how to generalize a nested for-loop?2

1 次查看（过去 30 天）

显示更早的评论

Mnr 2015-11-2

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/252250-how-to-generalize-a-nested-for-loop-2

编辑： Image Analyst 2015-11-4

Hello all,

Per my earlier question in http://www.mathworks.com/matlabcentral/answers/252008-a-simpler-way-of-doing-a-nested-loop

Is there a way to generalize that nested loop so that it works for any sizes of h1? Thank you.

回答（2 个）

Walter Roberson 2015-11-2

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/252250-how-to-generalize-a-nested-for-loop-2#answer_198132

在 MATLAB Online 中打开

coeffs = [0.3, 0.2, 0.5, 0.8, 0.1, 0.75];  %for example
V = [1+1i +1-1i -1+1i -1-1i];
n = length(coeffs);
[Vg{1:n}] = ndgrid(V);
Vm = cell2mat( cellfun(@(C) C(:), Vg, 'Uniform', 0) );
t_h1 = Vm * coeffs(:);
h1 = reshape(t_h1, length(V) * ones(1,n));
clear n Vg Vm t_h1

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Mnr 2015-11-2

编辑：Image Analyst 2015-11-4

It works for any sizes of coeffs! Thank you!

请先登录，再进行评论。

Stephen23 2015-11-2

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/252250-how-to-generalize-a-nested-for-loop-2#answer_198177

在 MATLAB Online 中打开

@Mnr: try this:

V = [1+1i,+1-1i,-1+1i,-1-1i];
W = [0.3,0.2,0.5,0.8];
N = numel(V);
X = cell(1,N);
[X{:}] = ndgrid(V);
Y = cat(N+1,X{:});
S = [ones(1,N),N];
Z = sum(bsxfun(@times,reshape(W,S),Y),N+1);

I checked again and deleted my comment few minutes after I typed it. I do not know why it is still shown to you. Thank you, they are equal and your method is fantastic. Is there a way to accept both the two answers?