Re: A89: user functions
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Re: A89: user functions
> Say I wanted to write a
> function for multivariable implicit differentiation...a simple example:
>
> v = r+s, find dv/dt,dr/dt,and ds/dt
>
> answer: dv/dt = dr/dt+ds/dt (I think that's right,been too long since
> Cal I =P)
Just a question: Why are you using a function for this? People are
always underestimating the capabilities of a TI-89. Just write:
d(v(t)=r(t)+s(t),t)
and the result will come out like this:
d(v(t),t)=d(r(t),t)+d(s(t),t)
(for this simple example)
If you want to get more complicated and solve this for something, and
can't do that yourself - assuming you are one of those usual TI-89 users - you
just have to substitute a variable for what you want to solve for, and voilą!
You can even do that by writing:
ans(1)|d(r(t),t)=a
Now if that didn't help you, try doing this with the SDK, or worse,
TI-GCC. (I love that EStack - never used it, but it is probably good for RPN
;-).)
Don't worry about the look of these equations; they look a lot nicer with
Pretty Print. I cannot guarantee that these work with AMS versions other
than 2.03. For any further questions, mail me or turn this over to the math
list people.
BTW: Scott, NO!
Sebastian Reichelt
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