convert char to double

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lovedive0142 2022-9-27

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1812775-convert-char-to-double

编辑： Stephen23 2022-9-27

var = '0' (this is char)

and i want this value convert 'double'

so i used

out = str2double(regexp(var,'\d*','match')

But I have a parse error

How can I get the val value in double?

For reference, if str2double is used, the NAN value is obtained.

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Stephen23 2022-9-27

编辑：Stephen23 2022-9-27

在 MATLAB Online 中打开

var = '0'; %                              v   missing parenthesis
out = str2double(regexp(var,'\d*','match'))
out = 0
out = str2double(var)
out = 0

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回答（1 个）

Davide Masiello 2022-9-27

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1812775-convert-char-to-double#answer_1061410

编辑：Davide Masiello 2022-9-27

在 MATLAB Online 中打开

var = '0';
out = str2double(var)
out = 0
whos out
  Name      Size            Bytes  Class     Attributes

  out       1x1                 8  double              

No need to use regular expressions at all, at least in Matlab.

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Davide Masiello 2022-9-27

What you see in my answer is obtained running Matlab R2022b.

What version do you use?

lovedive0142 2022-9-27

i'm using Matlab R2022b too..

Actually, I'm getting this data from another place, but isn't the char value correct if it pops up like this?......

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MATLAB Language Fundamentals Data Types Data Type Conversion

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