PARI/gp - Printable Version +- Tetration Forum (https://math.eretrandre.org/tetrationforum) +-- Forum: Tetration and Related Topics (https://math.eretrandre.org/tetrationforum/forumdisplay.php?fid=1) +--- Forum: Computation (https://math.eretrandre.org/tetrationforum/forumdisplay.php?fid=8) +--- Thread: PARI/gp (/showthread.php?tid=1166) Pages: 1 2 PARI/gp - Xorter - 04/17/2017 Hi, again! I need your help in PARI/gp. I would like to substitute a value into x of sin(x): Code:`subst(sin(x),x,1)`But it returns with error. Why? Please, help me. RE: PARI/gp - Gottfried - 04/17/2017 (04/17/2017, 09:48 AM)Xorter Wrote: Hi, again! I need your help in PARI/gp. I would like to substitute a value into x of sin(x): Code:`subst(sin(x),x,1)`But it returns with error. Why? Please, help me. Code:`subst(Pol(sin(x)),x,1)` should work. But why not simply do Code:`sin(1)` ? RE: PARI/gp - Xorter - 04/17/2017 (04/17/2017, 04:27 PM)Gottfried Wrote: (04/17/2017, 09:48 AM)Xorter Wrote: Hi, again! I need your help in PARI/gp. I would like to substitute a value into x of sin(x): Code:`subst(sin(x),x,1)`But it returns with error. Why? Please, help me. Code:`subst(Pol(sin(x)),x,1)` should work. But why not simply do Code:`sin(1)` ? Oh, it was simplier than I thought. Thank you, my friend! Well, because I have found a new type of integration and derivation. These are iterated! And I needed substitution in a function in my gp. Really amazing. I am going to share my results on this forum as soon as possibly. (May be the key to determine what between addition and multiplication is.) Just wait a few days, please. RE: PARI/gp - Xorter - 04/17/2017 But somewhy it does not work with gamma function. RE: PARI/gp - sheldonison - 04/18/2017 (04/17/2017, 07:05 PM)Xorter Wrote: But somewhy it does not work with gamma function. sin(x+1) or gamma(x+1) RE: PARI/gp - Xorter - 04/18/2017 (04/18/2017, 05:37 AM)sheldonison Wrote: (04/17/2017, 07:05 PM)Xorter Wrote: But somewhy it does not work with gamma function. sin(x+1) or gamma(x+1) I have determined the graphs with sin functions, but now I would like to work with gamma, too. These methods are the generalizations of the integration and derivation... RE: PARI/gp - Xorter - 11/20/2017 Hi, again! Here is another problem. I would like to calculate this productum but without success: Code:`subst(exp(1/x),x,1/1000)`Why? RE: PARI/gp - Gottfried - 11/21/2017 (11/20/2017, 08:21 PM)Xorter Wrote: Hi, again! Here is another problem. I would like to calculate this productum but without success: Code:`subst(exp(1/x),x,1/1000)`Why? The error message in my (old) Pari/GP-system is                           Quote:exp(1/'x)    *** exp: negative exponent in gexp. I don't think they have anything new implemented for this problem so far. RE: PARI/gp - Xorter - 11/21/2017 I got the following error message:   ***   at top-level: subst(exp(1/x),x,1/1000)   ***                       ^------------------   *** exp: domain error in exp: valuation < 0 My question is that how can we solve this problem? RE: PARI/gp - Gottfried - 11/21/2017 (11/21/2017, 01:31 PM)Xorter Wrote: I got the following error message:   ***   at top-level: subst(exp(1/x),x,1/1000)   ***                       ^------------------   *** exp: domain error in exp: valuation < 0 My question is that how can we solve this problem? Perhaps it is meaningful for you to replace 1/x by exp(-u) where u=log(x) ? At least this gives a power series (more precisiely a puisieux-series)