Why do I lost negative values in cell

4 次查看（过去 30 天）
Jean-Marie Sainthillier
评论： Jean-Marie Sainthillier 2020-3-12
If S={'md' 0 1 2 3 -1} for example with 'md' for missing data and values between -3 and 3 (-3,-2,-1,0,1,2,3).
  • double([S{2:end}]), I obtain [0 1 2 3 -1]. Everything is OK.
  • double([S{1:end}]), I obtain [109 100 0 1 2 3 0]. 109 and 100 for ascii codes of 'md', OK but I lost my negative value -1 (0 instead).
I understand that I mix two types of data (char and signed integers) and that the array concatenation operator [] must choose, but why negative values are impacted ?
Thank you in advance.

请先登录，再回答此问题。

采纳的回答

Ameer Hamza
Ameer Hamza 2020-3-12
编辑：Ameer Hamza 2020-3-12
When you run
[S{1:end}]
The MATLAB returns the value as a char array, which is similar to unit16 array. It can only hold values between 0 to 65535. If you input negative values, it is converted to zero, and any positive value above 65535 is converted to 65535. For example
>> double(char(100000))
ans =
65535
>> double(char(-10))
ans =
0

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Data Type Conversion 的更多信息

标签

产品


版本

R2019b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by