Count if a vector has at list one element greater than zero
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Enrico Gambini
el 5 de Mzo. de 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
Respuesta aceptada
Jorg Woehl
el 5 de Mzo. de 2021
Editada: Jorg Woehl
el 6 de Mzo. de 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.)
3 comentarios
Jorg Woehl
el 5 de Mzo. de 2021
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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