Re: ax=0

[Geraint Paul Bevan]

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address@hidden wrote:
| sorry - i mean underdeterminded, so i have more variables than
equations. so
| there is no script/funktion to solve it with octave?
|

Octave can solve over-determined equations (see the fsolve
documentation, for example) but under-determined systems do not have
unique answers and are therefore not really amenable to numeric solution.

If you want all possible solutions (rather than just testing if a
particular solution is valid), you will need to use a computer algebra
system.

With ginsh (part of GiNaC), you can do:
| lsolve({x+y+z-12==0,x-y+z==2},{x,y,z});

which will return the answer
{x==7-z,y==5,z==z}

There are several symbolic algebra tools listed on the wiki:
http://wiki.octave.org/wiki.pl?CategorySymbolic

- --
Geraint Bevan
http://www.mech.gla.ac.uk/~gbevan

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