Extracting a number from a changing string using sscanf

Question

Rodmehr Semnani 2016-5-5

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/282753-extracting-a-number-from-a-changing-string-using-sscanf

评论： Rodmehr Semnani 2016-5-6

采纳的回答： Walter Roberson

在 MATLAB Online 中打开

Hi there!

I'm having trouble extracting a number from a data string that isn't always consistent.

I'm getting incoming strings that sometimes change their format, but will always have a number with a "G" after it. For example:

ans = 
      +1.4105 G           799 ON 1X OFF
ans = 
isj34 ME102+03994 G
ans = 
         ME101-04230 G 17 OFF

It can be formatted a whole mess of ways, but the one thing that is consistent is the sign, number, and "G" after it. (there are blank spaces sometimes, the ME10# will sometimes be there, sometimes will not, and if it is, there's no guarantee that the # is 1 or 2)

I've tried using sscanf to simply extract the number, for example:

sscanf('silj 90 ME102-014830 G','ME102%f G',1)

or

sscanf('silj 90 ME102-014830 G','%*s ME102%f G',1)

or

sscanf('silj 90 ME102-014830 G','%*f ME102%f G',1)

and I'm looking for:

ans = 
      -14830

So far I've only gotten blank strings.

Open to any suggestions. Thanks!

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Answer 1

Walter Roberson 2016-5-5

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/282753-extracting-a-number-from-a-changing-string-using-sscanf#answer_220942

在 MATLAB Online 中打开

sscanf('silj 90 ME102-014830 G','%*[^-+]%f G',1)

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Rodmehr Semnani 2016-5-6

I found a way to do it, but it looks like it's meant to be shown to CS majors being interrogated at Guantanimo. Your's is tremendously better and cleaner.

Thanks!

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