how to vectrorized this code?

Question

0 个投票

close all
clear all
clc
tic;
i=1;
for k=1:1:10;
    for a=1:1:10;
         nump(i,:) =k*a;
        denp(i,:) =[1 a 0];
   i=i+1;
      end
end

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

Answer 1

Jan 2017-10-9

编辑：Jan 2017-10-9

0 个投票

nump = (1:10) .* (1:10).'; % Auto-Expand >= Matlab R2016b

For older Matlab versions:

nump = bsxfun(@times, (1:10), (1:10).');

denp from KL's solution is perfect already. This is 2 microseconds(!) faster on my computer, but less nice:

denp       = zeros(100, 3);
denp(:, 1) = 1;
denp(:, 2) = repmat((1:10)', 10, 1);

Answer 2

KL 2017-10-9

1 个投票

nump = cell2mat(arrayfun(@(x) x:x:x*10,1:10,'uni',0))';
denp = [ones(100,1) repmat((1:10)',10,1), zeros(100,1)];

Jan 2017-10-9

+1 for the optimal creation of denp.