How to extract data from all matrixes of a cell array?

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Yasyas9 2020-6-30

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编辑： Stephen23 2022-9-14

I have a cell array 1x23 and every matrix contains 1x921600 and they're all same size but i only need to extract data from all the matrixes from array 1 until 456000 and again from 456000 until 764500. how can i do that ?

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Adam Danz 2020-6-30

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编辑：Adam Danz 2020-6-30

在 MATLAB Online 中打开

For cell array "C"

newArray = cellfun(@(a){{a(1,1:456000);a(1,456000:764500)}},C);
newArray = [newArray{:}]; 

newArray is a 2xn cell array of row vectors where row 1, newArray(1,:), are the values 1:456000 and row 2, newArray(2,:), are values 456000:764500

newArray =
  2×23 cell array
  Columns 1 through 3
    {1×456000 double}    {1×456000 double}    {1×456000 double}  . . . . .
    {1×308501 double}    {1×308501 double}    {1×308501 double}  . . . . . 

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Yasyas9 2020-6-30

Thank you so much yes that's exactly what i wanted

Adam Danz 2020-6-30

Glad I could help.

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Reeshabh Kumar Ranjan 2020-6-30

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By extracting data, I assume you mean accessing the elements. This seems more of a syntax question.

Let's say you have a cell array

ca = {[1 2 3], [4 5 6], [7, 8, 9]}

Now, you can just loop over it

for i = 1 : length(ca)
    matrix = ca{i}
    % you have the matrix in each iteration now, access its elements any way you like
end

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Evangelia Tripoliti 2022-9-14

This is partly true. What if you have 100 matrices in a cell array? will you name the individually?

Stephen23 2022-9-14

编辑：Stephen23 2022-9-14

"This is partly true."

Exactly which part is untrue?

"What if you have 100 matrices in a cell array?"

As stated in my previous comment, I would use simple and efficient indexing into the cell array. This is not just a hypothetical situation, I do this very often (e.g. processing TB of data in thousands of files).

"will you name the individually?"

No.

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