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Topic: a simple question
Replies: 4   Last Post: Sep 27, 2013 2:31 AM

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Murray Eisenberg

Posts: 2,105
Registered: 12/6/04
Re: a simple question
Posted: Sep 24, 2013 4:07 AM
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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 upper-case letter -- because that risks confounding them with the names of built-in objects.

On Sep 23, 2013, at 9:59 PM, Dhaneshwar Mishra <> 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
Mathematics & Statistics Dept.
Lederle Graduate Research Tower
University of Massachusetts
710 North Pleasant Street
Amherst, MA 01003-9305

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