improve this function in terms of speed

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Salvatore Mazzarino
Salvatore Mazzarino 2012-10-13
In my simulation this function is called many time and I would improve in terms of speed this function so I can earn in execution time this is the function
function [ruffled_head] = ruffle_head(head_rcv)
while 1
ruffled_head = head_rcv(randi(length(head_rcv));
if ruffled_head ~= 0
break;
end
end
end
this function receives a vector that is made of integer values and also zeros. it should return an integer value different from zero. I think that this function could be better.Any idea how to improve?

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采纳的回答

Walter Roberson
Walter Roberson 2012-10-13
t = head_rcv(head_rcv ~= 0);
ruffled_head = t(randi(length(t)));
  1 个评论
Walter Roberson
Walter Roberson 2012-10-13
Note that this will not necessarily be faster than what you had. It depends on the length of the vector, and the occupation percentage. For a large matrix which is well populated, this version will be slower than what you have.

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更多回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2012-10-13
function [ruffled_head] = ruffle_head(head_rcv)
rufled_head=0;
while rufled_head==0
ruffled_head = head_rcv(randi(length(head_rcv)));
end

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