material cutting plan programe

I have a lisp programme to preparing a output layout form the user input.The main problem is in my programme, loop .
For example :-
Input given 200 Nos
Output based on 66 Nos

The programme must be run combinations and permutations formula NCR times (200 C 66) to run the loop and it will automatically slowed to complete the process. it take 1 hours to complete the process.

Any ideas to improve the loop speed.

 

Why don't you post your lisp routine so that others can
give you some suggestions for improvement ?

http://www.cadtown.com

 

I must be misunderstanding. You are going to run the loop
200!/(66!*136!) times? That's 7.26975E+53. Computer technology is not
there yet. Please clarify. It would be helpful if you could post the
loop.

If you are running into long times for calculation, recall that lisp is
an interpreted language. It demands a lot of overhead just to read the
next step and implement it. You would likely see a great improvement if
you used a compiled language like C or Vbasic to do the grunt work.

rs

input.The main problem is in my programme, loop .

times (200 C 66) to run the loop and it will automatically slowed to
complete the process. it take 1 hours to complete the process.

 

For an operation like this, I would use Visual Basic.
Use Lisp if needed to obtain 'input', numbers..when
done gathering input, do startapp of VB. Read-in data
file, loop (in VB), and Output data-file. Much faster.

Bob Shaw

 

The speed degradation might be due to the methods you are using. For instance
(repeat) can be many times faster than (while). Also, if not all the numbers
are used each time, a (foreach) might serve you better.

If you can post the code via attachment, maybe the friendly helpers here will
find some improvements for you. Bear in mind that if the program is big (I
think that means > 16Kb), then post the file in customer files, and let us know
to look for it.

main problem is in my programme, loop .

(200 C 66) to run the loop and it will automatically slowed to complete the
process. it take 1 hours to complete the process.