[ncl-talk] warning:_NhlCreateSplineCoordApprox: Attempt to create spline approximation for X axis failed: consider adjusting trXTensionF value

[Dennis Shea]

As noted in the warning message:
    You may want to set gsnAddCyclic to False to avoid a warning

---
[1]
    res at gsnAddCyclic= False

Generally, always  include a:          printVarSummary( PCP)

I speculate the variable is:        PCP(LAT,LON1_1441)    ; (400,1441)

The 1441 would indicate that the cyclic data value has *been included* on
the file.
        3B42 data have dimension sizes TRMM_3B42(400,1440).

[2] Why are you doing the following?

pcp_sum=dim_sum_n(pcp(0:8,:,:),0)
pcp_sum!0="lat"
pcp_sum!1="lon"
pcp_sum&lat=lat(0:399)
pcp_sum&lon=lon(0:1440)
printVarSummary(pcp_sum)

You should use the _Wrap version for cleaner code.

    pcp_sum=dim_sum_n_Wrap(pcp(0:8,:,:),0)
    printVarSummary(pcp_sum)

The named dimension 'lat,lon' are *not* necessary.

[3]
NCL 6.2.0 was released over 3 years ago. There have been many new features
and improvements. I suggest you upgrade to 6.4.0

[4]
The current release of NCL 6.4.0
   http://www.ncl.ucar.edu/current_release.shtml

has an associated User Guide with many examples. I suggest that you look at
it.

http://www.ncl.ucar.edu/Document/Manuals/NCL_User_Guide/

Good Luck


On Sat, Apr 8, 2017 at 4:45 AM, grace <313695096 at qq.com> wrote:

> Hi:
>   All,I have write a script to read and trmm 3B42 data ,but it appears
> warning :
>
>  (0)     gsn_add_cyclic: Warning: The range of your longitude coordinate
> array is at least 360.
> (0)     You may want to set gsnAddCyclic to False to avoid a warning
> (0)     message from the spline function.
> warning:_NhlCreateSplineCoordApprox: Attempt to create spline
> approximation for X axis failed: consider adjusting trXTensionF value
> warning:IrTransInitialize: error creating spline approximation for
> trXCoordPoints; defaulting to linear
>
> And there is no contour appeared on the plot
>
> This is my script:
>    ;
> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
> load "$NCARG_ROOT/lib/ncarg/nclscripts/wrf/WRFUserARW.ncl"
>
> begin
>
>   a = addfile("/backup/hl/z_20min/2010.nc","r")
>
>
> ; We generate plots, but what kind do we prefer?
> ;  type = "x11"
>   type = "pdf"
> ; type = "ps"
> ; type = "ncgm"
>   wks = gsn_open_wks(type,"trmmPrecip2010_0808")
> ; get data
> pcp  = a->PCP
> lat  = a->LAT
> lon  = a->LON1_1441
> pcp_sum=dim_sum_n(pcp(0:8,:,:),0)
>
> pcp_sum!0="lat"
> pcp_sum!1="lon"
> pcp_sum&lat=lat(0:399)
> pcp_sum&lon=lon(0:1440)
> printVarSummary(pcp_sum)
>
> ;printVarSummary(pcp1)
>
> ; Set some basic resources
> res = True
>   res at gsnDraw  = False
>   res at gsnFrame = False
>  res at cnLinesOn = False
> res at lbLabelBarOn        = False
> res at cnInfoLabelOn       = False
> res at cnLineLabelsOn      = False
> res at mpPerimOn   = True
> res at gsnMaximize=True
> res at pmTickMarkDisplayMode   = "Always"
> res at gsnDraw   = False        ; don't draw yet
> res at gsnFrame  = False
>
> res at mpGeophysicalLineColor = "Black"
> res at mpNationalLineColor    = "Black"
> res at mpDataSetName         = "Earth..4"
> res at mpDataBaseVersion     = "MediumRes"
> res at mpOutlineSpecifiers = ("China:states")
> res at mpNationalLineThicknessF= 0.1
> res at mpOutlineDrawOrder    = "PostDraw"
> res at mpLimitMode = "LatLon"    ; Limit the map view.
> res at mpMinLonF   = 104.8
> res at mpMaxLonF   = 112
> res at mpMinLatF   = 31.9
> res at mpMaxLatF   = 39.3
>
>  plot=gsn_csm_contour_map(wks,pcp_sum,res)
>        shp_name    = "/public/home/huanglei/map/shaanxi_city_l.shp"
>        lnres                  = True
>         lnres at gsLineColor      = "black"
>         lnres at gsLineThicknessF = 1.5
>  id = gsn_add_shapefile_polylines(wks,plot,shp_name,lnres)
>
>   txres2  = True
>    txres2 at txFont  = 10
>    txres2 at txFontHeightF =0.01
>    txres2 at txFontColor = "Blue"
>    txdum1 =gsn_add_text(wks, plot, "Xian", 108.93,34.27, txres2)
>   draw(plot)
>   frame(wks)
>   delete(res)
> ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
>
>
> end
>
>
> My NCL version is 6.2.0.
>  How can I slove the problem?
>
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