string - 如何在MATLAB中将字符串拆分为字母？

Question

我有一个文本，我想把它变成一个分隔字母的数组。例如。：

'hello world' → ['h','e','l','l','o',' ','w','o','r','l','d']

谢谢。

ps MATLAB 2013a

Answer 1

Your original question does not make much sense; a string already is an array of characters.

Building on the assumption the others here have taken (that you want a cell array of individual characters), there is this slightly shorter alternative:

>> num2cell('hello world')
ans = 
   'h'    'e'    'l'    'l'    'o'    ' '    'w'    'o'    'r'    'l'    'd'

Another way:

>> regexp('hello world', '.', 'match')
ans = 
   'h'    'e'    'l'    'l'    'o'    ' '    'w'    'o'    'r'    'l'    'd'

You can also take a look at strsplit (introduced in R2013a or so)

num2cell preserves the class of the input argument, as seen in the relevant section in num2cell:

c = cell(size(a));
for i=1:numel(a)
    c{i} = a(i);
end 

The basics: under the hood, a string (== array of chars) is essentially an array of 8-bit integers, interpreted a different way. Type 'hello world'+0 to see what I mean; you'll get the UTF-8 table values of the individual characters in an array of integers (well, doubles, but oh well).

Answer 2

在许多方面，字符串 'hello world' 是一个分隔的字母数组。也许您正在寻找一个元胞数组，其中每个元素都是一个标量字符

x = mat2cell('hello world', 1, ones(11, 1))

x = 

    'h'    'e'    'l'    'l'    'o'    ' '    'w'    'o'    'r'    'l'    'd'

Answer 3

据我了解，字符串本质上是一个字符数组，所以没有什么可做的：

>> str = 'hello world'
str = hello world
>> str(1)
ans = h
>> str(2)
ans = e
>> str(3)
ans = l