Speeding up nested for-loop

2 次查看（过去 30 天）

Niles Martinsen 2015-8-24

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/235875-speeding-up-nested-for-loop

评论： Star Strider 2015-8-24

I have the following nested for-loop, containing some if-statements. It is running horribly slow, so I would be very happy to get some hints and tricks to speed it up. Can I vectorize it somehow? Or use parallel computing?

for xi= 1:N
    for yi= 1:N
          a  = A(:,xi,yi);   %a is a vector
          b  = B(:,xi,yi);   %b is a vector
          D  = a-b;
          if( max(D./a)<1e-3 )
              test_var=2.0;  
          else
              F_min = F(a, b, 0); %F is a script I wrote
              F_max = F(a, b, 1); %F is a script I wrote
              if( F_min*F_max>0.0 )
                  test_var=2.0;
              else
                  test_var = F(a, b, 2);
              end
          end
          var(1, xi,yi) = test_var;
      end
  end

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Star Strider 2015-8-24

It might help if you describe what you want to do in your code, the sizes of ‘A’ and ‘B’ (although they are likely equal), and listed ‘F’ and describe what it does.

请先登录，再进行评论。

请先登录，再回答此问题。