Extracting and formatting data

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Doina Gumeniuc 2017-11-19

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https://ww2.mathworks.cn/matlabcentral/answers/367961-extracting-and-formatting-data

评论： Doina Gumeniuc 2017-11-26

采纳的回答： Walter Roberson

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Hi all,I am trying to do the following: Let's say I have two matrices

Every value from matrix A represents the number of values I would like to extract from matrix B. For example: if the first value in matrix A is 2, then I would like to extract first two values from B in a row [0.1,0.003] and so on.

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Rik 2017-11-20

And how did you want to save those different parts?

Doina Gumeniuc 2017-11-21

Hi Rik! I will fprint them into a vtk input file. In B I have numerous columns so I would like to take it column by column using the same values from A

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Walter Roberson 2017-11-20

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B_cell = mat2cell(B, A, size(B,2));

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Walter Roberson 2017-11-26

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B_cell = mat2cell(B, A, ones(1,size(B,2)));

Doina Gumeniuc 2017-11-26

wow..Great, thank you a lot!

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Rik 2017-11-19

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A solution that might not scale well, is to convert A to a cell (with num2cell), use cellfun with @(x) 1:x, make sure it is a row array, convert back to a normal vector (with cell2mat) and use that as the index to B (so C=B(index_vector);)