在MATLAB中的字符串的每一行中添加一个子字符串 [英] Adding a substring to each line in a string in MATLAB

问题描述

假设我在MATLAB中的变量中有一个字符串，如下所示:

Say I have a string in a variable in MATLAB like the following:

this is the first line 
this is the second line 
this is the third line

我想在每行的开头添加一个固定的字符串.例如:

I would like to add a fixed string at the beginning of each line. For example:

add_substring(input_string, 'add_this. ') 

将输出:

add_this. this is the first line 
add_this. this is the second line 
add_this. this is the third line

我知道我可以通过遍历输入字符串来做到这一点，但是我正在寻找一种更紧凑的(希望是矢量化的)方式来实现这一点，也许使用诸如arrayfun accumarray之类的MATLAB内置函数之一.

I know I can do this by looping through the input string, but I am looking for a more compact (hopefully vectorized) way to do this, perhaps using one of MATLAB built-ins such as arrayfun accumarray.

推荐答案

strcat函数就是您所需要的.它确实对字符串进行向量化连接.

The strcat function is what you're looking for. It does vectorized concatenation of strings.

strs = {
    'this is the first line'
    'this is the second line'
    'this is the third line'
    }
strcat({'add_this. '}, strs)

使用strcat时，您需要将'add_this. '放入单元格({})中，以防止其尾部的空白被删除，这是strcat对于char输入的正常行为.

With strcat, you need to put 'add_this. ' in a cell ({}) to protect it from having its trailing whitespace stripped, which is strcat's normal behavior for char inputs.

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