How to select numbers?

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Pari
Pari 2019-7-17
回答： Pari 2019-7-17
F=rand(400) M=rand(400) How can i select F<M ?

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Pari
Pari 2019-7-17

Thanks dear friends My problem solved with index :)

更多回答（2 个）

infinity
infinity 2019-7-17
Hello,
You can simply type
F = rand(3)
M = rand(3)
result = F(F<M)
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Pari
Pari 2019-7-17
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
infinity 2019-7-17
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)" ?

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Jan
Jan 2019-7-17
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))

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