Selecting arbitrary sequence of rows from a matrix

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gujax 2018-10-29

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https://ww2.mathworks.cn/matlabcentral/answers/426703-selecting-arbitrary-sequence-of-rows-from-a-matrix

编辑： gujax 2018-10-29

A=100000x1 made of numbers <3000 : A=[2345,123,4000, etc...]

B=5000x100000 an array of numbers given;

Select A out of B(:,1) for each of 100000 columns.

i.e., make a new cell array out of B picking out 2345x100000; 123x100000; 4000x100000 etc elements

Thanks

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Bruno Luong 2018-10-29

You'll hard time to store them on your poor PC.

gujax 2018-10-29

编辑：gujax 2018-10-29

Sorry, KSSV, yes 4000 is incorrect. It should be < 3000. And it should be picked up in the sequence as in A. I will have hard time storing this but the size of A is actually 5000 . I can split B in steps of 50000 columns.. I worked out something using indexing finally. Unless someone has better ideas. I will post my solution once I check it works.

Another problem I faced is that because of indexing method I had to use cumsum. The integers blew up where it reached int32 limit. Now I have to declare everything uint64. I am afraid some math later may blow this up on me. Don't know what is the best way to handle this.

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