How to extract element of all matrices within a cell array using cellfun?
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NS
am 6 Dez. 2018
Kommentiert: Image Analyst
am 16 Apr. 2023
I need to extract (2,1) i.e. second row and first column element of all matrices within cell array ?
0 Kommentare
Akzeptierte Antwort
Image Analyst
am 6 Dez. 2018
Are all the matrices in the cells the same size? If so, just use cell2mat() and indexing:
[rows, columns] = size(ca{1})
m = cell2mat(ca)
m21 = m(2:rows:end, 1:columns:end)
5 Kommentare
Image Analyst
am 7 Dez. 2018
Of course, you could always use a simple for loop:
output = ones(1, numel(ca));
for k = 1 : numel(ca)
thisCellsContents = ca{k}; % Extract this one particular cell
output(k) = thisCellsContents(2, 1);
end
Weitere Antworten (2)
Jos (10584)
am 6 Dez. 2018
This looks like homework to me. Here is a big hint:
Create a function that extracts this for you and use cellfun to apply it to all cells ...
MyFun = @(M) M(...)
5 Kommentare
James Tursa
am 6 Dez. 2018
Bearbeitet: James Tursa
am 6 Dez. 2018
The value of the (2,1) element makes no differrence to indexing ... whether it is finite or inf or NaN. You will not get an "index exceeds" error just because the element is NaN. You get the error because there is no (2,1) element. You need to re-check your matrices. What do you get when you run this:
C = your cell array of matrices
min(cellfun(@numel,C))
min(cellfun(@(c)size(c,1),C))
Ali Nik
am 16 Apr. 2023
Hi I want to use all nested arrays inside each cell. Thank you for your help His photo is attached.
1 Kommentar
Image Analyst
am 16 Apr. 2023
Not sure how this is an answer to @NS. And when you said "His photo is attached", we're not sure what photo you're talking about or where it is. Certainly NS's photo is not attached to your Answer.
If you have your own question, start a new question and attach your cell array in a .mat file after you read this:
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