Re: Legend on xy plots with multiple lines

Xin,

You can set the line patterns yourself using
the "xyDashPatterns" resource, and that
way know exactly which line patterns to
use in the legend:

res@xyDashPatterns = (/2,3,4/) ; just an example
. . .
plot = gsn_csm_xy(wks,x,y,res)

lgres = True
. . .
lgres@lgDashIndexes = (/2,3,4/) ; or you can use lgres@lgDashIndexes = res@xyDashPatterns
lgres@lgMonoDashIndex = False

Or, you can retrieve the value of "xyDashPatterns" from
the XY plot, and use this in your legend:

plot = gsn_csm_xy(wks,x,y,res)

getvalues plot@dataspec
  "xyDashPatterns" : dash_patterns
end getvalues

. . .

lgres@lgDashIndexes = dash_patterns
lgres@lgMonoDashIndex = False

See example "leg_13.ncl" at:

http://www.ncl.ucar.edu/Applications/legend.shtml

This example is a bit lengthy, but it shows how to get information
from an XY plot so you can reconstruct a legend from scratch.

--Mary

On Sep 3, 2013, at 9:43 AM, Xin Xi wrote:

> Hello,
> I am plotting multiple lines on a xy plot with two y axes, and use gsn_create_legend to attach a legend to the plot. I donot know how to make the line patterns in the legend consistent with the line plot. See attached script and figure. Any help is much appreciated.
> Thanks.
> Xin
>
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Received on Tue Sep 3 11:30:44 2013