FortranForm
in [Mathematica]
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From: Gideon on 4 May 2010 06:30 I have two, possibly related, questions on the FortranForm command. 1. Is it possible to get Fortran 90/95 style output? In particular, I'd like to have long lines broken up with the end of line & character, rather than the sixth column indicator as it is now. 2. Is it possible to get it to output decimals where it has whole numbers? For instance, in some code I have, a factor of sqrt(2) appears. FortranForm renders this as Sqrt(2). My compiler (gfortran 4.4) doesn't like this because it sees this as the square root of an integer. I have been resolving this with find-replace, and suspect I could also deal with it by compiler flags, but it's annoying.
From: David Reiss on 5 May 2010 06:04 I think that the short answer to your questions is that FortranForm is a very old component of Mathematica that I suspect has not been updated since version 1.0 (and toe documentation indicates this). So, for question # 1 the answer is no. For question #2 you need to write a function of your own that searches out exact expressions and substitutes the numerical values with the appropriate precision & c. Hope this helps, David On May 4, 6:30 am, Gideon <gideon.simp...(a)gmail.com> wrote: > I have two, possibly related, questions on the FortranForm command. > > 1. Is it possible to get Fortran 90/95 style output? In particular, > I'd like to have long lines broken up with the end of line & > character, rather than the sixth column indicator as it is now. > > 2. Is it possible to get it to output decimals where it has whole > numbers? For instance, in some code I have, a factor of sqrt(2) > appears. FortranForm renders this as Sqrt(2). My compiler (gfortran > 4.4) doesn't like this because it sees this as the square root of an > integer. I have been resolving this with find-replace, and suspect I > could also deal with it by compiler flags, but it's annoying.
From: Gerry Flanagan on 5 May 2010 06:07 There is a library package available by Mark Sofroniou. http://library.wolfram.com/infocenter/MathSource/60/ It is a much more general approach than the built-in FotranForm, and there are options to do just what you're asking. Unfortunately, it hasn't been maintained for the latest Mathematica versions (to my knowledge), so you may get a few warnings and errors, particularly related to subexpression optimization. I've generally managed work-arounds. Gerry F. On 5/4/2010 6:30 AM, Gideon wrote: > I have two, possibly related, questions on the FortranForm command. > > 1. Is it possible to get Fortran 90/95 style output? In particular, > I'd like to have long lines broken up with the end of line& > character, rather than the sixth column indicator as it is now. > > 2. Is it possible to get it to output decimals where it has whole > numbers? For instance, in some code I have, a factor of sqrt(2) > appears. FortranForm renders this as Sqrt(2). My compiler (gfortran > 4.4) doesn't like this because it sees this as the square root of an > integer. I have been resolving this with find-replace, and suspect I > could also deal with it by compiler flags, but it's annoying. > > >
From: slawek on 5 May 2010 06:04 U=BFytkownik "Gideon" <gideon.simpson(a)gmail.com> napisa=B3 w wiadomo=B6cigrup dyskusyjnych:hrosvr$5sc$1(a)smc.vnet.net... > I have two, possibly related, questions on the FortranForm command. > > 1. Is it possible to get Fortran 90/95 style output? In particular, > I'd like to have long lines broken up with the end of line & > character, rather than the sixth column indicator as it is now. The output in the "fortran form" is not a "clean" Fortran IV/77/90/95/2003 source. :( A simple gawk script should help. BTW, CForm does not give "clean" C source. > 2. Is it possible to get it to output decimals where it has whole > numbers? For instance, in some code I have, a factor of sqrt(2) Use N, here is a example (20-digit acc.): N[yourExpressionHere,20] // FortranForm N[Sqrt[2]] // FortranForm slawek
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