VEL procedure draws a
flow) field with arrows following the field proportional in length to the field strength. Arrows are composed of a number of small segments that follow the
This routine is written in the IDL language. Its source code can be found in the file
subdirectory of the IDL distribution.
The X component at each point of the vector field.
must be a 2D array.
The Y component at each point of the vector field.
must have the same dimensions as
The number of vectors (arrows) to draw. If this keyword is omitted, 200 vectors are drawn.
X axis size as a fraction of Y axis size. The default is 1.0. This argument is ignored when !P.MULTI is set.
The length of each arrow line segment expressed as a fraction of the longest vector divided by the number of steps. The default is 0.1.
The number of shoots or line segments for each arrow. The default is 10.
A string containing the title for the plot.
X = DIST(20)
Y = SIN(X)*100
VEL, X, Y