improve this function in terms of speed

조회 수: 3 (최근 30일)
Salvatore Mazzarino
Salvatore Mazzarino 2012년 10월 13일
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?

채택된 답변

Walter Roberson
Walter Roberson 2012년 10월 13일
t = head_rcv(head_rcv ~= 0);
ruffled_head = t(randi(length(t)));
  댓글 수: 1
Walter Roberson
Walter Roberson 2012년 10월 13일
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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추가 답변 (1개)

Azzi Abdelmalek
Azzi Abdelmalek 2012년 10월 13일
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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