

hi ,

can you help me please i'm having the same problem but with simulink ,once i run the simulation , it display :Undefined function 'modelRegistry' for input arguments of type 'PmSli.RunTimeModule'.

Answer 10

[David Akin]

Same error but using a Mathworks example. Here's the contents of fact.m

function f = fact(n)
    f = prod(1:n);
end

Located here:

/opt/software/MATLAB/2018a/toolbox/local/fact.m

When trying to use:

>> y=fact(5);
Undefined function or variable 'fact'.

I cd'ed to the directory containing the file before starting MATLAB and it's in the search path:

>> path

                  MATLABPATH

          /opt/software/MATLAB/2018a/toolbox/local
.
.
.

Any suggestions?

>> dos('cat /opt/software/MATLAB/2018a/toolbox/local/fact.m');
function f = fact(n)
    f = prod(1:n);
end

[Arihant Sureka]

Use "factorial" command instead of fact since the "fact" command is only used from 2018b. Previous versions have factorial.

[Walter Roberson]

Your path is /opt/software/MATLAB/2018a/toolbox/local but the fact.m is stored in /opt/Matlab/2018a/toolbox/local/fact.m which is a different directory

[David Akin]

I've fixed that. For some reason I've still getting the error.

>> dos('cat /opt/software/MATLAB/2018a/toolbox/local/fact.m');
function f = fact(n)
    f = prod(1:n);
end
>> path
                  MATLABPATH
          /opt/software/MATLAB/2018a/toolbox/local
...

>> y=fact(5);
Undefined function or variable 'fact'. 
>>

[Steven Lord]

Do not store your own files in a directory under the matlabroot directory. See this documentation page for some of the reasons why. If you must do so, that documentation page will also tell you how you can.

Consider storing your files in your userpath folder instead.

Answer 11

[David Akin]

It's an example only, as I've got some code from a colleage (a collection of .m files) I'd like to use. However it's not finding the functions. Thank you though.

Answer 12

[michael]

(Matlab R14)

Something strange is that when I try to call some function from toolbox (communication) I'm getting that it is not existing.

Even when I'm going to %MATLABROOT%\toolbox\comm\comm where the m file is existing, I still can't run it.

Please suggest what is the issue

[Walter Roberson]

restoredefaultpath
rehash toolboxcache

If that does not work then please show us the complete error message and also the results of using the "which" command with the -all option and the name of the function .

[Hector Diaz]

Thanks for the advice!!, it works perfectly to solve the problem!!

Answer 13

[Darrell]

I have seen this issue before with other functions. As stated before, first check that the function name is spelled correctly and that the function is located in the matlab search path. Assuming those two things check, then delete the path where the function is located, then reset the path. I would also will restart Matlab. I'm not sure why, but this seems to correct the problem.

Answer 14

[Al3jandro]

Hi.

I'm making this rutine, but i cant get values of K, how can I resolve this issue?

clear;
clc;
A=xlsread('ANÁLISIS DE ESTRUCTURAS _ INPUT2','BARRAS','B1:B6');
I=xlsread('ANÁLISIS DE ESTRUCTURAS _ INPUT2','BARRAS','C1:C6');
E=xlsread('ANÁLISIS DE ESTRUCTURAS _ INPUT2','BARRAS','D1:D6');
W=xlsread('ANÁLISIS DE ESTRUCTURAS _ INPUT2','BARRAS','u1:u6');
L=xlsread('ANÁLISIS DE ESTRUCTURAS _ INPUT2','BARRAS','Q1:Q6');
a=xlsread('ANÁLISIS DE ESTRUCTURAS _ INPUT2','BARRAS','R1:R6');
n=xlsread('ANÁLISIS DE ESTRUCTURAS _ INPUT2','BARRAS','V3');
nGDL=xlsread('ANÁLISIS DE ESTRUCTURAS _ INPUT2','NUDOS','J2');
GDLG=xlsread('ANÁLISIS DE ESTRUCTURAS _ INPUT2','BARRAS','K2:P4');
for i=1:n
   A=A(i);
   I=I(i);
   E=E(i);
   L=L(i);
   a=a(i);
   KL(i)=[E*A/L 0 0 -E*A/L 0 0;0 12*E*I/L^3 6*E*I/L^2 0 -12*E*I/L^3 6*E*I/L^2;0 6*E*I/L^2 4*E*I/L 0 -6*E*I/L^2 2*E*I/L;-E*A/L 0 0 E*A/L 0 0;0 -12*E*I/L^3 -6*E*I/L^2 0 12*E*I/L^3 -6*E*I/L^2;0 6*E*I/L^2 2*E*I/L 0 -6*E*I/L^2 4*E*I/L];
   T(i)=[cos(a) sin(a) 0 0 0 0;-sin(a) cos(a) 0 0 0 0;0 0 1 0 0 0;0 0 0 cos(a) sin(a) 0;0 0 0 -sin(a) cos(a) 0;0 0 0 0 0 1];
   KG(i)=T(i)'*KL(i)*T(i);
   G=[GDLG(i,1) GDLG(i,2) GDLG(i,3) GDLG(i,4) GDLG(i,5) GDLG(i,6)];
   KT=zeros(nGDL,nGDL);
   KT(G,G)=KG(i);
   if i==1
       K=zeros(nGDL,nGDL);
   end
   K=K+KT;
end
disp(K)

[Walter Roberson]

What is the value of n?

[Al3jandro]

n=3

[Walter Roberson]

A=A(i) replaces the array A with a single scalar value. After the statement, A is size 1x1 and it is not possible to access A(2)

Answer 15

[clpi]

Hello !

I have a matlab function which at a certain point calculates sin(2*pi*freq*t_array) (t_array in an array of size (1,2000).

I tried to call this function via matlab.engine but I got the error message: "Undefined function 'sin' for input argument of type 'int64' "

I wanted to add the file 'sin.m' to my working directory but it is not a function script, it is a simple text.

I would be very grateful of any help

Thank you !

Answer 16

[Regina Vivian Barli]

Hello, I happen to stumble upon similar problem.

So I have been trying to use matlab for video stabilising, but keep getting this error:

Undefined function or variable 'cvexEstStabilizationTform'.

even though I have followed Matlab's instruction by running a command by clicking

edit cvexEstStabilizationTform.m

Can anyone please suggest me what to do?

Kind regards

Vivian

Answer 17

[Ashwanth Ramesh]

I am trying to upload audio data into matlab using audioDatastore funtion and the same error pops up. Please help!

[Stephen23]

https://www.mathworks.com/help/audio/ref/audiodatastore.html

was introduced in R2018b.

[Ashwanth Ramesh]

okay, thank you so much..

Answer 18

[Sara Alkhaldi]

The functions stepseq, impseq, and nextpow2 do not work in the MATLAB R2018B and I don't know why. Can someone please help?

[Walter Roberson]

nextpow2 should be part of MATLAB but the other two are from a book https://www.mathworks.com/matlabcentral/fileexchange/2189-digital-signal-processing-using-matlab

Answer 19

[abood qamar]

can please help me to solve this problem

[Image Analyst]

Why do you think that function SHOULD exist? Do you think it's a built-in toolbox function or did you write it? Is it on the search path? If so, this should show some existing file:

which -all guard_interval

If you still need more help, create a new question rather than continue the discussion here.

[Walter Roberson]

Is this related to MIMO-OFDM Wireless Communication with Matlab book?

Answer 20

[apri zulham]

i need help!!

Undefined function or variable 'imaghwinfo'.

Error in CAMERA_MATLAB>pushbutton1_Callback (line 81)

IAHI = imaghwinfo;

Error in gui_mainfcn (line 95)

feval(varargin{:});

Error in CAMERA_MATLAB (line 42)

gui_mainfcn(gui_State, varargin{:});

Error in

matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)CAMERA_MATLAB('pushbutton1_Callback',hObject,eventdata,guidata(hObject))

81 IAHI = imaghwinfo;

[Walter Roberson]

The proper function name is imaghwinfo . You need to change line 81 of CAMERA_MATLAB.m

Answer 21

[CS]

Undefined function or variable 'readmatrix'.

I have a basic_matrix.txt file including

6,8,3,1
5,4,7,3
1,6,7,10
4,2,8,2
2,7,5,9

I want to read the contents of this file (basic_matrix.txt). When I write

M = readmatrix('basic_matrix.txt')

MATLAB gives an error as

Undefined function or variable 'readmatrix'.

M = readmatrix('basic_matrix.txt')

Does anyone know what the reason is?

I am just trying to implement what is written on https://www.mathworks.com/help/matlab/ref/readmatrix.html in order to read the contents of a file. I am using MATLAB R2018b.

Any help would be appreciated.

[Walter Roberson]

needs r2019a.

For your release use readtable with readvariablenames false and then table2array

[Walter Roberson]

Or really for that file you could just load() the file.

Answer 22

[Alex Backer]

This happened to me with mean and median when I indvertently called it mean(variable,:) instead of mean(variable,1).

Answer 23

[José Moctezuma Rodríguez Santillán]

Undefined function or variable 'isfile'. You cannot find the isfile function in MATLAB R2015. any alternative to replace? this is my code;

options = weboptions('Username', 'insertusername', 'Password', 'insertpassword');
year = 2016;
month = 03;
time = 0900;
start_jd = 011;
end_jd = 045;
for jd = start_jd:end_jd
    cd = day(datetime((year-1),12,31) + days(jd));
    filename = ['SST' num2str(year) '_' num2str(jd) '.nc'];
    if isfile(filename)
        fprintf('already have the file |%s|\n',filename);
    else
        url=['https://data.nodc.noaa.gov/ghrsst/L4/GLOB/JPL_OUROCEAN/G1SST/2016/' num2str(year) '/' num2str(jd)];
                  outname=websave(filename,url,options);
         
        fprintf('got weather data file |%s|\n',outname);
    end
end

[Walter Roberson]

Change

if isfile(filename)
    

to

if exist(filename, 'file')

Answer 24

[Yinying Wang]

Help!

I received "undefined function 'string2char' for 'char' type input arguments".

This error occurs only when I use mphload('filename') in an exe file. When in a .m file this line works well. I thought maybe mphload use 'string2char' function whatever its input argument type is. I use mphload("filename") instead. It still doesn't work...

Answer 25

[Joey Porter]

Hi all,

I've had this error after a newly created function would give this error even though it was in the correct path and was user-defined (so no problem with needing the correct toolbox or licencing).

The name of the function and the file name you save it as MUST BE THE SAME.

I had saved my function a different name and therefore gave this error. This tip isn't in the accepted answer's response so give this a try.

[Walter Roberson]

This is not the case in MATLAB itself: the rule is that the first function in a function file will be known by the name of the file when they differ.

In scripts, the name of the function must not be the same as the name of the file.

What I do not know about at the moment is the case of Live Script when the first thing in the file is a function.

MATLAB Function Blocks in Simulink seem to have their own rules.

[Joey Porter]

Thanks for your feedback Walter.

In terms of the file name I was referring to the file name of the function, not the file name of the script (I can see how that would produce an error).

Does that align with what you mean?

[Walter Roberson]

Store the below in file testname.m not in file wrongname.m

function wrongname
    dbstack
end

Now at the command line invoke

testname

The command will run, and will tell you

> In testname (line 2)

This establishes that it is not necessary in MATLAB for the name of the function to match the name of the file it is in, and that the name of the file will "win" over the name of the function.

The editor will give you a warning that the function wrongname is known by its filename testname -- but that is a warning not an error.

[Joey Porter]

I've just checked my source (https://www.mathworks.com/help/matlab/matlab_prog/resolve-error-undefined-function-or-variable.html) and you are correct, apologies!

I have rechecked my file names and they are slightly different (not sure how I solved this error then?).

Thank you for you correction and I'll delete this post after you've seen this to avoid confusion.

[Walter Roberson]

I recommend leaving it for other people to learn from.

[Joey Porter]

Okay, sure.

Answer 26

[soufiane kabiri]

hi everyone, i hope you'll help me with that

i have the same error "Undefined function or variable 'HMMem'"

this the code:

function [Q, g, l] = HMMbaumwelch(y, nu, tol, maxIt, Q, g)
% HMMbaumwelch compute maximum likehood estimate using Expectation-Maximization
% iterations
%
%  in : y = vector of observations 
%       nu = initial distribution of the hidden chain
%       tol = tolerance for the stopping criterion
%       maxIt = maximal number of iterations
% out : Q = estimate of the transition matrix of the hidden markov process
%       g = estimated probabilities of transition: gh(x,y) = estimate of P(Y=y | X=x) for 1<=x<=k
%       l = log-likelihood of y for parameters Q and g
%
% Example :
      n = 10000;
      nu = [0, 1];
     Q = [0.8, 0.2; 0.1, 0.9];
    g = [0.25 0.25 0.25 0.25; 0.05 0.05 0.45 0.45];
    [x,y] = HMMsample(nu, Q, g, n);
   [Qh, gh] = HMMem(y, nu);
%       % compare estimates with truth: note that the order of the hidden
%       % states may not be preserved
   Q, Qh
   g, gh

% References: Hidden Markov Models by Cappe, Moulines, Rydden
% Springer series in statistics

% by Aurelien Garivier, CNRS & Telecom ParisTech
% last revision February 7, 2012

global myfilter mysmoother % should be either HMMfilter/HMMsmoother, or HMMfilter_C/HMMsmoother_C

if nargin<4, maxIt = 100; end
if nargin<3, tol = 1e-4; end

k = length(nu); r = max(y); n = length(y);
Y = zeros(n, r); Y(sub2ind([n, r], 1:n, y))=1;

% if they are not provided, sample random initial transition and emission matrices
if nargin<5, Q = rand(k); Q = Q ./ (sum(Q, 2)*ones(1, k)); end 
if nargin<6, g = rand(k, r); g = g ./ (sum(g, 2)*ones(1, r)); end 

it = 0; oldQ = Q; oldg = g+tol+1;
while ((norm(oldQ(:)-Q(:), 1) + norm(oldg-g, 1) > tol) && (it<maxIt))
  it = it + 1;
  % compute the posterior distribution for the current parameters
  [phi, c] = myfilter(y, nu, Q, g);
  beta = mysmoother(y, Q, g, c);
  post = phi .* beta;
  
  % expectation of the number of transitions under the current parameters
  N =Q.*(phi(:, 1:(end-1))*(beta(:, 2:end).*g(:, y(2:end))./(ones(k, 1)*c(2:end)))');   
  % expectation of the number of emissions
  M = post * Y;

  % re-estimation
  oldQ = Q; oldg = g;
  Q = N ./ (sum(N, 2) * ones(1, k));
  g = M ./ (sum(M, 2) * ones(1, r));
end
l = sum(log(c));

[Walter Roberson]

Your code does not show any function definition for HMMen .

Your code looks like a modified version of https://github.com/ryanrhymes/ehmm/blob/master/%2Bhmm/HMMbaumwelch.m

Answer 27

[islam dib]

Undefined function or variable 'seriallist'.

release 2013b

what's wrong ?

[Walter Roberson]

serialport objects are a much newer release than what you have. You need to use serial() objects and https://www.mathworks.com/help/matlab/ref/instrfind.html

Answer 28

[AMAR Abdelhamid]

hello

i have this problem :

Error using mphload

Cannot find COMSOL server

how can i sole it, please.

[Walter Roberson]

Have you installed the third-party product COMSOL ?

https://www.mathworks.com/products/connections/product_detail/comsol-multiphysics.html

Answer 29

[Eamon Devlin]

I have a probelm:

I have a list of varibles defined at the top of my script but when I am trying to create a function the defined variables (which are in the workspace too) are not being recognised.

%% Damped Oscillating Spring System

m_c = 2; %Container mass in kg
s1 = 16.0; % Spring constant, spring 1, N/m
s2 = 16.0; % Spring constant, spring 2, N/m
c = 2.0; % Damping Coefficient, Ns/m
d = 0.6; % Initial gap between mass and spring 2, m 
t_total = 20.0; % Total interation time, s
dt = 0.01; % Interation Step, s 
x =1; % Initial displacement, m 
g = -9.81; % Gravitational Acceleration, m/s^-2
t = 0: dt: t_total; % Total Time for plotting graphs
r_m = 0.1; % Rate of mass of fluid change in kg/s
m_f_max = 4; % Maximum Fluid mass

%Then there is a choice menu and other calculations where the cases are all set out:

case {4} %Select if the containter is filled with fluid duing the simulation 
            
            [r_m] = fluidcalcs();

function [r_m] = fluidcalcs()
r_m = input('Rate of Change of Fluid Mass (kg/s)?\n\n');

if (r_m * t_total) > 4
 disp('Invalid Entry - Maximum Fluid Mass is 4kg\n\n');
    r_m = input('Rate of Change of Fluid Mass (kg/s)?\n\n');
end 
end

In this case the 't_total' variable is not being recognised. The code works fine if I replace the variable name with the value. But the varables need to be changed each time so having a set value isn't what I want.

Any solutions?

[Walter Roberson]

That structure is not valid. case is only valid inside switch() but you cannot define a function inside of switch.

Answer 30

[Evelin Ponce]

Maybe you should try to look for the function on the 'Add Ons' section so you could find the package which contains the function you need. All you have to do is to install the package.

Answer 31

[khallad jobah]

rigid3d function is not defined

my code : rigid3d(eye(3), [0 0 0])

[Walter Roberson]

rigid3 requires Image Processing Toolbox, R2020a or later.

[khallad jobah]

Thanks, I figured that I have to update my Matlab ( it was 2019)

Answer 32

[JITHIN P M]

While running a mathlab code for Beamforming am getting the error as mentiond below,

" Unrecognized function or variable 'm_proj' "

Anyone who knows abouth this please help me to solve the issue. Due to this error my whole work is pending. Kindly please help me out.

[Walter Roberson]

m_proj is part of the third-party M_MAP toolbox, https://www.eoas.ubc.ca/~rich/mapug.html

[JITHIN P M]

Thankyou for our help

Answer 33

[Feng Chen]

Hi, I get the following error. Looking for solutions

Unrecognized function or variable 'xVOCap'.

Error in YTOwrapper (line 53)

res(ii).ap_auc = xVOCap(res(ii).rec, res(ii).prec);

[Walter Roberson]

https://git.gmu.edu/zrajabi/faster_rcnn/-/tree/master/utils

Answer 34

[Rupam Jaiswal]

Unrecognized function or variable

'CentroidTermX'.

what can i do?

[Walter Roberson]

[CentroidTermX,CentroidTermY]=find(ZTerm);

according to archives I find of Florence Kussener, The MathWorks % Application Engineer % August 2007

Answer 35

[Arnaud Yossa potawe]

Anyone who knows abouth this please help me to solve the issue. Due to this error my whole work is pending. Kindly please help me out.

[Walter Roberson]

Sorry, I do not find any references to mbs_bode routine anywhere. Where did you find the code?

Answer 36

[MEGHA GUPTA]

Unrecognized function or variable 'gen_gfdm' how to solve this problem in matlab simulator

[Walter Roberson]

@MEGHA GUPTA

You need to install https://github.com/vodafone-chair/gfdm-lib-matlab in MATLAB Online.

Answer 37

[Amy Morris]

I am getting 'Unrecognized function or variable 'dicm2nii'' when trying to use dicm2nii . Any suggestions for why this function isn't working?

[Walter Roberson]

You might need to install https://www.mathworks.com/matlabcentral/fileexchange/42997-xiangruili-dicm2nii

You can also install this from the Add-On Explorer.

[Amy Morris]

That worked! Thank you so much!

Answer 38

[ABHISHEK MAURYA]

while running vanet in matlab2021a in ubuntu desktop i am getting this error, I don't have any idea why this is happenning. Any valuable suggestion is welcome. Thank you!

Checking app_wsmp2msg_mex...

Checking phy_waveform2psdu_data_mex

phy_waveform2psdu_data_mex not found.

Unrecognized function or variable 'helperSubcarrierIndices'.

Error in phy_channelpacketDetection_data (line 17)

[data,pilots] = helperSubcarrierIndices(cfgnonHT,'HT');

Error in fcn_codeGen (line 28)

[pktOffset,cfgnonHT,outWaveform] = phy_channelpacketDetection_data(inWaveform,SNR,PSDULength);

Error in vanet_init (line 155)

fcn_codeGen

Error in fcn_runModel (line 24)

vanet_init();

Error in vanet>runButton_Callback (line 187)

fcn_runModel(simTime,roadtype,minVehicleNum,maxVehicleNum,gap,simRound,errBar,macTXT,appTXT,mapUI)

Error in gui_mainfcn (line 95)

feval(varargin{:});

Error in vanet (line 42)

gui_mainfcn(gui_State, varargin{:});

Error in matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)vanet('runButton_Callback',hObject,eventdata,guidata(hObject))

Error while evaluating UIControl Callback.

[Walter Roberson]

https://github.com/seemoo-lab/mobisys2018_nexmon_channel_state_information_extractor/blob/master/matlab/helperSubcarrierIndices.m

Answer 39

[Mariya Ali]

Hi!

I am getting an error calculating the lyaprosen. The error I get is

"Unrecognized function or variable 'dist'.

Error in lyaprosen (line 106)

Dmm=dist(EEMmm(:,1:k)')"

[Walter Roberson]

dist() is part of the Deep Learning toolbox

Answer 40

[Gonzalo Cruz Torrijos]

>>fibonacci(n) Unrecognized function or variable 'n'.

[Walter Roberson]

The message appears to be correct. You can see on the left that the only variables that appear to be defined in the base workspace are ans, b, x, and something that begins with RESTOREDEFAULT . n is not defined.

It looks to me as if the code is probably ignoring whatever is being passed to it, and is instead using input() to read from the user.

[Gonzalo Cruz Torrijos]

Thanks.

Answer 41