Removing specific elements from vector

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Miroslav Mitev
Miroslav Mitev 2017-11-20
评论： Miroslav Mitev 2017-11-20
I have an exponentially distributed vector "F" with "M" values. I need to remove "K" amount of values from "F" starting from the smallest values and I also need the vectors "a" and "a_d" that gives the values of "F" and "F_d" in descending order, respectively.
Everything works fine with my code, but I want "F_d" to be vector with "N" values, instead it gives me "M" values and on the "K" positions that I want to remove it puts Zeros. I know I can just remove the Zeros, but how can I make it work properly?
M=32;
K=1;
N=M-K;
F=exprnd(1,1,M);
[a, index] = sort(F,'descend');
a_d=a(1:end-K);
F_d(index(1:N))=a_d;

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KL
KL 2017-11-20
编辑：KL 2017-11-20
Your question is not very clear. First you're defining, M,K,N and F,
M=32;
K=1;
N=M-K;
F=exprnd(1,1,M);
Now you want to remove K elements from F starting smallest. But what is F_d? is it the sorted F in descending order? If so,
[F_d, index] = sort(F,'descend');
If you want to remove K elements from F, but the smallest ones, then,
F = F_d(index(1:N));
Now if you also want to remove K elements,
F_d = F_d(1:N);
now what is a and a_d? The values of F and F_d are stored in F and F_d.
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Miroslav Mitev
Miroslav Mitev 2017-11-20
It is not what I was looking for. Anyway, thank you for your effort, I fixed the problem by myself. I accept your answer.

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