It looks like quiver might be able to what I want.
However, I have a few more questions. Assume the form
QUIVER( X, Y, U, V, S)
I see from the on-line documentation that:
"color can be an array of colors in which case the arrows can be
colored according to another dataset."
What is an array of colors? I want to make vectors one color if an element of U is negative and another color if it is zero or positive.
I want to make several plots, i.e a series of png or ps files, and have a vector with magnitude N be the same size on each plot. Is this what setting S equal to zero is supposed to accomplish?
Ms. Carol A. Leger
SRI International Phone: (650) 859-4114
333 Ravenswood Avenue G-273
Menlo Park, CA 94025 e-mail: leger@...392...