Color plays an important role in the vector plots. Different colors correspond to different directions in the vector field. This is illustrated in the color wheel portion of the upper right hand legend. The number of directions is specified by the parameter NCON . Different intensities of the same color correspond to the magnitude of the vector; darker shades correspond to smaller magnitudes, and lighter shades correspond to higher magnitudes. The correspondence between color intensity and vector magnitude is illustrated for an example color in the upper right hand legend. The parameters SMIN and SMAX are used to specify the limits of the color intensity scale for the magnitude of the vector. As with surface plots, if SMIN<SMAX, then these values are used as limits; otherwise the largest and smallest magnitudes of the vector function are used.
Three scales for the vector magnitude are available
using the option switch ISCALE.
Two line-drawing options
using LINES and seven labeling options using NUMBRS are
also available, and RMAG, CENX and CENY provide zoom-in capabilities.
The triple (NX,NY,NZ)
specifies a direction as in the case of surface plots.
In this case the function plotted is the linear interpolant of the
magnitude of the vector function
.
In this case the elements remain colored as in two dimensional vector plot.
Some examples of vector plots are given in
Figures 
-.