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Syntax for Differential Equations Solver / desolve()???
09-04-2015, 11:31 PM
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RE: Syntax for Differential Equations Solver / desolve()???
(09-04-2015 09:11 PM)ewjax Wrote:  Thanks for responses. The clearing/purging of existing variables seemed to do the trick. As an aside - that seems disconcerting that I have to remember to purge all variables prior to using the solver...

I also learned I am only able to make it work by using the y' form of differential - the dy/dx template does not seem to work (yields "undef" message).

If you want to do numerical calculations, do them in the home screen where you need to assign values to the variables for the function to evaluate. Assigning a value to X in the home screen will not affect the variable x in the CAS. I've run into that issue as well, and I've found this approach works. If you insist on assigning values to variables in the CAS, get in the habit of clearing the variable immediately after evaluation. vars -> CAS -> All -> highlight the var and hit the del key.
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RE: Syntax for Differential Equations Solver / desolve()??? - pwarmuth - 09-04-2015 11:31 PM



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