How can I remove for loop in the following code that change the entries of a given vector?

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Hassan
Hassan 2018-1-7
编辑： Matt J 2018-1-7
Hello, I am trying to vectorize the following simple code
if true
A=[-1;3;0;-4];
B=zeros(size(A));
for i=1:4
if A(i)<0
B(i)=-(A(i));
elseif A(i)==0
B(i)=1;
else
B(i)=A(i);
end
B=B(:);
end
end
Please, how do I write the above code in such a way that there is no for loop, and still it works?

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采纳的回答

Star Strider
Star Strider 2018-1-7
Try this:
A=[-1;3;-2;-4];
B = A;
B(A<0) = -A(A<0)
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Star Strider
Star Strider 2018-1-7
Note that it is necessary to determine the number of zeros, so the vector of non-zero values that replaces them is the same size. I used random single-digit positive integers, although any vector with the same number of non-zero values as there are zero values in the vector will work.

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更多回答（1 个）

Matt J
Matt J 2018-1-7
编辑：Matt J 2018-1-7
B=abs(A);
B(~A)=1; %or any other value

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