Nsum Keyword

Used With Routines: OPLOT, PLOT

Corresponding System Variable: !P.Nsum

Indicates the number of data points to average when plotting.

• If Nsum is larger than 1, every group of Nsum points is averaged to produce one plotted point. If there are m data points, then m/Nsum points are displayed. On logarithmic axes a geometric average is performed.

It is convenient to use Nsum when there is an extremely large number of data points to plot because it plots fewer points, the graph is less cluttered, and it is quicker.