<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><DIV>Hi, Ladies and Gentlemen, thanks for your replies . I know the SKIP function can reduce the grid number to diaplay. I mean how to reduce the arrow numbers with no grid skipped. <BR></DIV>
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<B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Andreas Schneider <cujyaz@GOOGLEMAIL.COM><BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> GRADSUSR@LIST.CINECA.IT<BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Wednesday, August 19, 2009 8:45:54 AM<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B> Re: How to control the streamline?<BR></FONT><BR>On Wed, Aug 12, 2009 at 2:38 PM, Jennifer Adams<<A href="mailto:jma@cola.iges.org" ymailto="mailto:jma@cola.iges.org">jma@cola.iges.org</A>> wrote:<BR>> There are no specific controls for the arrows in the streamlines. I'll put<BR>> it on my list of requested features.<BR><BR>I have a patch for gxstrm.c (almost a complete rewrite). It includes<BR>support for arrowhead size and changes strmden behavior to be less<BR>dependent on data density and geographic location.<BR><BR>Its main purpose is to fix the erroneous streamlines. In current GrADS<BR>they are generally wrong,
especially near the poles, because they<BR>assume square grid boxes everywhere. With the patch, streamlines<BR>become usable with the nps and sps projections.<BR><BR>The patch includes performance optimizations, but may actually run<BR>slower because of higher precision and a more sophisticated algorithm.<BR><BR>The patch is based on 2.0.a2. I planned to do more code clean-up,<BR>tests and maybe more enhancements (good default density for all map<BR>projections and all locations, nicer positions for arrow heads, ...),<BR>but didn't find time to actually do it. I ran the patched a2 for a<BR>year without problems (but I generate similar maps most time).<BR><BR>The attached version of the patch is adapted to 2.0.a7.1, but I don't<BR>even know if it compiles, because the GrADS build system isn't easy<BR>and I got errors at bootstrap that weren't resolvable for now.<BR><BR>Andreas<BR></DIV></DIV></div><br>
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