Zero out values ​​from a specific row in a matrix

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Lev Mihailov
Lev Mihailov 2022-2-24
评论： Jan 2022-2-24
I create a matrix, I need to reset all values ​​​​above or below a certain line
c = randi([50 90],1,900); % rows in the matrix before or after which you need to reset everything
x = rand(100,900);
I would appreciate any help
  1 个评论
Jan
Jan 2022-2-24
Does "reset" means, to set the value to 0? A small example with inputs and output would clarify this.

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DGM
DGM 2022-2-24
Ran in:
Depends if you want before or after. Since there's no specified mechanism to determine which, I'm assuming they're separate cases.
% a smaller array
sz = [10 10];
c = randi(round([0.5 0.9]*sz(1)),1,sz(2))
c = 1×10
5 5 8 8 7 6 5 7 7 7
x = rand(sz);
% above
xa = zeros(sz);
for col = 1:sz(2)
xa(c(col):end,col) = x(c(col):end,col);
end
xa
xa = 10×10
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0.6705 0.3275 0 0 0 0 0.8203 0 0 0 0.3977 0.2444 0 0 0 0.2563 0.6388 0 0 0 0.3504 0.4670 0 0 0.8608 0.6775 0.7311 0.6058 0.9829 0.5098 0.2348 0.4727 0.5051 0.7958 0.2300 0.5589 0.2007 0.7440 0.6406 0.1086 0.3023 0.2689 0.6540 0.5244 0.9616 0.0880 0.9428 0.1761 0.6237 0.5623 0.7242 0.2876 0.3713 0.6931 0.6045 0.1354 0.0207 0.3005 0.6675 0.9878
% below
xb = zeros(sz);
for col = 1:sz(2)
xb(1:c(col),col) = x(1:c(col),col);
end
xb
xb = 10×10
0.2351 0.8935 0.6577 0.1085 0.7050 0.7653 0.5715 0.1200 0.3469 0.8277 0.8900 0.0832 0.3699 0.4257 0.3712 0.8449 0.8821 0.3460 0.0425 0.6749 0.7048 0.9170 0.8989 0.5342 0.1087 0.4904 0.3728 0.1454 0.6048 0.0438 0.9782 0.3588 0.9342 0.3823 0.5303 0.7890 0.3342 0.0637 0.2030 0.5178 0.6705 0.3275 0.4531 0.0285 0.0355 0.8376 0.8203 0.1705 0.6936 0.4366 0 0 0.6351 0.0355 0.8810 0.2563 0 0.7491 0.8071 0.5694 0 0 0.1182 0.9483 0.8608 0 0 0.6058 0.9829 0.5098 0 0 0.5051 0.7958 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0

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