带零填充数字的 Matlab 文件名 [英] Matlab file name with zero-padded numbers

问题描述

我有 11x11 矩阵，我将它们保存为 .mat 文件，从 F01_01 到 F11_11.我必须在每个文件上运行一个函数 Func.由于时间长，想写个脚本自动运行函数:

I have 11x11 matrices and I saved them as .mat files from F01_01 to F11_11. I have to run a function Func on each file. Since it takes a long time, I want to write a script to run the function automatically:

for i=01:11  
    for j=01:11  
        filename=['F',num2str(i), '_', num2str(j),'.mat'];  
        load(filename);  
        Func(Fi_j);   % run the function for each file  Fi_j  
    end  
end  

但它不起作用，Matlab 找不到 mat 文件.
有人可以帮忙吗?

But it doesn't work, Matlab cannot find the mat-files.
Could somebody please help ?

推荐答案

问题

i=01; 
j=01; 
['F',num2str(i), '_', num2str(j),'.mat']

评估为

F1_1.mat

而不是

F01_01.mat

正如预期的那样.

这样做的原因是 i=01 是双类型赋值，i 等于 1 - 没有前导零这些类型的变量.

The reason for this is that i=01 is a double type assignment and i equals to 1 - there are no leading zeros for these types of variables.

该问题的可能解决方案是

a possible solution for the problem would be

for ii = 1:11
    for jj= 1:11
        filename = sprintf('F_%02d_%02d.mat', ii, jj );
        load(filename);  
        Func(Fi_j);   % run the function for each file  Fi_j  
     end  
end

几条评论:

1. 注意使用 sprintf 格式化双 ii 和 jj 使用 %02d.

1. Note the use of sprintf to format the double ii and jj with leading zero using %02d.

你可以使用num2str<的第二个参数/code> 格式化其输出，例如:num2str(ii,'%02d').

You can use the second argument of num2str to format its output, e.g.: num2str(ii,'%02d').

使用字符串格式 处理字符串时的工具.

It is a good practice to use string formatting tools when dealing with strings.

matlab 中更好的做法 不要使用i和j作为循环计数器，因为它们在matlab中的默认值为sqrt(-1).

It is a better practice in matlab not to use i and j as loop counters, since their default value in matlab is sqrt(-1).

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