parea                   Polygonal Area
pconvex                 Convex verification
pcorr                   Polygonal symbolic correlation
pcov                    Polygonal symbolic covariance
pfreq                   Polygonal Symbolic Relative Frequency
plr                     Polygonal linear regression
pmean                   Polygonal empiric mean
pmean_id                Polygonal symbolic internal mean
pplot                   Plot polygonal symbolic variable
psim                    Polygonal symbolic data simulation
psmi                    Polygonal internam second moment
ptransform              Polygon data transformation
pvar                    Polygonal symbolic variance
pvari                   Polygonal internal variance
