Re: overlay vector over vector

Dorita,

If both sets of vectors are in the same coordinate space, then you can use the "overlay" procedure.

You didn't say whether these were vectors that are over a map, or just vectors. If they are just vectors, then you simply create both plots and call "overlay":

vector1= gsn_csm_vector(wks,u1,v1,res1)
vector2= gsn_csm_vector(wks,u2,v2,res2)

overlay(vector1,vector2) ; vector2 is now part of vector1

draw(vector1) ; this will draw both vector1 and vector2
frame(wks)

If these are vectors over a map, then only one set of vectors can be over a map, and it must be the plot that gets overlaid on:

vector1= gsn_csm_vector_map(wks,u1,v1,res1) ; vectors over a map
vector2= gsn_csm_vector(wks,u2,v2,res2) ; vectors only
overlay(vector1,vector2) ; vector2 is now part of vector1

draw(vector1) ; this will draw both vector1 and vector2
frame(wks)

For more examples, see:

http://www.ncl.ucar.edu/Applications/overlay.shtml

--Mary

On Oct 14, 2013, at 1:01 AM, Dorita Rostkier-Edelstein <drostkier@yahoo.com> wrote:

> Hi,
> Does anybody know how to overlay two sets of vectors? I have tried to read both, etc, and I get only on the plot. I know I am missing something but don't know what.
> Thanks,
> Dorita
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Received on Mon Oct 14 08:46:02 2013