用名称在Matlab循环中变化的矩阵加载do操作 [英] Load an do operations with a matrix whose name varies within a Matlab loop

问题描述

我必须运行一个以 x 索引的Matlab循环.在每次迭代中，我必须加载并使用数组 A_x.mat ，其中下标 x 跟随循环索引.我怎样才能做到这一点?让我给你和例子来突出我的问题.这个例子很愚蠢，但符合我的目的.

I have to run a Matlab loop indexed by x. At each iteration, I have to load and work with an array, A_x.mat, where the subscript x follows the loop index. How can I do that? Let me give you and example to highlight my issue. The example is very silly but serves my purposes.

X=10;
C=cell(X,1)
for x=1:X
    load(['A_' num2str(x) '.mat']); %here I load A_x.mat
    %C{x}=A_x*3;
end

我不知道如何以允许下标 x 变化的方式计算 A_x * 3 .你能建议吗?

I don't know how to compute A_x*3 in a way that allows the subscript x to vary. Could you advise?

为了解决我的问题，我也尝试过

To solve my issue I also tried

   for x=1:X
        B=load(['A_' num2str(x) '.mat']); %here I load A_x.mat and "rename" it B
        %C{x}=B*3;
    end

但是 B 原来是一个带有1个字段的 1x1 结构，该字段又是 A_x .因此，我什么都没解决.

but B turns out to be a 1x1 struct with 1 field that is again A_x. Hence, I have not solved anything.

推荐答案

您可以将结构子字段名称另存为char并直接使用它访问结构:

You can save the structure subfield name as a char and access the structure with it directly:

X=10;
C=cell(X,1)
for x=1:X
    name = ['A_', num2str(x)];
    data_structure = load([name, '.mat']); %here I load A_x.mat
    C{x} = data_structure.(name) * 3;
end

请注意，您可以使用eval()实现类似的功能，但不建议这样做.如果您需要像这样动态访问变量，请使用结构.

Note that you could achieve something similar with eval() but that is not recommended. If ever you need to access variables dynamically like this, use a structure.

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