how velocize it? (vectorize it)

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aldo
aldo 2023-10-8
编辑： aldo 2023-10-8
Ran in:
a=magic(8)
a = 8×8
64 2 3 61 60 6 7 57 9 55 54 12 13 51 50 16 17 47 46 20 21 43 42 24 40 26 27 37 36 30 31 33 32 34 35 29 28 38 39 25 41 23 22 44 45 19 18 48 49 15 14 52 53 11 10 56 8 58 59 5 4 62 63 1
b=[1 3 2 4 5 5 8 3] % (b is always >0)
b = 1×8
1 3 2 4 5 5 8 3
[~,c]=size(a);
B=a;
for i=1:c
if b(i)>1
B(1:b(i)-1,i)=0;
end
end
B
B = 8×8
64 0 0 0 0 0 0 0 9 0 54 0 0 0 0 0 17 47 46 0 0 0 0 24 40 26 27 37 0 0 0 33 32 34 35 29 28 38 0 25 41 23 22 44 45 19 0 48 49 15 14 52 53 11 0 56 8 58 59 5 4 62 63 1

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采纳的回答

Bruno Luong
Bruno Luong 2023-10-8
Ran in:
a=magic(8)
a = 8×8
64 2 3 61 60 6 7 57 9 55 54 12 13 51 50 16 17 47 46 20 21 43 42 24 40 26 27 37 36 30 31 33 32 34 35 29 28 38 39 25 41 23 22 44 45 19 18 48 49 15 14 52 53 11 10 56 8 58 59 5 4 62 63 1
b=[1 3 2 4 5 5 8 3] % (b is always >0)
b = 1×8
1 3 2 4 5 5 8 3
B = a.* ((1:size(a,1))' >= b)
B = 8×8
64 0 0 0 0 0 0 0 9 0 54 0 0 0 0 0 17 47 46 0 0 0 0 24 40 26 27 37 0 0 0 33 32 34 35 29 28 38 0 25 41 23 22 44 45 19 0 48 49 15 14 52 53 11 0 56 8 58 59 5 4 62 63 1

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