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Re: how to create a LOG array from A to B [message #78988]

Fri, 13 January 2012 13:32

Mark Piper
Messages: 198
Registered: December 2009

Senior Member

On 1/12/2012 2:43 PM, nata wrote:
> I got it !
>
> a=1.5
> b=5.45
> N=20
>
> elev=FINDGEN(N)*(ALOG10(b)-ALOG10(a))/(N-1)+ALOG10(a)
> elev=10.^elev
>
> PLOT, elev, REPLICATE(1,N), YR=[0,2], XR=[a,b], /XLOG, /XS, /YS,
> PSYM=7
>
> nata

I know I'm late with this, but several years ago I wrote a routine for
just this purpose. Get it here:

http://www.exelisvis.com/Default.aspx?tabid=1540&id=1231

Example:

IDL> a = findgen_alog10(5.4, 56.8, 10)
IDL> print, a
5.40000 7.01365 9.10950 11.8316 15.3672
19.9593 25.9237 33.6703
43.7318 56.8000
IDL> plot, a, a, /xlog, /ylog, psym=5

mp

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[Message index]

		Re: how to create a LOG array from A to B By: Mark Piper on Fri, 13 January 2012 13:32
		Re: how to create a LOG array from A to B By: natha on Thu, 12 January 2012 13:43
		Re: how to create a LOG array from A to B By: manodeep@gmail.com on Thu, 12 January 2012 13:50
		Re: how to create a LOG array from A to B By: natha on Thu, 12 January 2012 13:41
		Re: how to create a LOG array from A to B By: natha on Thu, 12 January 2012 12:05
		Re: how to create a LOG array from A to B By: Michael Galloy on Thu, 12 January 2012 11:52

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