symbolic solve differential equations HP50g
04-24-2014, 05:13 PM
Post: #1
 tgahan Junior Member Posts: 10 Joined: Apr 2014
symbolic solve differential equations HP50g
Hi everyone
Is it possible to include a value for cC(0) constant of integration when using desolve or must it be done using solve after getting the general solution using desolve.
example: d1y(t) = 2*t with y(0) = 4
Thanks for your time and help.
04-25-2014, 02:59 AM
Post: #2
 Steve Keeley Junior Member Posts: 18 Joined: Apr 2014
RE: symbolic solve differential equations HP50g
Try this:

2: ['d1y(t) = 2*t' 'y(0) = 4']
1: 'y(t)'
DESOLVE

(See page 16-9 in the HP 50g Manual)
04-25-2014, 08:46 AM
Post: #3
 tgahan Junior Member Posts: 10 Joined: Apr 2014
RE: symbolic solve differential equations HP50g
Hi Steve
Thanks very much. Worked exactly as you said.
Only got this calculator yesterday so very novice user.
How would it be coded in algebraic mode for the same example
thanks again
04-25-2014, 10:22 AM
Post: #4
 Steve Keeley Junior Member Posts: 18 Joined: Apr 2014
RE: symbolic solve differential equations HP50g
I'm not sure, since I never use algebraic mode. I'd guess:

DESOLVE( ['d1y(t) = 2*t' 'y(0) = 4'],y(t))

or maybe

DESOLVE( [d1y(t) = 2*t, y(0) = 4],y(t))

Experiment.
04-25-2014, 11:37 AM
Post: #5
 tgahan Junior Member Posts: 10 Joined: Apr 2014
RE: symbolic solve differential equations HP50g
Hi Steve
Your idea for ALG mode worked perfect. The second option without the quotes.
I never thought of the square brackets.
I had even tried pasting the level 2 format you gave me in your first post for rpn mode back into ALG mode but it would not work, only gave the general solution.
Thanks again ever so much
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