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Vectorising a loop so does not contain any loops

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nc
nc 2016-10-25
评论： Rena Berman 2017-1-20
Hi I have trouble vectorising a loop, currently I am stuck making the arrarys the same value, any help please?
for n = 1:100
for m = 1:100
A(n,m) = n^3 +m;
if A(n,m)<130
A(n,m)=3*A(n,m);
end
end
end
x = 1:100;
y = 1:100;
[X,Y] = meshgrid(x,y);
F = X.^3 + Y ;
F = 3*(F(F<130)); % trouble is here
disp(F);
isequal(A,F);

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回答（1 个）

Matt J
Matt J 2016-10-25
I=F<130;
F(I) = 3*F(I);

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