Re: Determining the inverse function operation from a function definition

glen herrmannsfeldt <gah@ugcs.caltech.edu>
30 Apr 2005 10:57:30 -0400

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Re: Determining the inverse function operation from a function definit nmm1@cus.cam.ac.uk (2005-04-30)
Re: Determining the inverse function operation from a function definit gah@ugcs.caltech.edu (glen herrmannsfeldt) (2005-04-30)
Re: Determining the inverse function operation from a function definit drdiettrich@compuserve.de (Dr. Diettrich) (2005-05-13)
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From: glen herrmannsfeldt <gah@ugcs.caltech.edu>
Newsgroups: comp.compilers
Date: 30 Apr 2005 10:57:30 -0400
Organization: Compilers Central
References: 05-04-067 05-04-092
Keywords: theory
Posted-Date: 30 Apr 2005 10:57:30 EDT

Dr. Diettrich wrote:


(snip)


> Things will become a bit more complicated with exponentiation, sine,
> or other non-linear functions, which may require more complex
> transformations.


Well, there are log() and arcsin() for those cases...


> IMO you better ask your questions in a math group. Even if your problem
> is related to "symbol manipulation" or "transformation", it's not a
> matter of compilers nor grammars.


There are two questions. One how to actually do the transformation,
and that should belong to a different group. Mathematica being one of
the more popular symbolic math programs, you might look at that.


The problem of parsing mathematical expressions is still there, and
should still be appropriate here. As one example, operator precedence
still exists in symbolic math.


-- glen


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