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polymark and filter

Dear Ferreters,

I have two questions:

(1) how can we only plot the points with values>0( positive value), by
the polymark (as below)?
go polymark poly/over/pal=gray/lev=(0,1000,10)   ilist jlist roseij
square ( ilist,jlist are indexs of variable roseij)

(2) ilist is a list values(with bad or missing in it), can we filter
out(get rid of)  the bad(or missing) values and keep a list good values
of it?

Yunyao "Frank" Qu
Computer Science Corporation (CSC)
Satellite Active Archive (SAA)
Phone:(301)763-8276 x113

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