A sequence of calls to draw a curve (a call to FRSTD followed by one or more calls to VECTD) may be followed by a call to LASTD. It flushes any portions of smoothed curves that are defined by coordinates saved in internal buffers of FRSTD and VECTD and that have not yet been drawn. Calls to LASTD are not always required - for example, when a non-smoothing version of Dashline is used (no buffering) or when the next call to an NCAR Graphics routine will be to FRSTD (which flushes the buffers) - but unnecessary calls do no harm. If you judge that one of the smoothing versions of Dashline may be used, it is best to put in the calls to LASTD.
Use the ncargex command to see the following relevant examples: tdashp, tdashs.
To use LASTD or c_lastd, load the NCAR Graphics libraries ncarg, ncarg_gks, and ncarg_c, preferably in that order.
Online: dashline, dashline_params, curved, dashdb, dashdc, frstd, lastd, lined, reset, ncarg_cbind
Hardcopy: NCAR Graphics Contouring and Mapping Tutorial; NCAR Graphics Fundamentals, UNIX Version; User's Guide for NCAR GKS-0A Graphics
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University Corporation for Atmospheric Research
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