How can I select n numbers from a large data that equals the given average?
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For Example: I have a data of rand(1000) numbers. I want to pick the 10 numbers that satisfy the average 47. And provided, only one set of 10 numbers from the group will satisfy the average 47. How can I do this? Is there any Matlab function for this?
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Daniel Shub
el 7 de Ag. de 2012
The RAND function returns a random number between 0 and 1. It is not possible to take 10 of those numbers that will average 47. Even if you scale the output of RAND, the numbers are floating point so the odds of finding a solution that exactly equals 47 is essentially zero. You need to tell us more about the data and what to do if the answer is not exactly 47 and ideally how close to 47 we need to get.
Respuesta aceptada
Azzi Abdelmalek
el 7 de Ag. de 2012
a=rand(1000,1)*100; % a your array
c= combnk(a,10);
b=mean(c,2)-47
[i,j]=min(abs(b))
samples=c(j,:) % the result
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Andrei Bobrov
el 7 de Ag. de 2012
variant
A = randi(4e6,1000);
[d,ii] = sort(A(:));
B = conv(d,.1*ones(10,1),'same');
i1 = find(B <= 47,1,'last');
out = A(sort(ii(i1 + (-4:5))));
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