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Stephen23


Active since 2014

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  • Most Accepted 2023
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Answered
Change date from cell to number inside array
" How do I change it from a cell to a numeric format I can use?" Use the correct type of indexing: if itin_full{1,6}>=0.9 % ...

13 hours ago | 0

Answered
help using bsxfun to multiplay different size matrixes
tmp = bsxfun(@times, norm_mode, reshape(fields(:,3),1,1,[]))

2 days ago | 0

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Answered
Bar() very thin, does not respond to width argument
"I have a problem with Bar() function" No, you have a problem with ZEROS() function. In particular you have only specified ZERO...

4 days ago | 0

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Answered
How to validate that one datetime is greater than another
Do NOT convert to low-precision serial date numbers! Avoid deprecated DATENUM ! Argument validation lets you define your own va...

5 days ago | 1

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Answered
Matrix does not want to multiply and gives an error when I multiply a 3x3 matrix with a 3x1 matrix
Read the INV documentation! And then use the recommended function MLDIVIDE: A = [9, 29.3, 140.99; 29.3, 140.99,827.693; 140.99,...

6 days ago | 0

Answered
alternative of inline function
If you want a derivative, why are you using a function handle? Using symbolic toolbox would be simpler: syms x f = x^2-2*x g ...

7 days ago | 1

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Answered
Find minimum values based on unique number
P = load('matlab.mat').Prof_temp S = groupsummary(P,"Profile_num","min","Temp") plot(S.Profile_num,S.min_Temp)

7 days ago | 0

Answered
Spli cell array directly at the function output
If you can modify the function to return another output argument the size of the returned cell arrays is only known when they ...

7 days ago | 0

Answered
How to fix loop which over the determined index ?
"Hi guys, im trying to do looping ii 1:900 but why when u run it, it was never-ending loop." I already told you the reason why,...

7 days ago | 0

Answered
Duration type doesn't preserve seconds accuracy
"Duration type doesn't preserve seconds accuracy" That is exactly what CALENDARDURATION objects are for: format longg dt1 = d...

8 days ago | 0

Answered
Find min and max in groups
A = [12, 11, 12, 5, 3, 10, 5]; B = [0.1, 0.1, 0.1, 0.7, 0.4, 0.3, 0.2]; X = 1:numel(A); Fmax = @(x){x(max(B(x))==B(x))}; Fmi...

8 days ago | 0

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Answered
Use save function with '-fromstruct' option to save a cell array
As the error message states, the structure must be scalar: test_file = 'test.mat'; files = {'test1.m', 'test2.m'}; T = ones(1...

8 days ago | 2

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Answered
How to write to csv file in shortG format?
Here is one approach that gives exactly the shortG format in your CSV file: format long G M = rand(3,5); M(1) = -6.0247123456...

14 days ago | 1

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Answered
I need help with an error I get
Perhaps the input argument should be F (not f): function [posicao, velocidade, aceleracao] = atleta(t, F, M)

17 days ago | 1

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Answered
When multiplying or dividing a vector by a scaler, when do you need a period before the operator?
"When multiplying or dividing a vector by a scaler, when do you need a period before the operator?" Lets consider multiplying. ...

17 days ago | 0

Answered
Observations being read as number of columns instead of rows
Perhaps because the data are (complex conjugate) transposed here: 'ValidationData', {stan_x_val', stan_y_val'}, Note that yo...

17 days ago | 1

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Answered
Need help figuring out why this nested function is not working
"File not found" You are not providing FOPEN and READMATRIX with the filepath, so they cannot find the file on your computer. P...

17 days ago | 0

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Answered
Can't seem to replace values in matrix meeting criteria, although the correct row,col coordinates are found
Use SUB2IND: idx = sub2ind(size(img),row,col); img(idx) = 1; The section "Indexing Matrices with Two Subscripts" here: https...

19 days ago | 0

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Answered
Compare two files and remove any lines in the second file when they match values found in the first file
lines1 = [1,2,3,4;2,4,6,7;2,5,7,8;6,7,4,6] lines2 = [2,4,6,7;2,5,7,8] out = setdiff(lines1,lines2,'rows')

19 days ago | 0

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Answered
A more efficient or compact way to sort strings that contain dates
a = [... '123_abc_01_202403020000_202403022359.txt'; '123_abc_01_202403040000_202403042359.txt'; '123_abc_01_2024...

20 days ago | 1

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Answered
Portion of code containing my custom functions is hidden and I cant access it.
The feature is called code folding: https://www.mathworks.com/help/matlab/matlab_prog/edit-and-format-code.html#brazeg3-1 http...

20 days ago | 1

Answered
How can I access the value of a string variable? I need to construct a file path from a string variable, but keep getting the variable name and not the string.
It works perfectly, exactly as you showed in your question: directory_name = "directory1"; f = fullfile('/Users/me/ch4', direc...

21 days ago | 1

Answered
Appending data when extracting nested fields as individual variables
The simple and efficient MATLAB approach using two comma-separated lists (no loops are required!): first100 = load('frames.mat'...

21 days ago | 0

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Answered
char array to numeric array
"I was wondering if there was a better way of doing this?" Of course, use READTABLE (or READMATRIX): unzip tab_file_table.zip ...

22 days ago | 0

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Answered
I'm trying to convert the text into binary and then i want to make the 4 bits chunks.
message = 'Hello world'; A = dec2bin(message, 8) B = reshape(A.',1,[])

22 days ago | 0

Answered
How to stop double printing text using sprintf ?
Problems: 1- This is the relevant code: VariantModel = compose('%d', 1:height(VariantIDPassed)); .. writefile(VariantModel{i...

23 days ago | 0

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Answered
How do I fix my Nan issue within a recursive function?
Replace this (which returns logical indices): FirstID = M==-1; with this (which returns the linear index): FirstID = find(M==...

23 days ago | 0

Answered
How to import multiple .mat files to workspace?
The basic problem is that you are not supplying the filepath to LOAD. You can improve your code as well. I am guessing that you...

24 days ago | 0

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Answered
Error in code, parenthesis perceiving as comment for some reason
Explanation: for some reason you seem to be running this literal code: Q_est = updateQ(...) instead of calling UPDATEQ etc. wi...

24 days ago | 1

Answered
smart function to switch functions
You could use STR2FUNC: str = 'ode23'; odesolver = str2func(str); odesolver(@fun,..) or simply use FEVAL: feval(str,@fun,.....

24 days ago | 0

| accepted

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