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| Degree of polynomial wrt a variable https://www.singular.uni-kl.de/forum/viewtopic.php?f=10&t=2819 |
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| Author: | IliaToli [ Sat Jan 19, 2019 7:52 am ] |
| Post subject: | Degree of polynomial wrt a variable |
How do you check the degree of a polynomial wrt a variable? deg(poly) seems to give the total degree. |
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| Author: | gorzel [ Sun Jan 20, 2019 7:56 pm ] |
| Post subject: | Re: Degree of polynomial wrt a variable |
deg can be called with an intvec as a second argument: http://www.singular.uni-kl.de/Manual/latest/sing_225.htm#SEC265 Thus one can easily build a suitable command, e.g: Code: > proc vardeg(poly f, int n) { return(deg(f,leadexp(var(n)))); }
> ring rdp =0,(x,y),dp; > poly f = x2+y3+x4y2+x5 +x2y; > deg(f); 6 > vardeg(f,2); 3 > vardeg(f,1); 5 > // the proc makes an implicit check of the second argument for the variable number: > vardeg(f,3); ? var number 3 out of range 1..2 ? error occurred in or before ::vardeg line 1: ` return(deg(f,leadexp(var(n)))); ` ? leaving ::vardeg skipping text from `;` error at token `)` |
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