[GRASS-user] use pi number
Glynn Clements
glynn at gclements.plus.com
Sat Aug 23 04:54:00 EDT 2008
José María Michia wrote:
> r.mapcalc 'prueba = pi()'
> r.mapcalc 'prueba = pi'
> r.mapcalc 'prueba = PI()'
> r.mapcalc 'prueba = PI'
>
> With the following results:
>
> Syntax error
>
> Is this normal? Is IP defined within GRASS / r.mapcalc?
r.mapcalc doesn't have a definition for pi; you'll need to enter a
literal value.
Note that all of r.mapcalc's trigonometric functions accept or return
angles measured in degrees, so you don't need to explicitly multiply
or divide by pi/180.
--
Glynn Clements <glynn at gclements.plus.com>
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