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Stephen Cobeldick


5,989 total contributions since 2014

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Answered
Assign values to a string in Matlab
>> X = 'abcaaabc'; >> Y = num2cell(X) Y = 'a' 'b' 'c' 'a' 'a' 'a' 'b' 'c' >> Y1 = X-97 Y1 = ...

1 day ago | 0

Answered
Figures not saving as specific file type regardless of specified extension
Specifying the image file type and specfiying the file extension are two totally different things. Your title "Figures not savin...

1 day ago | 1

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Answered
regexprep does not exactly what I want
>> regexprep(Charge,'^[^-+]*','') ans = '-1' '+0' '+1' '-1' '+0' '+1' >> regexp(Charge,'[-+].+$','once','...

1 day ago | 1

Answered
Values in cell array keep getting overwritten
Much simpler and much more robust: D = 'path to the main directory'; S = dir(fullfile(D,'img*')); for k = 1:numel(S) F =...

1 day ago | 0

Answered
What are variable scopes?
Consider that inside some function you define some variable, e.g.: X = 3; You might then ask yourself, now that I have defined...

1 day ago | 0

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Answered
concatenate structs and then plot a specified column
Simpler without conditional statements: D = 'path to the folder/Dati_Finali'; S = dir(fullfile(D,'*.mat')); b = 1; for k = 1...

1 day ago | 0

Answered
Count the values inside a cell array considering another cell array
>> Rc = vertcat(R{:}); >> Vc = vertcat(V{:}); >> X = ~cellfun('isempty',Rc) & ~cellfun('isempty',Vc); >> F = @(r,v) sum(r(2,v...

1 day ago | 0

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Answered
Saving the values into a mat file error
Rather than this indirect, complex, buggy, obfuscated, strongly inadvisable code: evalstring = sprintf('handles.mystructdata.%s...

1 day ago | 0

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Answered
de2bi not working for large decimal number
"Why is that?" Because those functions use double class, and your value is well above flintmax: >> 2^53 % flintmax ans = 9.00...

1 day ago | 0

Answered
Count how many element are inside each cell af a cell array on the basis of an array
>> C = vertcat(V{:}); >> X = ~cellfun('isempty',C); >> F = @(x)sum(x(2,:)<=80); >> M = zeros(size(C)); >> M(X) = cellfun(F,C...

1 day ago | 0

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Answered
How to subtract two close numbers?
"..i don't know why it doesn't give exact zero." The decimal values 5.4 and 0.4 cannot be represented exactly using binary floa...

1 day ago | 1

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Answered
Find the intersect of two columns from different matrix but keep the corresponding cells from the same row along with the intercept values
>> A = [2,4,6,8,10;2,3,5,3,2] A = 2 4 6 8 10 2 3 5 3 2 >> B = [2,3,5,8,10;1,2,2,2,1] B = ...

2 days ago | 0

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Answered
Alternation without for loop
>> N = min(numel(A),numel(B)); >> V = [reshape([A(1:N);B(1:N)],1,[]),A(N+1:end),B(N+1:end)] V = 1 0.5 2 0.2 3 0.4 4 ...

2 days ago | 1

Answered
Modify a cell array and obtain a new cell array
The problen is that you try to access a row of GGG which does not exist. You define GGG as a 1x2 cell array: GGG= {[...],[...]...

2 days ago | 0

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Answered
Matching closest values to each other
>> [~,idx] = min(abs(bsxfun(@minus,B,A.')),[],2); >> C = [B,A(idx)] C = 39.167 39.342 39.892 39.942 40.592 4...

2 days ago | 0

Answered
finding location of logical 1 row wise by column
[idr,~] = find(yourMatrix)

2 days ago | 0

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Answered
Difference between ' (single quote) vs " (double quote)?
https://www.mathworks.com/help/matlab/characters-and-strings.html In a nutshell: single quotes define a character vector with ...

2 days ago | 0

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Answered
Array vs. Matrix Operations
What "compatible sizes" means is explained on this page: https://www.mathworks.com/help/matlab/matlab_prog/compatible-array-siz...

2 days ago | 0

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Answered
SAVE command: How to specify the variable to be saved if it is a variable inside an array. assignin has been used to create the variable from a string in an array.
save using the structure syntax: S = struct('theNameYouWant',x); save(...,'-struct','S')

3 days ago | 0

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Answered
How to fill NaN values in 3d array using interpolation?
The simple solution is to download this: https://www.mathworks.com/matlabcentral/fileexchange/4551-inpaint_nans

3 days ago | 1

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Answered
how to extract and load images and data from multiple .mat files present in a folder
https://www.mathworks.com/help/matlab/import_export/process-a-sequence-of-files.html D = 'path to the folder where the files ar...

5 days ago | 1

Answered
creating matrix from a vector
>> v = [0,0,4,6] v = 0 0 4 6 >> n = ceil(v/2); >> w = 1:max(n); >> m = bsxfun(@times,v,bsxfun(@le,w(:),n)) m = ...

5 days ago | 1

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Answered
How can I create an input row only excisting randomly only out of -1 and +1?
>> V = [-1,1]; >> X = randi(2,1,23); >> V(X) ans = -1 -1 1 1 1 -1 -1 -1 1 -1 1 -1 1 1 1 -1 1 1 ...

5 days ago | 1

Answered
How to extract a value from mat file
S = load(...) S.Fs

5 days ago | 0

Answered
Calling Matrix that is indexed, in a for loop
The easiest approach is to use a cell array: T{1} = [1,2]; T{2} = [2,3,4]; T{3} = [3,4,5]; T{4} = [3,4,5]; T{5} = [1,5]; f...

5 days ago | 0

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Answered
Question about import a .txt file into matlab
Your code has several issues, the most significant ones are: you incorrectly used the optional third input, apparently to try a...

6 days ago | 1

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Answered
Index for subfolders without *.pdf files
Simpler and more robust: D = 'path to the main folder'; S = dir(fullfile(D,'*')); N = setdiff({S([S.isdir]).name},{'.','..'}...

6 days ago | 2

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Answered
removing NaN values from mat file
load into an output variable (which is a scalar structure), then loop over the fields: https://www.mathworks.com/help/matlab/re...

6 days ago | 2

Answered
fprintf matrix question. Need help.
No loop is required: >> x = 1:8; >> y = exp(x); >> fprintf('The force in link (%d)= %g N\n',[x;y]) The force in link (1)= 2....

6 days ago | 0

Answered
Weird reading data: seed
The problem is data.seed. When you concatenate that numeric value onto character vectors MATLAB does not implcitly convert the ...

6 days ago | 0

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