[ncl-talk] Add/remove polymarker based on condition

[David Craig]

Hi,

I am plotting a sequence of contour maps similar to the example script 
animate_1.ncl. The data array for the contours is updated each iteration 
using setvalues. I wish to add polymarkers to the maps based on a 
condition being true in a particular iteration and remove them if the 
condition is not through. Is it possible to do this using setvalues or 
should I be redrawing the entire map each iteration??

thanks in advance
Dave