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Stephen Cobeldick


5,581 total contributions since 2014

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Answered
how to loop through subfolders and apply a particular function
A simple function which correctly handles special characters in the pattern and actually calls the nested function recursively: ...

3 days ago | 0

Answered
replacing uiget with pathname and filename
You use dir without any specific name+wildcards, so it will return all contents of that folder (i.e. files and folders). You the...

3 days ago | 1

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finding the right values for a vector
Use mrdivide: >> V = (1:15).'; >> a = pi; >> M = a/V M = 0.0025335 0.0050671 0.0076006 0.0101342 0.0126677 0.0...

3 days ago | 1

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get the value of element from matrix
Simply use ismember and basic MATLAB indexing: >> [X,Y] = ismember(B,A(:,1:2),'rows'); >> Z = A(Y(X),:) Z = 9 9 ...

4 days ago | 0

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Finding corresponding values in double arrays in structure fields
Note that these methods assume that there is exactly one match per row. If this is not the case, then there is no way to disting...

5 days ago | 2

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filling a matrix with a loop
"Does anyone know how to do this?" This is simple and efficient with toeplitz: >> C = [1,zeros(1,399)]; >> R = [1,1,0,1,zeros...

6 days ago | 3

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anyway to translate this command using 'cellfun'
Note that it is simpler to use strfind: >> C = strfind(test,'_'); >> C{:} ans = 2 ans = 2

6 days ago | 0

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Create a matrix with random integers between 1 and 9
>> reshape(randperm(9),3,3) ans = 6 8 2 3 5 4 7 1 9

6 days ago | 0

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Meaning imaginary result of asin(x) function of MATLAB
"'My question is how can we interpret this imaginary number? Does it have any meaning? Yes, it has a meaning. Why does MATLAB ...

7 days ago | 1

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What `gcbf` stands for?
gcbf get callback figure gcbo get callback object These are not necessarily the current ones.

7 days ago | 1

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Sorting columns of cell Array
Either download my FEX submission natsort: https://www.mathworks.com/matlabcentral/fileexchange/34464-customizable-natural-orde...

7 days ago | 1

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the problem of using 'case'
Your first (inadvisable, numerically fragile, should-be-avoided) concept works for me: for omega = 0.1:0.1:2; switch omega ...

8 days ago | 1

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Answered
Search a matrix combined with logical indexing
>> A = [3,10,2,5;2,14,5,3] A = 3 10 2 5 2 14 5 3 >> N = 10; >> B = A.*(cumsum(A>N,2)>0) B = 0...

9 days ago | 0

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Storing multiple value in array without overriding.
"How to avoid that?" Simply by changing the Excel worksheet name on each iteration of the outer loop, e.g.: ... for z=1:nfile...

10 days ago | 0

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How to create a for loop through a directory for only certain folders in the directory
An efficient MATLAB solution: P = 'absolute/relative path to the parent directory Sample'; S = dir(fullfile(P,'sub*')); F = {...

10 days ago | 0

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How can I make an array of structs , each struct have a unique index?
"How can I make an array of structs , each struct have a unique index?" Easily: https://www.mathworks.com/help/matlab/matlab_pr...

10 days ago | 0

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Regular Expressions using regexp
Matching only integer numbers after 'UZK' or 'T_' (it is unclear in your question if the underscore is permitted or not, but the...

10 days ago | 1

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How to read elements from a computed matrix without define a new variable?
MATLAB does not allow indexing into the results of operations. You can either use a temporary variable (which is probably the mo...

10 days ago | 0

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Answered
Matrix Maipulation and adding from variables in the workspace
Load the file into a variable (which is a structure) and access its fieldnames: S = load(...)

10 days ago | 0

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ERROR-The statement cannot be reached
Those warnings are very simple to understand by aligning the code and looking at the values. MATLAB warns you that lines 14 and...

11 days ago | 2

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Using semicolon for input argument when working with a matrix function
" I was thinking concatination, concatinating the same matrix 4 times but multiplying it by 1,2,3, then 4 as requested." It wou...

11 days ago | 1

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Comma separated value to vector
>> S = '11,333,4445,2,78,2399'; >> V = sscanf(S,'%f,',[1,Inf]) V = 11 333 4445 2 ...

11 days ago | 0

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Answered
Replacing individual Values in Data column based on a condition
idx = myData.fluid_p_rel<0.9 | myData.fluid_p_rel>1.2; myData.fluid_p_rel(idx) = 1

11 days ago | 0

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How to convert column datetime to datenum?
It is not clear from your example what class data has: a table or a non-scalar structure or .. ? In any case, datetime objects ...

12 days ago | 1

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Error when calling a function : "Dimensions of arrays being concatenated are not consistent."
The full error message is this: Error using vertcat Dimensions of matrices being concatenated are not consistent. Error in fu...

12 days ago | 2

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Counting zeros in array
Simpler: >> V = [1,-2,-1,-1,-1,0,0,-1,0,0,0,3,0,0,4,0,0,0,0,0]; >> X = find([V(1:end-1),1]); >> Z = [diff([1,X+1])-1;V(X)].' ...

13 days ago | 3

Answered
Converting binary like table but using decimal values
You can use comma-separated lists on the output of ndgrid: https://www.mathworks.com/help/matlab/matlab_prog/comma-separated-li...

13 days ago | 0

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Answered
How do i compare cell array values and replace with string of code letters?
Method one: >> C = {'UUU','CUU','UUC','UUG'}; >> F = {'UUU','UUC'}; >> L = {'UUA','UUG','CUU','CUC','CUA','CUG'}; >> Xf = is...

13 days ago | 0

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Answered
How to get nearest values in matrix and save indexes of these values?
>> X = [5,10,15]; >> Y = 0:7/5:30; >> [~,Z] = min(abs(X-Y(:))) % the indices of the closest values: Z = 5 8 12 ...

14 days ago | 2

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Answered
Operation on structure fields with common part of the field name
S.DUT_2 = 2; S.REF_2 = 3; S.DUT_4 = 4; S.REF_4 = 5; C = fieldnames(S); U = unique(regexp(C,'\d+$','once','match')) F = @(n...

14 days ago | 0

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