How to select numbers?

F=rand(400) M=rand(400) How can i select F<M ?

Answer 1

[Pari]

Thanks dear friends My problem solved with index :)

Answer 2

[infinity]

Hello,

You can simply type

F = rand(3)
M = rand(3)
result = F(F<M)

[Pari]

Thank you Actually i should select numbers with this condition and put them in a function! I test your answer but i didnot get my result

[infinity]

Hello,

To solve your actual problem, you should provide more description of it.

[Pari]

My code: F=rand(1,400); M=rand(1,400); Tf=log(-F)/.73; Tm=log(-M)/1.2; I should select Tm<Tf and sum these numbers for A= sum(Tm)/sum(Tf)

[infinity]

Hello,

What do you mean when compare Tm and Tf when each element of them are complex number?

Assume when we obtain element of Tm that smaller than Tf, what do you mean by

"sum these numbers for A= sum(Tm)/sum(Tf)" ?

Answer 3

[Jan]

F  = rand(1,400);
M  = rand(1,400);
Tf = log(-F) / 0.73;
Tm = log(-M) / 1.2;

It is hard to guess, what this means: "I should select Tm<Tf and sum these numbers for A= sum(Tm)/sum(Tf)". Perhaps:

index = (Tm < Tf);
A = sum(Tm(index)) / sum(Tf(index))