abs_d - absolute value of double
double abs -> double
-3.456 abs_d -> 3.456
implemented by C/C++
double fabs(double)
If you are not sure, if the value is of type double or integer, use
abs. If e.g. abs_d gets an integer as argument, NEST will exit throwing an
assertion.
Stroustrup 3rd ed p 660
Diesmann
27.4.1999
/var/www/debian/nest/nest-simulator-2.20.0/sli/slimath.cc