Reducing the number of wind vectors !!

[John Guhin]

Hi,
     I am trying to plot wind vectors at a certain level. Because of the
high resolution of the data, there are too many vectors, and the figure
becomes blurred/shaded. Using GrADS 'skip' function  I could produce a
readable  figure.  I think 'skip' function only skips gridpoints, and does
not  take into consideration the values at the skipped points.  Is this
correct?  If  yes,  how can I produce  a  legible  figure of wind vector,
which  considers all  gridpoints while drawing the vector !!
thanks.....

'open u.ctl'
'open v.ctl'
'set lon 140 200';'set lat -10 10';'set lev 200'
'set gxout vector';'set ccolor 1';'set cthick 3'
'set arrowhead 0.04';'set arrscl '0.5' '20;'set arrlab off'
'd skip(ave(u,time=20apr,time=23apr),12,12);skip(ave(v.2
,time=20apr,time=23apr))'
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