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

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!

Answer 1

[Star Strider]

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

.

Answer 2

[KALYAN ACHARJYA]

C=B.*(A.*B>0)