RPN - Solve
10-06-2016, 04:42 AM
Post: #1
 Magnus512 Junior Member Posts: 23 Joined: Sep 2016
RPN - Solve
I'm going to write about some topic here

The RPN in CAS mode is going to be implemented in the future ?

The solve comand doesn't work for this
http://h30434.www3.hp.com/t5/Calculators...3790#M6767

And the last thing. Is there any chance to know if theres a new calculator in the way ? Something like HP50g succesor?
10-06-2016, 06:50 AM
Post: #2
 retoa Member Posts: 168 Joined: Jan 2015
RE: RPN - Solve
(10-06-2016 04:42 AM)Magnus512 Wrote:  The solve comand doesn't work for this
http://h30434.www3.hp.com/t5/Calculators...3790#M6767

You are using capital letters, which always have an assigned value. You should use unassigned variables.
10-06-2016, 03:38 PM
Post: #3
 Magnus512 Junior Member Posts: 23 Joined: Sep 2016
RE: RPN - Solve
(10-06-2016 06:50 AM)retoa Wrote:
(10-06-2016 04:42 AM)Magnus512 Wrote:  The solve comand doesn't work for this
http://h30434.www3.hp.com/t5/Calculators...3790#M6767

You are using capital letters, which always have an assigned value. You should use unassigned variables.

I'm not ussing capital letters
10-06-2016, 09:40 PM
Post: #4
 retoa Member Posts: 168 Joined: Jan 2015
RE: RPN - Solve
(10-06-2016 03:38 PM)Magnus512 Wrote:
(10-06-2016 06:50 AM)retoa Wrote:  You are using capital letters, which always have an assigned value. You should use unassigned variables.

I'm not ussing capital letters

Sorry, you are right, I looked at the wrong picture...
10-06-2016, 10:22 PM
Post: #5
 roadrunner Member Posts: 278 Joined: Jun 2015
RE: RPN - Solve
I believe Magnus is wondering why solve((x^2-6*x+(7/x)+p) = 0,x) returns empty brackets on the Prime while returning:

x = 2*(√(-3*(p-12))*cos((asin((3*(2*p-9)*√(3)/(2*(12-p)^(3/2))))/3)+(π/6))+3)/3

or

x = -2*(√(-3*(p-12))*sin((asin((3*(2*p-9)*√(3)/(2*(12-p)^(3/2))))/3)+(π/3))-3)/3

or

x = 2*(√(-3*(p-12))*sin((asin((3*(2*p-9)*√(3)/(2*(12-p)^(3/2))))/3))+3)/3

on the ti-nspire cx cas.

10-06-2016, 11:41 PM
Post: #6
 Magnus512 Junior Member Posts: 23 Joined: Sep 2016
RE: RPN - Solve
(10-06-2016 10:22 PM)roadrunner Wrote:  I believe Magnus is wondering why solve((x^2-6*x+(7/x)+p) = 0,x) returns empty brackets on the Prime while returning:

x = 2*(√(-3*(p-12))*cos((asin((3*(2*p-9)*√(3)/(2*(12-p)^(3/2))))/3)+(π/6))+3)/3

or

x = -2*(√(-3*(p-12))*sin((asin((3*(2*p-9)*√(3)/(2*(12-p)^(3/2))))/3)+(π/3))-3)/3

or

x = 2*(√(-3*(p-12))*sin((asin((3*(2*p-9)*√(3)/(2*(12-p)^(3/2))))/3))+3)/3

on the ti-nspire cx cas.

Exactly, I mean why ?
10-09-2016, 12:33 PM
Post: #7
 roadrunner Member Posts: 278 Joined: Jun 2015
RE: RPN - Solve
(10-06-2016 11:41 PM)Magnus512 Wrote:  Exactly, I mean why ?

That question has been discussed on this forum before. I do know that when you try that equation in Xcas it gives this: "Warning! Algebraic extension not implemented yet for poly [1,-6,p,7]", emphasis added.

Perhaps a promise of future implementation?