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Star Strider


Last seen: Today
13,077 total contributions since 2012

Hic sunt dracones!

PROFESSIONAL: Physician (M.D.): Diplomate of the American Board of Internal Medicine; M.Sc. Biomedical Engineering: Instrumentation, Signal Processing, Control, System Identification, Parameter Estimation

NON-PROFESSIONAL: Amateur Extra Class Amateur Radio Operator; Private Pilot, Airplane Single Engine Land, Instrument Rating Airplane; Gamer

NOTE: I do not respond to emails or personal messages, unless they are about my File Exchange contributions.

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Answered
We need to install Global Optimization Tool
Try running these lines from a script or your Command Window first: restoredefaultpath rehash toolboxcache That may fix th...

1 hour ago | 0

Answered
convert plot3 to contour plot
Use the griddata function: a = randi(9, 10, 3); x = a(:,1); y = a(:,2); z = a(:,3); xv = linspace(min(x), max(x), 6); ...

2 hours ago | 0

Answered
Index exceeds matrix dimensions error "for my code"
It is unfortunate that we do not get the opportunity to see what ‘X’ is for the various files, nor anything else about them. ...

11 hours ago | 0

Answered
this is a part of my test and i cant find the mistake in this .
The obvious observation is that ‘x’ is going to be less than 10 from the initial iteration through how many iterations it takes ...

13 hours ago | 0

| accepted

Answered
Error in saveas, Invalid figure handle
I cannot run your code because I do not have the necessary files. However: %% Let's plot T and RH times...

16 hours ago | 0

Answered
Custom colour bar, excluding the Blue from RGB.
Define ‘CustomColourMap’ as: CustomColourMap = @(x) [linspace(0,1,x).' linspace(1,0,x).' zeros(x,1)]; then to use it: Cust...

17 hours ago | 0

Answered
how to make fuction from changing varibles
That is relatively straightforward to do with ndgrid or meshgrid. Try this hypothetical example: Z = @(x,y,z) x.^2 + y.^2 +...

20 hours ago | 0

Answered
Add 0.5 *0.5 degree grid on figure (country)
This illustrates the general approach: x = linspace(44, 64); y = linspace(25, 40); t = linspace(0,2*pi); circx = 0.25*(ma...

21 hours ago | 0

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Answered
How can i plot with if statement ?
Try this: x=[10 20 30 40 50 ] ; for k = 1:numel(x) if x(k)==10 y(k)=((10*10^6)*.1523)./ x(k) ; end if...

22 hours ago | 0

Answered
Make a Plot using loop
Subscript ‘Cp’ and the plot magically appears! Dg=150; %mg Vd=50; %L Ke=0.4; %h^-1 Ka=1.6; %h^-1 t=0:0.1:10; for k = 1...

24 hours ago | 0

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Answered
titel for tables with spce between the words
The R2019b release allows spaces and other (inluuding Unicode) characters in table variable names. Upgrade to it and you will b...

24 hours ago | 1

Answered
How to change the size of error bar?
I am not certain what you want. Try this: errs = rand(1,10); x = 1:10; y = randi([10 20],1,10); figure plot(x, y) ho...

1 day ago | 0

Answered
Ending a recursive function
I have not run your posted code, however two things are immediately apoparent. First, in the calls to ‘mysequence’, the fun...

1 day ago | 0

Answered
Relational operator == doesn't work properly in some cases!
You are seeing the effects of floating-point approximation error. See for example: Why is 0.3 - 0.2 - 0.1 (or similar) not e...

1 day ago | 0

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Answered
C.T. signals convolution in Matlab
One approach: syms h(t) x(t) s t Fcn1 = h(t) == exp(-2*t)*4 - 4*exp(-t); Fcn2 = x(t) == heaviside(t); convlap = laplace(Fc...

2 days ago | 0

| accepted

Answered
how can i Solve this equation With ode45
Try this: syms y(t) w T Y DE = diff(y,2) + w; [VF,Subs] = odeToVectorField(DE) ODEfcn = matlabFunction(VF, 'Vars',{T,Y,w})...

2 days ago | 0

Answered
Problem using function fsolve
Use a different initial parameter estimate vector. Try this: z0 = rand(3,1); Your code divides the parameters by each othe...

2 days ago | 0

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Answered
Creating a 3d plot of the solutions to an ODE as the time a switch condition activates varies
I am not certain what you want to do. Try this: function L2_ode45 tspan = linspace(0, 500, 50); t1 = 100:100:500;...

2 days ago | 1

| accepted

Answered
Replacing NaN with last real value
If you have R2016b or later releases, use the fillmissing function. I am not certain what you want to do, so see the method a...

2 days ago | 0

| accepted

Answered
Peak value on plot graph
If you have R2017b or later, you can use the islocalmax function. If you have the Signal Processing Toolbox, you can use the ...

2 days ago | 0

| accepted

Answered
Finding the percentage of NaN cells in columns
This does everything for all the tables in ‘C’: D = load('C.mat'); C = D.C; for k = 1:numel(C) C{k}(:,1:4) = fillmissin...

2 days ago | 1

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Answered
Import correct date and time from different columns in Excel
Try this: In = readtable('Airport 2019 (1.5-30.9).xlsx', 'PreserveVariableNames',1); hrmnsc = datetime(compose('%04d\n',In.Ti...

3 days ago | 0

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Answered
where are my data?
Try this: F = openfig('untitled.fig'); ax = gca; lines = findobj(ax, 'Type','Line'); for k = 1:numel(lines) x{k,:} = l...

3 days ago | 1

| accepted

Answered
ODE45 Unable to perform assignment because the left and right sides have a different number of element
The problem is ‘G’. Since it is a vector, all computations involving it are going to be arrays. You can use it, however in e...

3 days ago | 0

Answered
Solve system of differential equations with vector input
In the derivation, let ‘a’ simply be an undefined constant, and define the initial conditions as 0 (unless you want them to be s...

3 days ago | 0

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Answered
Problem with if statement
You almost answered your own Question! See if the any function will do what you want.

3 days ago | 0

Answered
Is it possible to extract also R^2 value from linear fit between 2 vectors ?
It is, however polyfit wil not do it for you. Try this: x = 1:10; % Create ‘x’ y = r...

3 days ago | 1

Answered
add the peak values of a signal to a graph regardless of number of peaks
Your code is a bit difficult to follow. Insert this text call just after the plot call for the red circles: text(picos(:,1)...

3 days ago | 0

Answered
Error using integral function
Try this instead: ALP = @(j,l,x) ((-1)^l)*(1-x*x)^(l/2)*diff(legendreP(j,x),l); syms x y alpha = 45*pi/180; b = cos(alpha);...

3 days ago | 0

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Answered
frequeny domain signal into time domain signal
The ‘outputtransmitterADS.txt’ file has dB as a function of frequency. There are two problems: First: The frequency goes f...

3 days ago | 0

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