How to access data in a cell array
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Auryn_
le 17 Mai 2018
Commenté : Alexandra Santos
le 16 Mar 2021
Hi,
I have a cell array of 1x10 where each of the 10 arrays are matrices of 80x31. If I want to access the data of each of the cells but just (2:60,1), how can I access it?
I tried with mycell{1,[2:60,1]} but it doesn't work.
Any help will be very much appreciated.
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Réponse acceptée
Sandro Lecci
le 17 Mai 2018
Hy Auryn,
myCell{1}(2:60,1) should do the stuff.
Best, Sandro
5 commentaires
Sandro Lecci
le 17 Mai 2018
I suggest you have a look at the documentation of the surf function, type doc surf in the command window to see how to use this function.
You need to provide the X, Y and Z coordinates of the surface you want to plot --> surf(X,Y,Z).
Considering your case I would extract all the lines of interest (from 2 to 60, column one, from all cells) and create a new matrix that contains them, then plot the matrix using the surf function using the correct syntaxis.
We are now off topic with respect to the main question (which was solved).
Good luck, Sandro
Plus de réponses (2)
Image Analyst
le 17 Mai 2018
Try this. Say you're in a loop over k
for k = 1 : length(mycell)
% Extract the k'th cell's contents.
thisCellContents = mycell{k}; % Will be a 80x31 array.
subArray = thisCellContents(2:60, 1); % Extract columns 2-60 of column 1
% Now do something with subarray.....
end
2 commentaires
Image Analyst
le 17 Mai 2018
surf() is a function. You don't assign anything TO it. That will blow away the surf() function. Bad idea. You CALL the surf() function by passing your data INTO it. See the help.
Alexandra Santos
le 14 Mar 2021
I had a similar question but maybe commenting here may be better. Does anyone know how to append array data within within the cell array? I.e. If you were to access your matrix within the cell array and wanted to add a vector to it.
Thanks.
2 commentaires
Image Analyst
le 14 Mar 2021
index = 5; % Whatever cell you want to deal with
ca{index} = [ca{index}, yourVector]; % For row vectors. Or use semicolon if they're column vectors.
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