It looks for an string, that smells a little bit like a expression. I think it is good idea to offer something, that can be interpreted as an exponent.
Am 12.06.2011 11:07, schrieb ADL: > On 11 Giu, 12:52, "Dr. Peter Klamser"<klam...@googlemail.com> wrote: >> ... ToExpression["1+1"] >> >> One Hint: If you know a function in Mathematica like "ToString", you >> mentioned in your email, look in the help system in the section "see >> also", there you find ToExpression["1+1"]. >> >> Kind regards >> >> Peter >> >> Am 11.06.2011 09:59, schrieb Ted Sariyski: >> >>> Hi, >>> Is there a built-in function which returns the numeric value of a string >>> (like ToString but inverse). Currently I use mine function toNumber: >>> ch = StringToStream[timeStr]; >>> timeNum = Read[ch, Number]; >>> Close[ch]; >>> but I suspect there is easier way. >>> Thanks in advance, >>> --Ted >> -- >> Mit freundlichen Gr en >> >> Uta& Peter Klamser > The request is less trivial than ToExpression["1+1"] since, for > example, typical number format cannot be read into Mathematica without > the rather involved trick reported by Ted Sariyski. As an example, > > ToExpression["1e3"] > ==> e3 > > > ch = StringToStream["1e3"]; > timeNum = Read[ch, Number]; > Close[ch]; > timeNum > ==> 1000 > > I feel this complication as rather unfortunate, unless I am also > missing a simpler way to read in numbers. > > ADL >