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Stephen Cobeldick


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6 604 total contributions since 2014

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Answered
Matching unequal cell arrays
Using tables: >> TA = cell2table(A(:)) TA = Var1 ____ 124 252 252 1252 225 225 ...

ungefär 10 timmar ago | 0

Answered
Assign a number of random elements to different variables?
Using one cell array is much better than having lots of separate variables, so that is what this answer does. >> v = randperm(4...

ungefär 11 timmar ago | 1

Answered
Nested tables with duplicate sub-column names?
The link you gave is unrelated to nested tables: the goal there was to (in some way) merge multiple tables into one table. It i...

en dag ago | 0

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Answered
Average of multiple cell arrays
Assuming that each cell contains a 1x22051 vector (i.e. they are all the same size): avg_ydft = mean(cat(3,ydft{:}),3) https:/...

en dag ago | 0

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Answered
How to sum the second poation data in an array (50000x2) with the same value in the first position
Method one: accumarray: >> [U,~,G] = uniquetol(A(:,1)); >> S = accumarray(G(:),A(:,2)); >> M = [U,S] M = 2.79314 0.141...

en dag ago | 0

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Answered
read csv. convert char-array to matrix
Because MATLAB does not handle UCS-2 file I first converted your file to UTF-8 (attached). This imports all of the main matrix ...

2 dagar ago | 0

Answered
Help with printing output
Instead of adding spaces manually you can set the fieldwidth: hours = [13,22,41]; x = [74.52,30.02,22.68]; y = [77.40,36.30,2...

3 dagar ago | 0

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Answered
Access all k-th elements of a n-dimensional array, where the k indexes are defined in a (n-1)-dimensional array.
>> S = size(A); >> [R,C,~] = ndgrid(1:S(1),1:S(2),1); >> X = sub2ind(S,R,C,idx); >> B = A(X) B = 1 11 3 13 ...

3 dagar ago | 0

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Answered
For loop using bin2dec conversion
This is MATLAB, you don't need a for loop! Method one: mtimes: >> V = [1,1,0,1,0,0,1,0]; >> N = 2; >> X = pow2(N-1:-1:0)*res...

6 dagar ago | 0

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Answered
Matrix Generation from Other Matrices
F = @(p)C*A^p*B; M = arrayfun(F,0:n-1,'uni',0); M = cumsum(cat(3,M{:}),3); M = reshape(permute(M,[1,3,2]),[],b); Tested: >>...

6 dagar ago | 0

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Answered
Replacing NaN's in column of a Matrix
Where M is your matrix: X = isnan(M(:,2)); M(X,2) = 250;

6 dagar ago | 1

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Answered
For loop goes longer than expected.
"Can you help me what is the cause for this behaviour?" Because that is the indexing that you used. You defined the loop itera...

7 dagar ago | 0

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Answered
Average of the nine surrounding cells
Use conv2 to calculate the averages, e.g.: out = matrix2.*conv2(matrix1,ones(3,3),'same')/9;

7 dagar ago | 1

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Answered
How to separate an array into 3
>> A = [11,22,33,44,55,66,77,88,99]; >> B = A(1:2:end-1) B = 11 33 55 77 >> C = A(2:2:end-1) C = 22 44 66 88...

7 dagar ago | 1

Answered
modify the matrix, rearrangement of elements
>> a = [2,4,7,11;7,9,5,54;2,5,7,9;12,41,45,21] a = 2 4 7 11 7 9 5 54 2 5 7 ...

8 dagar ago | 1

Answered
How can I create a new cell array from an existing one?
Country = strrep(Country,'"','')

8 dagar ago | 0

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Answered
Numerical error representing data in Format Long
"I have had a surprise making with this simple multiplication:" Nothing in that result is surprising. "The result must be 8.2e...

8 dagar ago | 1

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Answered
Is it possible to determine within a function the location of that function?
https://www.mathworks.com/help/matlab/ref/mfilename.html p = mfilename('fullpath') [p,n] = fileparts(p)

9 dagar ago | 0

Answered
How to list files in the directory
https://www.mathworks.com/help/matlab/ref/dir.html D = 'absolute/relative path to where the files are saved'; S = dir(fullfile...

9 dagar ago | 0

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Answered
Concatenate same fields in multiple structures in a loop using field names
Because all of the structures contain the same fieldnames they should be stored as one non-scalar structure: https://www.mathwo...

9 dagar ago | 0

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Answered
How to generate all combinations of N struct vectors.
It is much simpler when those structures are stored in one cell array, e.g.: C{1}(1).a = 5; C{1}(2).a = 9; C{2}(1).b = 2; C{...

9 dagar ago | 0

Answered
Call to function with multiple outputs
[~,y2] = f(x) https://www.mathworks.com/help/matlab/matlab_prog/ignore-function-outputs.html

10 dagar ago | 0

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Answered
Saving previous values in a function to use them within it
https://www.mathworks.com/help/matlab/ref/persistent.html

10 dagar ago | 0

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Answered
Sort Data by Second Column
Use sortrows, e.g. where M is your matrix: M = sortrows(M,2); If you really want to use sort, then of course you will need to ...

10 dagar ago | 0

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Answered
how to plot a vector
"what's wrong with my code?" you preallocate a variable named Vho which you never use again. inside the loop you allocate to a...

12 dagar ago | 1

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Answered
Error : Undefined variable
You incorrectly transcribed the error message: the actual character shown is lower-case L, i.e. l, not a 1 like you showed. To a...

12 dagar ago | 0

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Answered
Suppressing ans in a function
To avoid the ans you must use a semi-colon when you call the function: str = encrypt(...); % ^ you need this s...

13 dagar ago | 0

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Answered
I keep getting two answers for my code
fconvg = int(k*j, x, 0, t) % ^ missing semi-colon This line should probably come after the if-end. Th...

13 dagar ago | 0

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Answered
Solving linear system 2 equations, 2 unknowns, not A = b*C form
Using a numeric solver or the symbolic toolbox is like using a sledge-hammer to crack open a tiny walnut! It is very simple to ...

13 dagar ago | 0

Answered
Button Colors and Shapes in GUIDE
http://undocumentedmatlab.com/articles/modifying-matlab-look-and-feel https://www.mathworks.com/matlabcentral/fileexchange/4086...

13 dagar ago | 0

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