Re: plotting pdf

Hi Sara,

I was hoping that Dave might weigh in here, as I'm not familiar with
how xyYIrregularPoints is supposed to work.

But, I think there's another way you can do this.

Please see example xy_30.ncl at:

https://www.ncl.ucar.edu/Applications/xy.shtml#ex30

This shows you how to get an "irrgeular" axis using
trYIrregularPoints. It's not very trivial, unfortunately, but this
example should help.

If you already have version 6.0.0 of NCL, then you can remove the
"gsn_csm_blank_plot" function that's defined in this example, as it is
included in $NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl.

--Mary

On Dec 20, 2011, at 12:39 PM, Sara A. Rauscher wrote:

> Hi,
> I am having trouble plotting a pdf I calculated using the function
> pdfx. On the x-axis I have 120 bins of 10 mm/day each, going from 0
> to 1200 mm/day. On the y-axis is the percentage of time, which I
> would like to be equally spaced from 10 (top) to 10e-8 (bottom).
> (See the attached image from Williamson 2008). Because the values
> are extremely small or 0 for some of the bins, a log axis
> (res@trYLog = True) doesn't work. I've tried using an irregular
> axis:
>
> res@trYAxisType = "IrregularAxis"
> res@trYMinF = 10e-8
> res@trYMaxF = 10
> res@xyYIrregularPoints = (/
> 10e-8,10e-7,10e-6,10e-5,10e-4,10e-3,10e-2,10e-1,1,10/)
>
> but then I get an error message
>
> warning:_NhlCreateSplineCoordApprox: Attempt to create spline
> approximation for Y axis failed: consider adjusting trYTensionF value
> warning:IrTransInitialize: error creating spline approximation for
> trYCoordPoints; defaulting to linear
>
> which I looked up and it means the spacing of the coordinate array
> is too irregular - but that's how I need it to be. Can I get around
> this somehow?
>
>
> thanks
> sara
>
> --
> Sara A. Rauscher
> (505) 606-0512
> T-3 Fluid Dynamics
> MS B216
> Los Alamos National Lab
> Los Alamos, NM 87545 USA
>
>
> <TELA_340_f5_thumb.gif>_______________________________________________
> ncl-talk mailing list
> List instructions, subscriber options, unsubscribe:
> http://mailman.ucar.edu/mailman/listinfo/ncl-talk

_______________________________________________
ncl-talk mailing list
List instructions, subscriber options, unsubscribe:
http://mailman.ucar.edu/mailman/listinfo/ncl-talk
Received on Wed Dec 21 06:03:56 2011