Equa diff Help
01-01-2014, 04:57 PM
Post: #1
 jc_63 Junior Member Posts: 5 Joined: Dec 2013
Equa diff Help
Hello, on HP Prime, when i enter in CAS mode :
deSolve(y+2E-3*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 ' ?
JC
01-01-2014, 05:18 PM
Post: #2
 Han Senior Member Posts: 1,883 Joined: Dec 2013
RE: Equa diff Help
(01-01-2014 04:57 PM)jc_63 Wrote:  Hello, on HP Prime, when i enter in CAS mode :
deSolve(y+2E-3*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 ' ?
JC

In CAS mode, use 2*10^(-3) and not 2E-3.

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01-01-2014, 05:46 PM
Post: #3
 jc_63 Junior Member Posts: 5 Joined: Dec 2013
RE: Equa diff Help
It's OK when i enter :
desolve(y+2E-3*diff(y)=0 AND y(0)=10,y)
> 10*e^(-500*x)
y' is not correct !
Thanks,
JC
01-02-2014, 09:04 PM
Post: #4
 jc_63 Junior Member Posts: 5 Joined: Dec 2013
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
01-02-2014, 09:31 PM
Post: #5
 Han Senior Member Posts: 1,883 Joined: Dec 2013
RE: Equa diff Help
(01-02-2014 09:04 PM)jc_63 Wrote:  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

An easier way to get ' is to use [Shift][ () ] and delete the extra tic mark.

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