[Matplotlib-users] Basemap - quiver scaling

[James B. <bo...@ll...>]

when I call quiver in the Basemap toolkit, the scale keyword has the  
effect of eliminating all vectors, no matter what value I assign  
(except None).
I am using matplotlib 0.87.3 -  Basemap 0.9
In any case the exact effect of the scale parameter is obscure - how  
does is scale? units/inch, units/gridbox ???

Thanks for any help.
--Jim


the calls I use are below:
mercMap =  
Basemap(llcrnrlon=120.,llcrnrlat=-20,urcrnrlon=200.,urcrnrlat=20.,\
             resolution='c',area_thresh=10000.,projection='merc',\
             lon_0=160.,lat_ts=0.)
istride = 3
mercMap.quiver(x[::istride,::istride],y[::istride,::istride],uERA[:: 
istride,::istride],vERA[::istride,::istride],scale=None)