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

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Enrico Gambini
Enrico Gambini 2021-3-5
编辑： Stephen23 2021-3-6
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

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Jorg Woehl
Jorg Woehl 2021-3-5
编辑：Jorg Woehl 2021-3-6
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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Jorg Woehl
Jorg Woehl 2021-3-5
I see - in this case, using the any function like you suggested would be the way to go. Test if at least one element of v is greater than zero and then increase the count variable accordingly:
if (any(v>0)) % returns true if at least one element of v is greater than zero
count=count+1;
end

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