pst-math – En­hance­ment of PostScript math op­er­a­tors to use with pstricks

PostScript lacks a lot of ba­sic op­er­a­tors such as tan, acos, asin, cosh, sinh, tanh, acosh, as­inh, atanh, exp (with e base). Also (oddly) cos and sin use ar­gu­ments in de­grees.
Pst-math pro­vides all those op­er­a­tors in a header file pst-math.pro with wrap­pers pst-math.sty and pst-math.tex.
In ad­di­tion, sinc, gauss, gam­maln and bessel are im­ple­mented (only par­tially for the lat­ter). pst-math is de­signed es­sen­tially to work with pst-plot but can be used in what­ever PS code (such as pstricks Spe­cialCoor "!", which is use­ful for plac­ing la­bels).
The pack­age also pro­vides a rou­tine SIMPSON for nu­mer­i­cal in­te­gra­tion and a solver of lin­ear equa­tion sys­tems.