Am 25.11.2012 00:40, schrieb Martin Helm: > Orbeman wrote >> In fact, I have several equations like this : >> >> x^2+y^2+x+y+x*y+z^2-1=0 >> >> I can express z=sqrt(1-...) but in a general case... I found this one http://www.scilab.org/contrib/index_contrib.php?page=displayContribution&fileID=1236 have not tested it yet but looks promising.