Replace loop with more efficient procedure to make it faster
조회 수: 1 (최근 30일)
이전 댓글 표시
So I'm running this loop:
for n = 1:size(table1)
for m = 1:size(table2)
if table1.WP1(n) == table2.WP1(m) && table1.WP2(n) == table2.WP2(m)
table2.STOPS(n) = table2.STOPS(m);
end
end
end
Which takes really long to process - is there a faster way to do it?
댓글 수: 0
채택된 답변
Fangjun Jiang
2021년 8월 19일
Would this give you a clue?
t1=1:3;
t2=(1:4)';
flag=(t1==t2)
댓글 수: 9
Fangjun Jiang
2021년 8월 20일
The code I provided is for multiple matching. All can be done in one shot without loops.
If you know there is only one match, the double-for loop could be faster. Your need to use "break" (instead of "continue") to break the loop.
But again, it "could" be faster. If the matching one is the last iteration in the double-for loop, then the "break" has no effect.
Peter Perkins
2021년 9월 2일
The double loop is unlikely to be faster for any case. If there is at most one match in table2 for each row of table1, then perhaps ismember would work. But unless these tables are pretty big, the "row == col" strategy is likely to be the fastest.
추가 답변 (0개)
참고 항목
카테고리
Help Center 및 File Exchange에서 Matrix Indexing에 대해 자세히 알아보기
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!