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Re: a simple question
Posted:
Sep 25, 2013 2:31 AM


Hi Murray
A neat and simple answer to a simple question, and as always with yourself and a few other MathGroup regulars, very helpful.
I can't help feeling, though, every time I see a question of this type ("I am beginner for Mathematica"), that the poster has not even tried to look into the Help. In real life when I'm asked a question like this, my first response is usually to say, "Show me what you've tried."
Or else I would be tempted to answer, somewhat in the Bob Hanlon style, "See http://reference.wolfram.com/mathematica/ref/Solve.html".
As I've said more than once before in a similar MathGroup gripe, "Give a man a fish, feed him for a day; teach a man to fish, feed him for a lifetime". (Lao Tzu, apparently.)
Best wishes
Barrie
>>> Murray Eisenberg <murray@math.umass.edu> 09/24/13 6:17 PM >>> Do you mean you want to solve that equation for h? (That's a different thing than "evaluating it", which would not be possible since the left hand side is not the sort of expression to which you can assign a value  and what does is to assign a value. Whereas == denotes an equality.)
Perhaps you mean something like the following:
Solve[A Log[h]/h  x == 0, h]
The result you'll get gives the solution as:
h > ((A*ProductLog[(x/A)])/x
This may or may not be of use to you, since ProductLog is a not an "elementary" function.
Do A and x have some specific values?
By the way, it's a bad idea to use names in Mathematica that are, or begin with, an uppercase letter  because that risks confounding them with the names of builtin objects.
On Sep 23, 2013, at 9:59 PM, Dhaneshwar Mishra <dhaneshwarmishra@gmail.com> wrote:
> > I would like to evaluate A*Log[h]/h x=0 for h, can any body help me doing so? > > I am beginner for Mathematica.
 Murray Eisenberg murray@math.umass.edu Mathematics & Statistics Dept. Lederle Graduate Research Tower University of Massachusetts 710 North Pleasant Street Amherst, MA 010039305



