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Re: about the blackbody radiation curve [message #72373]

Fri, 03 September 2010 06:52

Paul Van Delst[1]
Messages: 1157
Registered: April 2002

Senior Member

Wox wrote:
>
> Do something like
>
> y=a/(exp((h*c)/(k*x*t))-1)
> ind=where(x eq 0,ct)
> if ct ne 0 then y[ind]=0

I would recommend checking stuff before the calculation is done:

; Check values
loc = WHERE(x LT Tolerance OR FINITE(x) EQ 0, count)
IF ( count GT 0 ) THEN $
MESSAGE, 'Input X-values < or = 0.0, NaN, or Inf found.'

where "Tolerance" is the eps output from MACHAR. One should avoid floating point equality tests.

cheers,

paulv

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[Message index]

		Re: about the blackbody radiation curve By: Paul Van Delst[1] on Fri, 03 September 2010 06:52
		Re: about the blackbody radiation curve By: Wout De Nolf on Fri, 03 September 2010 05:36
		Re: about the blackbody radiation curve By: mankoff on Thu, 02 September 2010 22:40

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