Stephen Cobeldick

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6 840 total contributions since 2014

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Answered
Transposing 5x5x5 matrix
new = permute(r,[2,1,3])

1 jour ago | 0

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Answered
how to clip column into vectors with the rules I set
>> [~,~,idx] = unique(floor(A(:,1)/10)); >> out = accumarray(idx,A(:,2),[],@(v){v}); >> out{1} ans = 0.3000 0.8000 ...

1 jour ago | 2

Answered
Floor function with a space giving an array output
Your example uses command syntax, which is explained here: https://www.mathworks.com/help/matlab/matlab_prog/command-vs-functio...

1 jour ago | 0

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How to perform logical AND on intervals of contiguous locations
"I need to vectorize it to make it run faster (I am working with huge arrays)" Using accumarray should be reasonably efficient:...

2 jours ago | 0

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How to interpret entries in documentation's left pane
"What do the entries below that represent?" They list all other page headings that are at the same level in the current Content...

2 jours ago | 1

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Answered
How to use regexp to extract data?
>> tdata = {'XX__TG';'GB_TH';'BN__TH'}; >> spl = regexp(tdata,'_+','split'); >> spl = vertcat(spl{:}); >> out1 = spl(:,1) ou...

2 jours ago | 0

Answered
Why am I warned about defining variables in a nested function, when I don't?
So far no one has actually explained the warning, which is a pity because this is really quite an interesting question. Some an...

2 jours ago | 3

Answered
How do I swap the elements in the major diagonal with those in the minor diagonal?
Similar to madhan ravi's answer, without sorting: >> x = [1,2,3,4,5;6,7,8,9,1;2,3,4,5,6;7,8,9,1,2] x = 1 2 3 4 5 ...

3 jours ago | 2

Answered
Removing the max and min of a vector without removing multiple minimums or maximums
[~,Sx] = min(a1); % Shortest Link [~,Lx] = max(a1); % Longest Link a2 = a1; a2([Sx,Lx]) = [] And tested using the values tha...

3 jours ago | 1

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Answered
How to import data with exotic delimiters.
Using textscan's optional arguments properly avoids awkward reshaping of the output (and you have more flexibility because you c...

3 jours ago | 0

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How to save multiple text files with same name, but with incrementing numbers
"The function I'm using, writetable, requires to specify the filename between apostrophes..." Actually the writetable documenta...

4 jours ago | 0

Answered
Automatically naming mat files with variable names
The cause of your difficulties lies in the unfortunate design decision to force meta-data into the variable names. Meta-data is ...

4 jours ago | 1

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Answered
How can I merge rows into one with the same ID number?
Assuming that the non-diagonal values are exactly zero, then you could use varfun something like this: >> T = cell2table({'A',1...

4 jours ago | 0

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Storing the generated matrices from a for loop into cell arrays and access them later to multiply them altogether
No cell array required: >> x = [2,5,23]; >> A = [9,8;7,6]; >> [n,n] = size(A); >> M = 1; >> for k=numel(x):-1:1; M = M*(A-x...

7 jours ago | 0

Answered
Example got removed from the mathworks website
Unfortunately the Wayback Machine did not seem to have a copy of it, but it was still available in Google Cache, so I saved you ...

8 jours ago | 1

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Answered
Substitute string to double
>> A = {'0+1/R1','0-1/R1','1';'0-1/R1','0+1/R1+1/R2','0';'1','0','0'}; >> A = strrep(A,'R1','1000'); >> A = strrep(A,'R2','100...

8 jours ago | 0

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Answered
i want to write a code where equation is y=x*x. if y=100 what is the value of x?
>> f = @(x) x.^2 - 100; >> x = fzero(f,pi) x = 10

8 jours ago | 0

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Answered
delete column from matrix
Where M is your matrix: M = M(:,24:24:end)

9 jours ago | 0

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Answered
How can I differentiate between powermod(a,b,c) and mod(a^b,c)
>> 104^45 ans = 5.8412e+90 is well above flintmax, so it is very unlikely to exactly represent the integer that you think ...

9 jours ago | 0

Answered
matrix creation from a loop
The simplest and most efficient solution is to just create one matrix: lat = zeros(6964,60) which you can then trivially acces...

9 jours ago | 1

Answered
How can I index a 3D array like A(n,m,:) and get the result as a 1D array?
B = reshape(A(2,3,:),1,[])

9 jours ago | 0

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Answered
How to attribute a letter to unique combinaisons
There does not seem to be a convenient way to apply a function to table groups that does not also accumulate the results (e.g. l...

9 jours ago | 0

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Answered
How can I pass a anonymous function as an output to another function?
"Looks likes I am not allowed to do that . I would like to know how this can be achieved" Your attempted code has several bugs ...

9 jours ago | 0

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Answered
image a set of matrix variables after loading them in
Do not use load. Assign the imported data to an array, e.g.: theFiles(k).data = readmatrix(fullFileName); Now all of your impo...

9 jours ago | 1

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Answered
adding and subtracting elements in the same row in an nested for loop
"My assumption is that I have to do this using a nested for loop." Using array operations would be a much better use of MATLAB,...

9 jours ago | 0

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Answered
How can I sort a matrix to match another matrix?
>> [~,idx] = sort(B); >> [~,idx(idx)] = sort(A(:,2)); >> A = A(idx,:) A = 11 1 21 2 12 1 31 3 ...

10 jours ago | 1

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Answered
Maximization of a Function
The syntax .. = -@(..) is not valid for multiple reasons: the output of @ is a function handle. Arithmetic operations are no...

10 jours ago | 1

Answered
How can I make multiple vectors the same length?
Because each of the input columns has their own domain, you will have to loop over the columns and interpolate each column separ...

10 jours ago | 1

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Answered
How do I read multiple float values in different columns from a txt-File with headers?
You can simply use any of the high-level file importing commands that your version of MATLAB supports, e.g. readtable, readmatri...

10 jours ago | 1

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Answered
Finding specific number of characters in vector
>> c = 'aryzbuk'; >> nnz(c~='b' & c~='r') ans = 5

10 jours ago | 0