[GRASS-user] use pi number

[José María Michia]

2008/8/23 Glynn Clements <glynn en gclements.plus.com>:

> r.mapcalc doesn't have a definition for pi; you'll need to enter a
> literal value.

Thanks Glynn. This sounds like a weak point for me.

I need to introduce "Pi" several times. Not for converting degrees to
radians. It is another class of applications. In this case to
calculate gravity anomalies.

Is it possible to define variables? I can not find a way and I am not
convinced having to use the literal value ever need to use IP.

Thank you for your help.
Jose Maria