Count if a vector has at list one element greater than zero

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Enrico Gambini
Enrico Gambini on 5 Mar 2021
Edited: Stephen on 6 Mar 2021
Hello everyone, I'm looking for a way to update a count if a vector has at least one element greater than zero.
I mean for example:
count=0;
v=rand(100,1);
%check if v has at least one element greater than zero, if yes
count=count+1;
Thank you
  1 Comment
Enrico Gambini
Enrico Gambini on 5 Mar 2021
I think i got a part of the answer
if(any(v)) %returns true if any of the elements of v is nonzero
count=count+1;
end

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Accepted Answer

Jorg Woehl
Jorg Woehl on 5 Mar 2021
Edited: Jorg Woehl on 6 Mar 2021
count = sum(v>0)
The expression v>0 creates a logical array of 1s and 0s, with a 1 for every element of v that is greater than zero. Summing all values in the logical array therefore gives the total number of elements greater than zero.
(By the way, the rand function only generates positive numbers between 0 and 1, so to create random numbers between -1 and 1, you would use 1-2*rand.)
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