[R-sig-Geo] formula understanding

[Edzer Pebesma]

On 02/24/2011 09:40 PM, Anna Gretschel wrote:
> Dear List,
> 
> The following formula is given for a spherical model in variofit (geoR).
> 
> /rho(h) = 1 - 1.5 * (h/phi) + 0.5(h/phi)^3 if h < phi , 0 otherwise
> 
> /Could anyone explain what the term "if h<phi, 0 otherwise" means? Which 
> part of the equation becomes 0 if h>phi?

rho(h)

> And shouldn't there be a * between 0.5 and (h/phi)?

That would have been consistent, but as this is documentatation, I don't
think it is wrong.

> Thanks in advance,
> Anna
> 
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> 
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-- 
Edzer Pebesma
Institute for Geoinformatics (ifgi), University of Münster
Weseler Straße 253, 48151 Münster, Germany. Phone: +49 251
8333081, Fax: +49 251 8339763  http://ifgi.uni-muenster.de
http://www.52north.org/geostatistics      e.pebesma at wwu.de