MATLAB中的字符串索引:单引号与双引号 [英] String indexing in MATLAB: single vs. double quote

问题描述

我有一个字符串矩阵，如下所示:

I have a matrix of strings such as the following:

readFiles = [   
            "11221", "09";
            "11222", "13";
            "12821", "06";
            "13521", "02";
            "13522", "13";
            "13711", "05";
            "13921", "01";
            "14521", ".001";
            "15712", ".003"
            ];

这些用于自动访问某些文件夹和文件.然后，我要执行的操作如下( ii 是一些整数):

These are used to access to some folders and files in an automatic way. Then what I want to do is the following (with ii being some integer):

FileName = strcat('../../Datasets/hc-1/d',readFiles(ii,1),'/d',...
                     readFiles(ii,1),readFiles(ii,2),'.dat');
data(ii,:) = LoadBinary(FileName, 6);

然后使用双引号生成字符串 FileName (我不确定为什么).所以它的值是:

The string FileName is then generated using double quotes (I'm not sure why). So its value is:

FileName = 

"../../Datasets/hc-1/d13921/d1392101.dat"

函数 LoadBinary()尝试执行以下操作时返回错误:

The function LoadBinary() returns an error when trying to perform the following operation:

lastdot = strfind(FileName,'.');
FileBase = FileName(1:lastdot(end)-1); % This line 

但是，如果我使用单引号手动创建字符串 FileName ，该函数就可以正常工作.

However, if I create the string FileName manually using single quotes, the function works okay.

简而言之，如果我尝试索引使用上述各行创建的字符串( FileName(1:lastdot(end)-1))(导致 FileName ="../../Datasets/hc-1/d13921/d1392101.dat")，MATLAB返回错误.如果我用单引号( FileName ='../../Datasets/hc-1/d13921/d1392101.dat')手动创建，则该函数正常运行.

In a nutshell, if I try to index a string (FileName(1:lastdot(end)-1)) that is created with the lines above (leading to FileName = "../../Datasets/hc-1/d13921/d1392101.dat"), MATLAB returns an error. If I create it manually with single quotes (FileName = '../../Datasets/hc-1/d13921/d1392101.dat'), the function works right.

为什么会这样?有没有解决的方法(即将双引号字符串转换为单引号字符串)?

Why does this happen? Is there a way to fix it (i.e. convert the double-quoted string into a single-quoted one)?

推荐答案

双引号是String数组，而单引号是Char数组.您可以使用函数 char 将字符串数组转换为char类型.所以你会写:

Double quotes are String array, while Single one are Char array. You can convert your string array to a char one using the function char. So you'd write :

CharFileName = char(FileName)

它应该可以解决您的问题.

And it should resolve your issue.

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