Posts: 93
Threads: 30
Joined: Aug 2016
Hi, again!
I need your help in PARI/gp. I would like to substitute a value into x of sin(x):
But it returns with error. Why? Please, help me.
Xorter Unizo
Posts: 789
Threads: 121
Joined: Aug 2007
(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):
But it returns with error. Why? Please, help me.
Code: subst(Pol(sin(x)),x,1)
should work. But why not simply do ?
Gottfried Helms, Kassel
Posts: 93
Threads: 30
Joined: Aug 2016
04/17/2017, 05:53 PM
(This post was last modified: 04/17/2017, 05:54 PM by Xorter.)
(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):
But it returns with error. Why? Please, help me.
Code: subst(Pol(sin(x)),x,1)
should work. But why not simply do
?
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.
Xorter Unizo
Posts: 93
Threads: 30
Joined: Aug 2016
But somewhy it does not work with gamma function.
Xorter Unizo
Posts: 683
Threads: 24
Joined: Oct 2008
(04/17/2017, 07:05 PM)Xorter Wrote: But somewhy it does not work with gamma function.
sin(x+1) or gamma(x+1)
 Sheldon
Posts: 93
Threads: 30
Joined: Aug 2016
(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...
Xorter Unizo
Posts: 93
Threads: 30
Joined: Aug 2016
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?
Xorter Unizo
Posts: 789
Threads: 121
Joined: Aug 2007
(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/GPsystem is
Quote:exp(1/'x)
*** exp: negative exponent in gexp.
I don't think they have anything new implemented for this problem so far.
Gottfried Helms, Kassel
Posts: 93
Threads: 30
Joined: Aug 2016
I got the following error message:
*** at toplevel: subst(exp(1/x),x,1/1000)
*** ^
*** exp: domain error in exp: valuation < 0
My question is that how can we solve this problem?
Xorter Unizo
Posts: 789
Threads: 121
Joined: Aug 2007
(11/21/2017, 01:31 PM)Xorter Wrote: I got the following error message:
*** at toplevel: 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 puisieuxseries)
Gottfried Helms, Kassel
