cross product (recursively)
Author
I''m trying to solve a problem with LISP involving making a function that computes the cross product. For example:
(xprod ''(a b) ''(c d e)) = ((a c) (a d) (a e) (b c)...(b e))
Can anyone help me out with an algorithm or even source code? I could do it quite easily with iteration, but I have to do it recursively.
Sounds VERY much like homework to me. Can you justify that this is NOT homework (and hence stop me from closing this thread)?
Cheers,
Timkin
Cheers,
Timkin
Author
Actually its an extra credit problem. I didn''t know that was against the board rules. Close it if you like.
heh, the threatening aspect of your message is kind of blunted by the "Cheers, Timkin" bit...
Cheat. Make a cross product function that returns an n component vector orthogonal to n-1 n component vectors. Use the determinant representation of the cross product to determine how to do the recursion. Stop when you get one 2 component vector.
Thanks for the help anyway.
_Josh,
There is a forum FAQ that describes my policy on homework. You can view it here:
http://www.gamedev.net/community/forums/showfaq.asp?forum_id=20
No harm done this time, but I am going to close the thread since you clearly were looking for an answer to a homework problem.
Graham Rhodes
Senior Scientist
Applied Research Associates, Inc.
There is a forum FAQ that describes my policy on homework. You can view it here:
http://www.gamedev.net/community/forums/showfaq.asp?forum_id=20
No harm done this time, but I am going to close the thread since you clearly were looking for an answer to a homework problem.
Graham Rhodes
Senior Scientist
Applied Research Associates, Inc.
This topic is closed to new replies.
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