# [ncl-talk] drawing RMS semi-circles in Taylor diagram

Alan Brammer abrammer at albany.edu
Wed Jun 3 09:40:14 MDT 2015

```I would say you want to edit the constants on the below lines.  I'm not
sure how these were obtained though, trial and error might be the simplest
way.
These are just restricting how long the line is, with your base plot I
would think that even your 3rd circle can span the full 180-360. Increase
0.77 and 0.61 until the circles reach a respective edge.
n3 = floattointeger( 0.77*npts )
n4 = floattointeger( 0.61*npts )

Good luck.

On 3 June 2015 at 09:43, LI Qi <liqi123sh at qq.com> wrote:

> Dear NCL developers,
>
> I use the script "taylor_diagram.ncl" to draw Taylor diagram. I extend the
> outer curve from the original 1.65 to 1.75 to fit my data, but it seems
> that the parameters w.r.t. RMS semi-circles need also be changed
> accordingly (as is shown below, the semi-circles are incomplete).
> The issue is, I have no idea how to change it.
>
>
> Below is a snippet of the script, which I guess is related to the RMS
> semi-circles
> Any hints about how to change the parameters would be sincerely
> appreciated!
>
> Best,
> Qi
>
> dx   = 0.25
>       ncon = 4                                       ; 0.75, 0.50, 0.25,
> 0.0
>       npts = 100                                     ; arbitrary
>
>       dum9 = new(ncon,graphic)
>
>       do n=1,ncon
>          rr  = n*dx            ; radius from 1.0 [OBS] abscissa
>          xx  = 1. + rr*cos(ang)
>          yy  = fabs( rr*sin(ang) )
>          if (n.le.2) then
>          end if
>          if (n.eq.3) then
>              n3 = floattointeger( 0.77*npts )
>              dum9(n-1) =
>          end if
>          if (n.eq.4) then
>              n4 = floattointeger( 0.61*npts )
>              dum9(n-1) =
>          end if
>       end do
>
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