Using rsolve with hp prime

12112015, 06:45 PM
Post: #1




Using rsolve with hp prime
Hi
I'm trying to get an explicit formula for the sequence u(n)=4*u(n1)5*u(n2)+2*u(n3) u(1)=1 u(2)=14 u(3)=43 With Xcas, I have no problem with the following line : rsolve(u(n)=4*u(n1)5*u(n2)+2*u(n3),u(n),[u(1)=1,u(2)=14,u(3)=43]) I get the correct answer. With the prime, I don't know how to do the same It is the [u(1)=1,u(2)=14,u(3)=43] part I don't see. I tried [] and {} delimiters with no success. Do you have any idea how to solve this on the prime ? Thank you. 

12112015, 07:18 PM
Post: #2




RE: Using rsolve with hp prime
Works for me.
I get [3*n+2^n*812]. Are you sure you are running rsolve in CAS? 

12122015, 11:24 AM
Post: #3




RE: Using rsolve with hp prime  
12122015, 01:55 PM
(This post was last modified: 12122015 03:47 PM by DrD.)
Post: #4




RE: Using rsolve with hp prime  
12122015, 02:58 PM
Post: #5




RE: Using rsolve with hp prime  
12122015, 03:31 PM
(This post was last modified: 12122015 03:36 PM by Helge Gabert.)
Post: #6




RE: Using rsolve with hp prime
Hmm . . . maybe something to do with the CAS settings? However, I can only see that unchecking "exact" throws an error message, but not empty brackets. What are your settings, especially the recursive values on p. 2?


12122015, 03:55 PM
(This post was last modified: 12122015 03:59 PM by wawa.)
Post: #7




RE: Using rsolve with hp prime  
12122015, 04:15 PM
(This post was last modified: 12122015 04:28 PM by wawa.)
Post: #8




RE: Using rsolve with hp prime
I think I figured out the problem : I have a CAS variable named n with a value of 0.
Now my problem is to purge this variable. I tried purge(n) and purge() but with no success Edit : It works ! I had a Hanoi program with an "EXPORT ...,n,..." command inside. I deleted this program and my variable n disapeared. The rsolve command is now running properly 

12122015, 04:21 PM
Post: #9




RE: Using rsolve with hp prime
Did you try restart?


12122015, 04:52 PM
Post: #10




RE: Using rsolve with hp prime
yes I tried the restart command with no success because my variable n was exported in a program. I had to delete this program to get things work.


12122015, 09:25 PM
Post: #11




RE: Using rsolve with hp prime
Good to know   I'm glad you figured it out!


« Next Oldest  Next Newest »

User(s) browsing this thread: 1 Guest(s)