[GRASS-user] What's wrong with this r.mapcalc usage?

[Markus Neteler]

On Jan 31, 2008 10:11 AM, Glynn Clements <glynn at gclements.plus.com> wrote:
...
> The behaviour of && and || is consistent with most other infix
> operators operators, insofar as they return null if either argument is
> null.
>
> In newer versions of r.mapcalc (I don't recall exactly which
> versions), you can use the &&& and ||| operators, which behave like &&
> and || except that they follow the common boolean equivalences:
>
>         x     &&& false = false
>         false &&& x     = false
>
>         x     ||| true  = true
>         true  ||| x     = true
>
> even when x is null.

For the record: You kindly implemented that in May 2006:
http://lists.osgeo.org/pipermail/grass-dev/2006-May/022848.html

Markus