For loop within for loop

조회 수: 34(최근 30일)
DARLINGTON ETAJE
DARLINGTON ETAJE 2019년 8월 8일
답변: Jos (10584) 2019년 8월 9일
Please help me out. This code isn't working...
qq=8:10008;
for m = 1:9
for n = 1:10001
A(m, n) = (m+n)+qq;
end
end
I just want answer for A
  댓글 수: 3
Alex Mcaulley
Alex Mcaulley 2019년 8월 9일
You can do it without loop. For example:
qq = 8:10008;
n = 1:10001;
m = 1:9;
[X,Y] = meshgrid(qq + n,m)
A = X + Y;
If you use the loops, at least preallocate your array A to minimize the execution time:
qq = 8:10008;
A = zeros(9,10001);
for m = 1:9
for n = 1:10001
A(m, n) = (m+n)+qq(n);
end
end

댓글을 달려면 로그인하십시오.

답변(1개)

Jos (10584)
Jos (10584) 2019년 8월 9일
In recent ML versions there is no need for meshgrid or so. The plus syntax will expand the vectors :-)
% a smaller example
n = 1:11
m = 1:4
q = 8:18
A = m' + n + q

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by