Implicit differentiation on HP Prime.

12172013, 03:37 AM
Post: #1




Implicit differentiation on HP Prime.
Hi Everybody,
Does anybody knows how to implicitly differentiate functions on HP Prime? Thanks. 

12172013, 04:38 AM
Post: #2




RE: Implicit differentiation on HP Prime.
When I do:
diff(3*7^xx*g(x^2),x) I get: x*diff(g(x^2),x)+3*7^x*LN(7)g(x^2) which is pretty much correct except it did not simplify diff(g(x^2),x) since it has no idea what g(x) is  I intentionally left g(x) undefined for this example. Graph 3D  QPI  SolveSys 

12172013, 05:34 AM
Post: #3




RE: Implicit differentiation on HP Prime.
Thanks. I tried something similar but I could not solve for diff(y(x),x). I think results with diff(y(x),x) are pretty useless because you can't use them in farther calculations. I hope they will implement implicit differentiation i next ROM update.


12172013, 05:55 AM
Post: #4




RE: Implicit differentiation on HP Prime.
(12172013 05:34 AM)John P Wrote: Thanks. I tried something similar but I could not solve for diff(y(x),x). I think results with diff(y(x),x) are pretty useless because you can't use them in farther calculations. I hope they will implement implicit differentiation i next ROM update. Use subst() or convert the result into a string with STRING(). Then use REPLACE() and (to replace "diff(y(x),x)" with just "Yy" for example) and then convert back to a symbolic via EXPR() and continue with solving. Just make sure to add single quotes around the string before using EXPR(). You can probably automate this in a program. Graph 3D  QPI  SolveSys 

12172013, 07:47 AM
Post: #5




RE: Implicit differentiation on HP Prime.
I can do it manually, it works fine with replace, but I can't make program to do the staff. Always getting an error when exiting program mode.


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