Equa diff Help

01012014, 04:57 PM
Post: #1




Equa diff Help
Hello, on HP Prime, when i enter in CAS mode :
deSolve(y+2E3*y'=0 AND y(0)=10,y) I get an error "bad arguments". How to define the diff operator ' or diff() ? Is there a special key to ' ? Thanks for your help. JC 

01012014, 05:18 PM
Post: #2




RE: Equa diff Help
(01012014 04:57 PM)jc_63 Wrote: Hello, on HP Prime, when i enter in CAS mode : In CAS mode, use 2*10^(3) and not 2E3. Graph 3D  QPI  SolveSys 

01012014, 05:46 PM
Post: #3




RE: Equa diff Help
It's OK when i enter :
desolve(y+2E3*diff(y)=0 AND y(0)=10,y) > 10*e^(500*x) y' is not correct ! Thanks, JC 

01022014, 09:04 PM
Post: #4




RE: Equa diff Help
I've found : the ' is in Chars (Shift Vars) and y' is correctly coded as diff().
With Shift 9, the ' is not the same but minute (angle unit). It is a source of error ! JC 

01022014, 09:31 PM
Post: #5




RE: Equa diff Help
(01022014 09:04 PM)jc_63 Wrote: I've found : the ' is in Chars (Shift Vars) and y' is correctly coded as diff(). An easier way to get ' is to use [Shift][ () ] and delete the extra tic mark. Graph 3D  QPI  SolveSys 

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