These functions compute miscellaneous mathematical functions.
The naming follows the standard for computer languages such as C
or Fortran. - a numeric or complexvector or array. These are
internal generic primitive functions: methods can be defined for
them individually or via the Math group generic. For complex
arguments (and the default method), abs(z) == Mod(z) and sqrt(z)
== z^0.5. Both are S4 generic and members of the Math group
generic. Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988)
The New S Language. Wadsworth & Brooks/Cole. ‘plotmath’ for the
use of sqrt in plot annotation. Documentation reproduced from R
2.15.3. License: GPL-2.