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    $\begingroup$ try Map[FromDigits, StringSplit[StringData[[All, 2]], ","], {-1}]? $\endgroup$ Commented Aug 30, 2019 at 20:42
  • $\begingroup$ Thank you very much! I will test your method. In addition I add one small question in the end. Seems Internal`StringToDouble does not work with with a lists containing large number but fine with one single string. Do you know why?@kglr $\endgroup$ Commented Aug 30, 2019 at 21:00
  • $\begingroup$ Map[FromDigits, StringSplit[StringData[[All, 2]], ","], {-1}] works good. Is it possible works with string list with negitave number such as "-1" and so on? @kglr $\endgroup$ Commented Aug 30, 2019 at 21:07
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    $\begingroup$ because Internal`StringToDouble does not have the Listable attribute. You can make listable version using istd = Internal`StringToDouble; SetAttributes[istd, Listable] $\endgroup$ Commented Aug 30, 2019 at 21:08
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    $\begingroup$ @kglr that's an interesting subtlety to Listable... I hadn't realized it would take precedence over evaluating to Internal`StringToDouble. I assumed the Head would evaluate, then any Attributes would apply but I suppose it's the other way around? $\endgroup$ Commented Aug 30, 2019 at 21:17