Stephen Cobeldick

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6,939 total contributions since 2014

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Answered
A loop for sorting tables
tblA = sortrows(Table1,{'Variable','Value'}); for k = 1:40 % or whatever the max 'variable' is. vnm = sprintf('Variable %d...

8 hours ago | 0

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I there a way to call variables from my workspace into the genetic algorithm tool? (Without calling them from the fitness function)
"Is it possible to have variables in my fitness function (data.Die and data.DiePD in my case) that are in my worspace without ha...

17 hours ago | 1

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using a value to find index in a matrix?
The simplest solution is to simply check for equality: idx = x==Matrix_A; which will return a logical array with true in every...

1 day ago | 0

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Extract unknown number of vectors from matrix
" num2cell would create separated cells with the n vectors of size, but sub2ind also does not run on cells." True, but you can ...

1 day ago | 0

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code to load my files from folder, add workspace variable and save to another folder
You don't need to load the file data, you can use save's '-append' option: fs = 128; for ... loop over all files, you need to ...

1 day ago | 1

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exceeded number of array elements
Ru is scalar, but in multiple locations you try to access Ru(2), e.g.: for u = 1:2 xX{u} = @(Beta) Ru(u)*cos(Beta) + sqrt( R^2...

1 day ago | 1

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How to replace every non-0 number with the number in that place added to another number - no loops
I think it is neater to only define the index once: >> X = A~=0; >> A(X) = A(X)+B A = -6 0 -4 -3 -2 0 1 0 ...

1 day ago | 0

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Error "too many output argument" in function
"How should I do to fix the error?" If you want a function to return an output then the it must be defined in the function decl...

1 day ago | 0

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pass string variable to a function in uicontrol callback
Define the function to accept five input arguments: function correctAnswer(hCorrectAns,EventData,num1,randomVector,string1) an...

1 day ago | 0

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how do i plot til some x one function and then other
x = 0:0.1:20; y = min(12,x); plot(x,y,'-+') In a more general case, use logical indexing, e.g.: x = 0:0.1:20; y = x; y(y...

1 day ago | 1

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Index exceeds the number of array elements (1).
Your define angulo as a scalar (i.e. size 1x1): angulo= 15; and then a few lines later with i=2 you try to access its 2nd elem...

1 day ago | 0

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Inputting the function Sin(2x)Cos^2(0.5x)
x = linspace(0,2*pi,50); y = sin(2*x).*cos(0.5*x).^2; plot(x,y)

2 days ago | 0

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Plot a variable within a function
"How should I plot Ca vs W curve after function has been evaluated" Return the required variables as the 2nd, 3rd, etc. functio...

2 days ago | 0

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Invalid data type - converting to cell array to run functions
In both cases your code nests a cell array inside a cell array: dff{i} = num2cell(tot_dff(1,f_i(i):f_o(i))); % ^^^^^^...

2 days ago | 1

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Using an integral in a function
The problem is that in the "main file" you did not declare q_Max and f_1 as global. But rather than using global variables (whi...

3 days ago | 0

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Doubt about plotting in Matlab and finding intersect points
"...if I plot the circle with the lines, the circle deforms to an oval" axis('equal') https://www.mathworks.com/help/matlab/re...

3 days ago | 0

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I am trying to write a recursive code to check whether a string is palindrome or not, when i am running a trial case a error message shows up stating "he function call palindrome('madam') caused an error and did not complete (MATLAB:TooManyOutputs)".
If you want to return an output argument then it must be declared in the function, e.g.: function out = palindrome(v) if l...

3 days ago | 0

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how to load saved workspace in a custom named variable?
The efficient approach is to use indexing (rather than anti-pattern dynamic variable names): https://www.mathworks.com/help/mat...

3 days ago | 1

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converting abbreviation of months to numerical value
ismember makes this easy: >> D = {'mar','apr','nov','may'}; % your data >> C = {'jan','feb','mar','apr','may','jun','jul','aug...

3 days ago | 0

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how do I create a loop for to extract doubles variables from a cell array?
Where raster_data is your cell array: for k = 1:numel(filenames) raster_labels = raster_data{k}; ... the rest of your...

3 days ago | 0

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Extracting data from a table that has cells in cells
>> S(1).date = '20200120'; >> S(2).date = '20200120'; >> S(1).id = 1; >> S(2).id = 2; >> S(1).action = [0;0;0;1;0]; >> S(2)...

3 days ago | 1

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Split array of sensor data by indexing
S = load('matlab.mat'); T = S.Data.IMU; G = findgroups(T.name); C = arrayfun(@(g)T(g==G,:),1:max(G),'uni',0); You can then t...

3 days ago | 1

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What code is it?
"Is there someone recognize the following code..." It isn't code, it is a binary .mat file (just as the text at the start of th...

4 days ago | 0

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store for loop outcomes in matrix
With MATLAB it is generally much better to loop over indices (rather than over data values), then you can simply use those indic...

4 days ago | 0

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Importing and Organizing Text File Data
This efficiently reads all of the file data into one structure. [fid,msg] = fopen('Example_File.txt','rt'); assert(fid>=3,msg...

4 days ago | 0

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Variable 'KD' is not fully defined on some execution paths
Look at this line of code KD_anterior=KD; and now consider what is the value of KD the second time the function is called. The...

4 days ago | 0

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How to select or group sections of an array without using indexing
>> A = [NaN, NaN, NaN, NaN, 2, 3, 6, 7, NaN, NaN, NaN, NaN, NaN, 4, 6, 8, 8, NaN, NaN, NaN, NaN]; >> X = diff([true,isnan(A),tr...

4 days ago | 0

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Answered
Assign values of .mat files into matrix
D = 'path to the folder where the files are saved'; S = dir(fullfile(D,'silomodresults*.mat')); C = {}; for k = 1:numel(S) ...

4 days ago | 0

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Answered
Splitting an array up
Just use mat2cell, no need for reshape: >> M = rand(64,92690); % fake data >> N = 2048; >> S = size(M); >> V = repmat(N,1,fi...

4 days ago | 2

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Subtraction inside a cell array
You will have to get the numeric data out of the cell array before performing any numeric operations on it. Although you did no...

5 days ago | 0