How to access data in a cell array

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.

[MANOGNA POTLURI]

try mycell{1}( data you want to access)

Answer 1

[Sandro Lecci]

Hy Auryn,

myCell{1}(2:60,1) should do the stuff.

Best, Sandro

[Auryn_]

It works but only for myCell{1}(2:60,1), if I want the second one myCell{2}(2:60,1) it shows the same :(

[Image Analyst]

My answer (below) works for all/any cells in your cell array. Did you see it?

[Sandro Lecci]

Try accessing the cell like this:

myCell{1,1}(2:60,1); %and
myCell{1,2}(2:60,1);

Sandro

edit: Are you sure that your cell don't have the same values in the portion you are interested in?

[Auryn_]

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]

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

Answer 2

[Image Analyst]

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

[Auryn_]

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]

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.

Answer 3

[Alexandra Santos]

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.

[Image Analyst]

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.

[Alexandra Santos]

Thank you !!!!