[pythag0ra5]

Hi there,

can someone tell me if it is possible to calculate the arctan of some value in the M4 Preproccesor?

define(height_step, 1.5)
define(length_step, 3)
define(alpha, calc(atan(height_step/length_step)))

If i compile my m4-file with

m4 blockMeshDict.m4 > blockMeshDict

an error occurs:

Undefined subroutine &main::atan called at -e line 1.

In the final blockmeshdict nothing is calculated.

Can someone help?

Thanks a lot in advance!

[pythag0ra5]

Thanks a lot to startingwithCFD who gave the right hint, some perl-information was missing in the header:

define(calc, [esyscmd(perl -e 'use Math::Trig; print ($1)')]) dnl>