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

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Yasyas9
Yasyas9 2020-6-30
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
Adam Danz 2020-6-30
编辑：Adam Danz 2020-6-30
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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Reeshabh Kumar Ranjan
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
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
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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