Post Reply 
Desolve with symbolic constants
07-23-2024, 02:10 PM
Post: #1
Desolve with symbolic constants
Hallo!
How can I solve differential equations containing constant coefficient? Say I want to solve y"=y/a.
So I tried desolve(y"=y/a,x,y) without success.
So is it possible to do so using this calculator?
Find all posts by this user
Quote this message in a reply
07-23-2024, 04:28 PM
Post: #2
RE: Desolve with symbolic constants
Type shift () to get '', instead of "
Find all posts by this user
Quote this message in a reply
07-23-2024, 05:54 PM
Post: #3
RE: Desolve with symbolic constants
(07-23-2024 04:28 PM)parisse Wrote:  Type shift () to get '', instead of "

Which confused me for several seconds, because they looked almost identical in my font. If you missed it, the first is two single-quote characters (not including the comma character), and the second is the double-quote character.
Find all posts by this user
Quote this message in a reply
07-23-2024, 05:55 PM
Post: #4
RE: Desolve with symbolic constants
I did it. It didn't help.
Find all posts by this user
Quote this message in a reply
07-23-2024, 07:35 PM (This post was last modified: 07-23-2024 07:36 PM by C.Ret.)
Post: #5
RE: Desolve with symbolic constants
Don't despair, try harder.
I mean with the correct secret keystrokes:
[Image: attachment.php?aid=13748]


Attached File(s) Thumbnail(s)
   
Find all posts by this user
Quote this message in a reply
07-24-2024, 02:32 AM
Post: #6
RE: Desolve with symbolic constants
(07-23-2024 07:35 PM)C.Ret Wrote:  Don't despair, try harder.
I mean with the correct secret keystrokes:
[Image: attachment.php?aid=13748]

I tried it. It didn't help. I recieved [] as answer.
Find all posts by this user
Quote this message in a reply
07-25-2024, 10:38 PM (This post was last modified: 07-26-2024 02:27 PM by Gene222.)
Post: #7
RE: Desolve with symbolic constants
Check to see if a user variable "a" was created. On the CAS screen, press the Vars key, tap the User tab, then tap User Variables. A list of user variables will appear. If there is a variable a, use the arrors keys to highlight the variable, and the press the backspace or correction key to delete the variable.

This might make desolve(y''=y/a,x,y) work on the CAS screen. As previously stated, use single quotes. As near as I can tell for your problem, there should not be any cas or user variables for x,y, or a.
Find all posts by this user
Quote this message in a reply
07-26-2024, 04:29 PM
Post: #8
RE: Desolve with symbolic constants
Run the restart() command, this will insure all CAS variables are cleared.
Find all posts by this user
Quote this message in a reply
Post Reply 




User(s) browsing this thread: 3 Guest(s)