7 May 1998 16:53:26 -0400

Related articles |
---|

mathematical function parser/compiler jens.dreger@physik.fu-berlin.de (Jens Dreger) (1998-05-04) |

Re: mathematical function parser/compiler bernecky@acm.org (Robert Bernecky) (1998-05-07) |

Re: mathematical function parser/compiler f81@ix.urz.uni-heidelberg.de (Joerg Schoen) (1998-05-07) |

Re: mathematical function parser/compiler ramb@synopsys.com (Ram Bhamidipaty) (1998-05-12) |

From: | Robert Bernecky <bernecky@acm.org> |

Newsgroups: | comp.compilers |

Date: | 7 May 1998 16:53:26 -0400 |

Organization: | ICAN.Net Customer |

References: | 98-05-021 |

Keywords: | parse, interpreter |

Jens Dreger wrote:

*> I'm looking for a c/c++ function, that takes some string like*

*> f(x)=1/(1+x^2)*

*> at runtime (!) and returns a function that evaluates this*

*> expression when called within the program. This sounds like a*

*> common problem, so I assume it has already been solved, but I*

*> couldn't find anything like that.*

You might try calling a J interpreter DLL if you're in windoze (not sure

how their linux version works). J is an offshoot of APL

that has some very nice array handling facilities in it.

In J, you could write something along the lines of:

f=. 1 % 1+ y. ^2 NB. y. is the argument

then do:

f 10 20 40...

and execute foo on a whole array (not necessarily just a vector)

at once.

Look at http://www.jsoftware.com

Bob

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