# Exrapolate values from cell matrix and operations with cell elements

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EldaEbrithil am 14 Okt. 2020
Kommentiert: Ameer Hamza am 15 Okt. 2020
Hi all
i have a cell matrix where each cell is nx3 double. Assuming you have the coordinates ( [y k] where y and k are arrays )of the cells that interest me, I want, from these selected cells, to extrapolate only the first of the three columns.
How can be done?
Thank you for the help
Regards
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### Akzeptierte Antwort

Ameer Hamza am 14 Okt. 2020
Bearbeitet: Ameer Hamza am 14 Okt. 2020
I am not sure about the point related to extrapolation. If you just want to extract the first column of selected cells, then you can try this
C; % cell matrix
y; % row index of selected cells
k; % column index of selected cells
idx = sub2idx(size(C), y, k);
C_selected = C(idx);
first_columns = cellfun(@(x) {x(:,1)}, C_selected);
if all columns have same length then you can create a matrix
first_columns = [first_columns{:}];
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EldaEbrithil am 15 Okt. 2020
Thanks you very much Ameer!!
I have also another question: consider two array A and B with the same number of cell. Each cell has different length, i want to perform operations with the elements content inside each cell so which of the following expressions is better?
C{i}=A{i}/{B{i}
C{i}=A{i}./{B{i}
C{:,i}=A{:,i}./{B{:,i}
Ameer Hamza am 15 Okt. 2020
It depends on what you are trying to do. / is used for "matrix division", whereas ./ is used for element-wise division. If corresponding cells of A and B have an equal number of elements, then I think you want to use
C{i}=A{i}./{B{i}

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