[ncarg-talk] Regarding Panel Plot of the Overlaid XY Plot

Thu Nov 1 15:30:10 MDT 2018

In the future, please post NCL questions to ncl-talk at ucar.edu.  ncl-install
is for installation issues.

You have several errors in your script:

[0] You are using "draw" as variable name.  "draw" is a reserved keyword in
NCL, because it's a procedure that you call to draw plots. Hence you can't
use it as a variable name. However, this variable is not really needed as I
think you are creating more plots than you need to. Instead of calling
gsn_csm_xy and gsm_csm_xy2 and overlaying the two plots, I think all you
need is to call:

plot1=gsn_csm_x2y2(wks,tmean_yfrac,raf_yfrac,tmeann,raf,resmn,resr)

However, note that I have created two variables: tmean_yfrac and raf_yfrac.
I converted the "time" variable of both variables to be a fractional year
value, and noticed the two arrays were different, so you have to be careful
about plotting them using a common "time" variable.  Using gsn_csm_x2y2
allows me to specify a unique X and Y array for both curves.

[1] You can't have a space after the "@" sign when setting attributes:

 resmn@ tmXUseBottom =False

This should be:

 resmn at tmXUseBottom =False

[2] These lines are wrong:

 draw(1)=gsn_csm_xy2(wks,yyyy,tmeann,raf,resmn,resr)
 overlay(plot(1),draw(1))
 plot(1)

First, the "draw" variable will have been renamed to "plot2". Second, just
calling "plot(1)" makes no sense. I think what you wanted was:

 plot2(1)=gsn_csm_xy2(wks,yyyy,tmeann,raf,resmn,resr)
 overlay(plot(1),draw(1))
 draw(plot(1))

[3] If you are trying to put two plots in a panel, then they must both have
the same "wks" variable associated with it. There's no reason to create two
separate workstations.

[4] When you call gsn_panel, you only want to give it the plots you want to
panel. You passed in "plot" which consists of two base plots and two
overlaid plots.  You can't draw plots once they've been overlaid, so what
you want is:

gsn_panel(wks,(/plot(1),plot(3)/),(/1,2/),False)

[5] You are getting a number of warnings when you run the script, because
you are setting resources that have no meaning for the type of plot being
created. For example, you set "gsMarkerIndex", but this resource is only
good for when you are adding markers to a plot via "gsn_polymarker" or
"gsn_add_polymarker".  If you are trying to set a marker for an XY plot,
then this should be:

resmn at xyMarker = 1
resr at xyMarkLineMode = "MarkLines"

I set xyMarkLineMode to "MarkLines" because otherwise you will only get
lines.  If you only want markers, then set:

resr at xyMarkLineMode = "Markers"

[6] There are no resources called "tbXMaxF" or "tbXMinF".  I think you
meant "trXMaxF" and "trXMinF".

You need to be careful about resource misspellings. NCL will tell you if it
doesn't recognize a resource you are setting, with this kind of warning:

warning:tbXminF is not a valid resource in overlay_chamba_and_kangra_plots_xy
at this time

[7] The rest aren't really errors, but things I did to clean up the plot

- I set vpWidthF and vpHeightF so that you get a plot that is wider than it
is high.  This is usually done for time series plots. If you don't like
this, simply remove or comment all lines with these resources, and you will
get the default square plot.

 - I changed the panel so that the two plots are being drawn in two rows
and one column.

 - I set some other resources to turn off the top labels and tickmarks.

 - I changed the color of the Y axis strings to match the color of their
corresponding curves. This was mainly for me, to make sure I had the
correct curve with the correct axis.

 - I noticed you are setting resr and resmn resource lists twice and
setting them to exactly the same thing, with the exception of the main
title (tiMainString). I removed the duplicate settings to clean things up.

- I reorganized the resources so they are hopefully easier to read and
modify later.

 - You may want to set trYMinF / trYMaxF for one or both axes depending on
how you want the two curves displayed relative to each other.

See the attached modified script and resultant plot.

If you continue to have problems, please post them to ncl-talk. You must
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http://mailman.ucar.edu/mailman/listinfo/ncl-talk

--Mary

On Tue, Oct 30, 2018 at 10:26 PM, Atul Saini <atulsainimail at gmail.com>
wrote:

> Respected Sir/Ma'am,
>                        It is my humble request to guide me in the
> following issue.
>
> Sir/Ma'am, I am overlaying xy plot {  plot (2) over plot(1) and plot(3)
> over plot(4)   }  and then trying to get plot(1) and plot (3) in the panel
> plot.
>
> The NCL code along with the required data files for the purpose are
> attached herewith this mail.
>
> *I don't know what is the problem with the code, please help .*
>
>
>
>
> Regards,
>
>
>
>
> _______________________________________________
> ncarg-talk mailing list
> ncarg-talk at ucar.edu
> http://mailman.ucar.edu/mailman/listinfo/ncarg-talk
>
>
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