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Data points can be presented either by symbols or by connecting lines
with the routine PCDATA (PTDATA) . The
coordinates of the data ponits are expected to refer to the current
graphic mode, i.e. USER (world) coordinates or NORMalized (clip) coordinates. PCDATA (PTDATA) connects
the data points with lines if the line type is not equal to zero, else
it will present the data points with symbols. PCDATA (PTDATA) produces a simple staircase if the bin mode flag is set.
Data can also be represented by a histogram using PCHIST (PTHIST).
It offers some sophisticated options so you can draw a histogram according
to your taste.