How to replace a for loop that contains an if statement?

Question

gsourop 2021-2-1

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/733028-how-to-replace-a-for-loop-that-contains-an-if-statement

编辑： Star Strider 2021-2-1

采纳的回答： Star Strider

在 MATLAB Online 中打开

Dear everyone,

I have 2 vectors with random numbers

A = -5 + (5+5)*rand(10,1);
B = -5 + (5+5)*rand(10,1);

and based on the sign of each pair, I want to create a third vector ('C') that will get the respective value of B, if A(i)*B(i)>0 and zero, otherwise. Is there any better way to employ this rather than using a for loop, such as:

for i = 1:10
   if A(i)*B(i)>0
       C(i) = B(i);
   else
       C(i) = 0;
   end
end

A solution on the basis of not creating a third vector ('C') and overwritting B is also welcome, such as

for i = 1:10
   if A(i)*B(i)<0
       B(i) = 0;
   end
end

Thank you in advance!

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Answer 1

Star Strider 2021-2-1

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/733028-how-to-replace-a-for-loop-that-contains-an-if-statement#answer_611838

编辑：Star Strider 2021-2-1

在 MATLAB Online 中打开

One of these should do what you want:

A = -5 + (5+5)*rand(10,1);
B = -5 + (5+5)*rand(10,1);
LogicalReference = (A.*B)>0;                    % Logical Vector
DesiredResult = LogicalReference.*B;            % Either Will Work Here

.