Re: Fastening the run-time interpretation of mathematical expressions

On Monday 13 Nov 2006 21:31, Martin Ward wrote:
> At run time, your program could write out a file containing a
> standalone C function which implements the mathematical function,
> compile this to a shared library (or DLL), dynamically link it in, and
> call the function as required.


I forgot to add that when I wanted to solve the exact same problem in
interpreted BASIC on a Compukit UK101 machine (with a 6502 processor
running at 2 MHz and 4 KB of RAM) I needed a rather different
approach. Take the string containing the mathematical formula, convert
BASIC keywords to tokens, and overwrite a line of the running program
with the new BASIC line (the space required having been pre-allocated
by padding the line in question with spaces!).


Recently I managed to resurrect the 25 year old tapes, so you can find
the source code in file tapes_2/audio001-002.txt in UK101-tapes.zip on
this page: http://www.cse.dmu.ac.uk/~mward/martin/software#UK101


--
Martin


martin@gkc.org.uk http://www.cse.dmu.ac.uk/~mward/ Erdos number: 4
G.K.Chesterton web site: http://www.cse.dmu.ac.uk/~mward/gkc/
[Wow, that's gross. -John]

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