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Re: what am I doing wrong? [message #3586]

Fri, 17 February 1995 13:50

jeyadev
Messages: 78
Registered: February 1995

Member

In article <3i0pg0$rf@atom.ansto.gov.au>,
Babak Ardekani <babaka@atom.ansto.gov.au> wrote:
> Dear Netters,
>
> I'm trying to plot the funtion:
>
> f(x)=x*log(x/w)-x (x>0,w>0)
>
> using PV~WAVE.
>
> I know that this function has a minimum at x=w.
>
> ............
>
> THE PROBLEM IS that when I plot this function in PV~WAVE
> the minimum appears at another point.
>
> I'm using the following set of commands:
>
> WAVE> w=5.0
> WAVE> x=INDGEN(400)
> WAVE> x=x+0.1 + 0.01 ; x goes from 0.01 to 40.01
> WAVE> fx=x*ALOG10(x/w)-x
^^

That's what is wrong. Use ALOG(x/w) - the natural logrithm.

> WAVE> PLOT,x,fx
>
> I would appreciate if you would tell me what I'm doing
> wrong?

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[Message index]

		Re: what am I doing wrong? By: jeyadev on Fri, 17 February 1995 13:50
		Re: what am I doing wrong? By: babaka on Thu, 16 February 1995 23:09
		Re: what am I doing wrong? By: babaka on Thu, 16 February 1995 16:27

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