how to break up a huge matrix at a specific different rows breakpoints into several smaller matrices
1 Ansicht (letzte 30 Tage)
Ältere Kommentare anzeigen
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?
4 Kommentare
Chunru
am 13 Sep. 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.
Akzeptierte Antwort
Walter Roberson
am 13 Sep. 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 Kommentare
Walter Roberson
am 13 Sep. 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 .
Weitere Antworten (0)
Siehe auch
Kategorien
Mehr zu Matrices and Arrays finden Sie in Help Center und File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!