[ncl-talk] Add polyline, polygon, and polytext to a map generates two PNG files.

[Wei Huang]

I am trying to add polyline, polygon, and polytext to a map, steps as below:

  res = ...
  wks = ...
   map = gsn_csm_map(wks, res)

 ;add lots of polylines, polygons, and polytexts to map

draw(map)
 frame(wks)

It generates two PNG files. With the first just a map.

How can I remove the first blank map?

Thanks,

Wei Huang
whuang at univ-wea.com