Subject: [1] enter (in console) ; [2] implicit functions
From: ivo welch
Date: Mon, 1 Oct 2012 08:41:02 -0700
also neat. also good stuff for Ed's book.
as to books, Ed's book is great---but it would help Maximia reach
another level if Ed's book became an O'Reilly reviewed and published
book. some sort of definite beginner's guide that would make it stand
out among the 10 other guides.
my guess is that 99% of Mathematica users and a large fraction of
Maxima users really don't do programming, but just want to use these
programs as symbolic calculators.
regards,
/iaw
----
Ivo Welch (ivo.welch at gmail.com)
http://www.ivo-welch.info/
J. Fred Weston Professor of Finance
Anderson School at UCLA, C519
Editor, Critical Finance Review, http://www.critical-finance-review.org/
On Mon, Oct 1, 2012 at 3:28 AM, Jaime Villate <villate at fe.up.pt> wrote:
> On 09/28/2012 05:04 PM, Stavros Macrakis wrote:
>>
>> (%i27) y + log(y) + x = 0;
>> (%o27) log(y)+y+x=0
>> (%i28) diff(%);
>> (%o28) (1/y+1)*del(y)+del(x)=0
>> (%i29) ratsubst(dydx,del(y)/del(x),%); <<< doesn't always produce
>> 'clean' result, but does in this case
>> (%o29) (((dydx+1)*y+dydx)*del(x))/y=0
>> (%i30) solve(%,dydx);
>
> It might be interesting for Ivo to know another way to do the same thing
> done above:
>
> (%i1) depends (y, x);
>
> (%o1) [y(x)]
>
> (%i2) diff (y + log(y) + x = 0, x);
>
> dy
>
> --
>
> dx dy
>
> (%o2) -- + -- + 1 = 0
>
> y dx
>
> (%i3) solve(%, diff(y,x));
>
> dy y
>
> (%o3) [-- = - -----]
>
> dx y + 1
>
>
> Regards,
> Jaime
>