Re: Reading Fortran Data file

*To*: mathgroup at smc.vnet.net*Subject*: [mg100320] Re: Reading Fortran Data file*From*: Szabolcs <szhorvat at gmail.com>*Date*: Mon, 1 Jun 2009 07:06:10 -0400 (EDT)*References*: <gvtmic$gho$1@smc.vnet.net>

On May 31, 1:35 pm, christopher pike <mojoflowstu... at gmail.com> wrote: > Hi, > Have data fortran data file with numbers like 0.447562485933D-01. = I > need all the digits, but mathematica seems to only read this as > 0.0448062. > I can read it as a string and get > > "0.448062494397D-01" > > but when I use ToExpression, I get > > -1 + 0.448062 D > > So how can I read in all the digits. > Fortran's D notation counts as somewhat unusual these days, but the more common E notation should work fine with Mathematica. So just change all Ds to Es with some program before reading the file. For example, filter the file through the common tr utility: Import["!tr D E < inputfile", "Table"] (Of course one could read everything as a string, using "Text" in Import, then do the replacement using StringReplace[textData, "D" -> "E"], then use StringImport, but this might not be the best solution when the file is big and one is low on memory. A disadvantage of Mathematica's way of processing data is that it needs to hold everything in memory.)