choosing from numbers whose sum is X
1 visualizzazione (ultimi 30 giorni)
Mostra commenti meno recenti
hi all,
suppose i generate 1000 random numbers and want to pick five out of that 1000 so that the sum of the five numbers is 100. if there is no way so the sum equal to 100 then i will just re run it. it doesnt have to work always...thank you!!
0 Commenti
Risposta accettata
Matt Fig
il 11 Set 2012
Modificato: Matt Fig
il 11 Set 2012
I suppose you mean integers, but you don't say....
N = round(randn(1,1000));
S = 0;
maxiter = 2e6;
cnt = 1;
while S~=5 & cnt<maxiter
R = ceil(rand(1,5)*1000);
S = sum(N(R));
cnt = cnt + 1;
end
Now we have the numbers, so look at them:
nums = N(R)
sum(nums)
3 Commenti
Matt Fig
il 11 Set 2012
Modificato: Matt Fig
il 11 Set 2012
What do you mean, no fixed sum? I generated 100 random numbers and chose 5 whos sum is 5. If you need to change it to the sum being 100, then just use:
while S~=100
You might also like a different distribution. So:
N = round(randn(1,1000)*20);
N = randi(100,1,1000); % etc...
Più risposte (1)
Vedere anche
Categorie
Scopri di più su Creating and Concatenating Matrices in Help Center e File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!