Re: Speeding up Mathematica / numerical precision

*To*: mathgroup at yoda.ncsa.uiuc.edu*Subject*: Re: Speeding up Mathematica / numerical precision*From*: uunet!renoir.Berkeley.EDU!fateman (Richard Fateman)*Date*: Sun, 18 Mar 90 12:58:50 -0800

The idea of sharing data structures (such as fortran arrays) between algebraic manipulation programs and Fortran / C stuff was promoted by Franz Lisp / Vaxima (c. 1979) when we decided to have the same structures for convenience of "foreign function" calls. I assumed that no Lisp compiler would do as good as the best Fortran compiler in compiling numerical code. Direct links to fortran code (NAG library, IMSL library, MINPACK) were handled fairly conveniently. About using N[ ...,30] around everything... this may not work because in Mathematica, f[N[...,30]] and N[f[...],30] are not the same. Richard Fateman