Single-byte characters?

Question

Lipa 2011-5-24

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/8091-single-byte-characters

Hi!

If I understand correctly, characters in Matlab are always defined as two-byte variables? Is it possible to define a single-byte character?

I'm trying to communicate with an external device, and I need to send it a character string of N bytes = N characters. At the moment, however, when I define my string in Matlab I always get 2*N bytes.

Is it possible to create strings of characters where each character is stored as one byte?

Thanks!

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Patrick Kalita 2011-5-24

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/8091-single-byte-characters#answer_11121

在 MATLAB Online 中打开

Does this work for you?

>> s = uint8('hello world')
s =
    104  101  108  108  111   32  119  111  114  108  100
>> whos
  Name      Size            Bytes  Class    Attributes
    s         1x11               11  uint8              
>>

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

John D'Errico 2011-5-24

And of course, char(s) recovers the characters themselves.

请先登录，再进行评论。

Answer 2

Jan 2011-5-24

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/8091-single-byte-characters#answer_11164

If the function expects a CHAR, you must provide 2-byte characters. 1-byte characters are simply not CHARs and will be refused by the called function.

Please post any details about the program used for "communication with an external device".

0 个评论
显示 -2更早的评论隐藏 -2更早的评论

请先登录，再进行评论。

Answer 3

Lipa 2011-5-24

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/8091-single-byte-characters#answer_11131

Thanks for the reply. I tried what you suggested before, but the problem is that my external function that I'm calling requiers a character string as input. I know that generally (single-byte) "char" should be the same as "uint8", but this doesn't seem to be the case in Matlab? When I'm calling with uint8, I get the error: "Parameter can not be converted to a string."

So it seems that the input must be of "char" type, yet only one byte should be reserved for each character in the string...