|Thomas Geffers on Thu, 22 Apr 2004 15:27:23 +0200|
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|change variables in multivariant polynomials.|
Hi everyone! I am a newbee and I have the following problem: I am writing a program with gp with multivariant polynomials. Because of the order of the variables I would like to change all the variables from the input-polynomials. But my way is not very elegant (and by the way does not work very good;-). ie: g=(u^4-4*u)*z^4 + u*z^2 -1; variable(g) is now u. I get the other variable with variable(Vec(g)); \\ It gives the correct z. My problem is, that I can not change this variable with changevar. I "solve" this problem with a loop with the following kernel: Pol(Vec(g)[i],w) \\ hence for each coefficient. As in the docomentation written, this can lead to invalid objects. Is there a more elegant (correct?) way to solve this? I know, that PARI/GP treats multivariant polynomials as univariant polynomials with polynomial coefficients, but is there a possiblity to get all variables at once? Thank you very much, Thomas Geffers This message has been scanned but we cannot guarantee that it and any attachments are free from viruses or other damaging content: you are advised to perform your own checks. Email communications with the University of Nottingham may be monitored as permitted by UK legislation.