如何动态访问结构字段? [英] How do I access structure fields dynamically?

问题描述

我有一个结构，其中包含许多字段，这些字段是不同长度的向量.我想按顺序访问循环中的字段.我尝试了如下的getfield，但是MATLAB不喜欢这样.我怎样才能做到这一点?

I have a structure with many fields which are vectors of different lengths. I would like to access the fields within a loop, in order. I tried getfield as follows but MATLAB doesn't like that. How can I do this?

S = struct('A', [1 2], 'B',[3 4 5]);
SNames = fieldnames(S);
for loopIndex = 1:2
  field = getfield(S, SNames(loopIndex));
  %do stuff w/ field
end
??? Index exceeds matrix dimensions

我首先使用结构，因为数组在使用不同的字段长度时会遇到麻烦.有更好的替代方法吗?

I'm using structures in the first place because an array would have trouble with the different field lengths. Is there a better alternative to that?

推荐答案

尝试使用动态字段引用，在其中将字符串放在括号中，如在定义 stuff 的行上所示.

Try dynamic field reference where you put a string in the parenthesis as seen on the line defining stuff.

S = struct('A', [1 2], 'B',[3 4 5]); 
SNames = fieldnames(S); 
for loopIndex = 1:numel(SNames) 
    stuff = S.(SNames{loopIndex})
end 

我同意史蒂夫和亚当的观点.使用细胞.但是，此语法适合其他情况下的人！

I concur with Steve and Adam. Use cells. This syntax is right for people in other situations though!

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