how to break up a huge matrix at a specific different rows breakpoints into several smaller matrices
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I have a huge matrix that I need to sort and break up into smaller matrices, now given that we know the indcies of the rows where we should split the matrix and we alrady have these indecies stored somewhere in another matrix how can we break the matrix effeciently at those specific breakpoints into several smaller matrices?
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Chunru
il 13 Set 2021
For the sake of saving space of the large matrix, try to directly access to the submatrix, instead of reproducing the submatrices, if it is possible.
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Walter Roberson
il 13 Set 2021
In the case where the indices indicate the beginnings of the new blocks:
TheMatrix = randi(9, 15, 2)
split_indices = sort(1 + randperm(14,2)) %beginnings of blocks
blk = diff([1 reshape(split_indices, 1, []) size(TheMatrix,1)+1]);
splits = mat2cell(TheMatrix, blk, size(TheMatrix,2))
celldisp(splits)
3 Commenti
Walter Roberson
il 13 Set 2021
In your actual code, make split_indices the indices of the starts of each new section. Do not include index 1 or the index of the end of the block, just the internal indices. Then use the assignment to blk and the assignment to splits .
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