How to reference previous value in an array without a for loop?
조회 수: 4 (최근 30일)
이전 댓글 표시
Hi,
I have a for loop set up following a similar structure to this:
for i=2:size(data,1)
data.Var3(i)=interp1(ref_data.x,ref_data.y,data.Var2(i))-interp1(ref_data.x,ref_data.y,data.Var2(i-1));
end
Where I use a reference table to interpolate a certain x value from my current data to obtain a corresponding y value, that is done twice per row.
It works, but the data table I'm using has 300,000 rows, so the run time of this loop alone is just under 3 mins in my case (data.Var3 is not being resized after every iteration in the loop).
Doing this operation this way simply takes too long, is there any way you can think of in which I can carry out the operation inside the for loop, without actually putting it inside a loop?
Any help is appreciated,
Thanks!
댓글 수: 0
채택된 답변
Wan Ji
2021년 8월 24일
use i=2:size(data,1); data.Var3(i)=interp1(ref_data.x,ref_data.y,data.Var2(i))-interp1(ref_data.x,ref_data.y,data.Var2(i-1));
추가 답변 (0개)
참고 항목
카테고리
Help Center 및 File Exchange에서 Loops and Conditional Statements에 대해 자세히 알아보기
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!