Re: Error in "gsn_add_shapefile_polylines" procedure

Hi Noel,

The issue is that gsn_add_shapefile_polylines() returns an array with IDs for each polyline generated from a single invocation. What you really need is an array of length 12, where each element is an array returned from gsn_add_shapefile_polylines, each of which are of different sizes. To the best of my knowledge, that's not possible in NCL.

However, I think (never done this) you might be able to use a list as the outer container for your 12 variably-lengthed arrays. You'd do something like:

   maps = NewList("fifo") ; or "lifo", shouldn't much matter for this usage

and then inside your panel-loop:

  ListPush(maps, gsn_add_shapefile_polylines(…..))

and then finally, rather than "draw(maps)", I think you'd have to iterate over the list and call draw on each element one at a time; something like:

  do i=1,ListCount(maps)
    draw(ListPop(maps))
  end do

I hope that helps; let us know if not…
Rick

On Dec 3, 2012, at 5:16 PM, Noel Aloysius <noel.aloysius@gmail.com> wrote:

> Hi NCL,
>
> I created a panel plot with 12 maps using "gsn_csm_contour_map_ce". I now want to overlay a poly-line shape file on every plot.
>
> I presume I will have to specify an object to hold the 12 plots after overlying the map with "gsn_add_shapefile_polylines". When I tried, the following error is thrown,
>
> "fatal:Dimension sizes on right hand side of assignment do not match dimension sizes of left hand side"
>
> Obviously I am not specifying the object correctly.
>
> I will appreciate your help.
>
> The script is attached.
>
> Thank you in advance,
> Noel
>
>
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Received on Tue Dec 4 10:37:56 2012