How to access data in a cell array

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Auryn_
Auryn_ 2018-5-17
评论： Alexandra Santos 2021-3-16
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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采纳的回答

Sandro Lecci
Sandro Lecci 2018-5-17
Hy Auryn,
myCell{1}(2:60,1) should do the stuff.
Best, Sandro
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Auryn_
Auryn_ 2018-5-17
Hi Sandro,
it works :)
Now, how can I plot it in a 3D plot? I have tried
surf=[1:60-1,1:10,mycell{:}(2:60,1)];
hold on
but it doesn't work :(
Sandro Lecci
Sandro Lecci 2018-5-17
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

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更多回答（2 个）

Image Analyst
Image Analyst 2018-5-17
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 个评论
Auryn_
Auryn_ 2018-5-17
Hi,
thanks for the reply.
I try to plot it now in a 3D plot but I do not know how to do it:
I have tried
surf=[1:60-1,k,mycell{:}(2:60,1)];
hold on
Image Analyst
Image Analyst 2018-5-17
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.

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Alexandra Santos
Alexandra Santos 2021-3-14
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 个评论
Image Analyst
Image Analyst 2021-3-14
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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