Thanks so much, that worked perfectly!!!

So I am trying to plot this vector field:

<4x,4y,2> and use the arrow from plottools to plot these vectors because I don't like the was fieldplot3d does it.

arrow(basepoint,dir,options) is the code I am using, basically this:

arrow(vector([x,y,z]), F, .2, .4, .1, cylindrical_arrow):
where F is the field above.

 I can't seem to get this to work. Any suggestions? I am baically tying to take a field F, and create a list of vectors to plot in plot3d, but am unsure how to calculate these vectors and turn them into arrows.

Thanks much!