With ischar usage - I get two different answers

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Sergio
Sergio 2024-1-23
编辑： Dyuman Joshi 2024-1-23
Hello, I found out that ischar gives two different answers as follows:
ischar("a")
ans =
logical
0
While, with this format, it gives the oppositve answer. Why is that? Thanks
chr = 'a'
chr =
'a'
tf = ischar(chr)
tf =
logical
1

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采纳的回答

Aquatris
Aquatris 2024-1-23
编辑：Aquatris 2024-1-23
Ran in:
"a" is a string not a char. You use double quotes for strings single quote for char.
isstring("a")
ans = logical
1
ischar("a")
ans = logical
0
isstring('a')
ans = logical
0
ischar('a')
ans = logical
1

更多回答（1 个）

Dyuman Joshi
Dyuman Joshi 2024-1-23
编辑：Dyuman Joshi 2024-1-23
Ran in:
"Why is that?"
Because a character array (char) and a string array (string) are different. They are both different data types for text data in MATLAB.
You can see the class of both the variables defined below in the output from whos (which can also be found via class) -
y1 = "a";
y2 = 'a';
whos
Name Size Bytes Class Attributes cmdout 1x33 66 char y1 1x1 150 string y2 1x1 2 char
%y1 is a string array
isstring(y1)
ans = logical
1
%not char array
ischar(y1)
ans = logical
0
%y2 is a char array
ischar(y2)
ans = logical
1
%not a string array
isstring(y2)
ans = logical
0
For more information -
https://in.mathworks.com/help/matlab/matlab_prog/represent-text-with-character-and-string-arrays.html
https://in.mathworks.com/help/matlab/matlab_prog/update-your-code-to-accept-strings.html#mw_7f89d759-1649-4135-bb88-d7ae4dd6f6e4

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