[ncl-talk] Fwd: Pressure vs. height of temperature - warning:IrTransInitialize: trXCoordPoints contains invalid coordinate array: defaulting trXAxisType to LinearAxis

[David Warner]

Dear NCL users,

I am using gsn_csm_pres_hgt to draw pressure vs. height plot. My time axis
values are ranging from [1024536..1024638], however I would like to replace
them in the following date format 2017120100 (YMDH).  I tried using
"cd_calendar (tim,-3)" to make the date conversion. But I encounter the
following error when I tried to plot:

warning:IrTransInitialize: trXCoordPoints contains invalid coordinate
array: defaulting trXAxisType to LinearAxis
warning:_NhlCreateSplineCoordApprox: Attempt to create spline approximation
for X axis failed: consider adjusting trXTensionF value
warning:_NhlCreateSplineCoordApprox: Attempt to create spline approximation
for X axis failed: consider adjusting trXTensionF value
warning:_NhlCreateSplineCoordApprox: Attempt to create spline approximation
for X axis failed: consider adjusting trXTensionF value
fatal:IrTransInitialize: spline coordinate approximation not possible:
fatal:Unable to initialize layer-Can't Create
fatal:ContourPlotInitialize: Error creating transformation object
fatal:ContourPlotInitialize: error setting up transformation
fatal:Unable to initialize layer-Can't Create
fatal:Unable to access object with id:-4
fatal:PID #-4 can't be found in NhlSetValues
fatal:NhlGetValues:PID #-4 is invalid
fatal:["Execute.c":8637]:Execute: Error occurred at or near line 2212 in
file /usr/local/ncl-6.6.2/lib/ncarg/nclscripts/csm/gsn_code.ncl

fatal:["Execute.c":8637]:Execute: Error occurred at or near line 10216 in
file /usr/local/ncl-6.6.2/lib/ncarg/nclscripts/csm/gsn_code.ncl

fatal:["Execute.c":8637]:Execute: Error occurred at or near line 13414 in
file /usr/local/ncl-6.6.2/lib/ncarg/nclscripts/csm/gsn_csm.ncl

fatal:["Execute.c":8637]:Execute: Error occurred at or near line 13553 in
file /usr/local/ncl-6.6.2/lib/ncarg/nclscripts/csm/gsn_csm.ncl

fatal:["Execute.c":8637]:Execute: Error occurred at or near line 13832 in
file /usr/local/ncl-6.6.2/lib/ncarg/nclscripts/csm/gsn_csm.ncl

fatal:["Execute.c":8637]:Execute: Error occurred at or near line 39 in file
warm_core.ncl

I am attaching my script and the test figure(without making the date
conversion). How to rectify this error to assign the desired time axis
along x-axis?

*; print output:*

Variable: f
Type: file
filename: tanom
path: tanom.nc
   file global attributes:
      history : PyFERRET V7 (opt)  5-Aug-19
      Conventions : CF-1.6
   dimensions:
      LV_ISBL0 = 46
      bnds = 2
      TAX = 18  // unlimited
   variables:
      float LV_ISBL0 ( LV_ISBL0 )
         units : pa
         long_name : Isobaric surface
         point_spacing : uneven
         axis : Z
         bounds : LV_ISBL0_bnds
         standard_name : altitude

      float LV_ISBL0_bnds ( LV_ISBL0, bnds )

      double TAX ( TAX )
         units : hours since 1901-01-15 00:00:00
         axis : T
         calendar : GREGORIAN
         time_origin : 15-JAN-1901
         standard_name : time

      double ANM ( TAX, LV_ISBL0 )
         missing_value : -9.999999999999999e+33
         _FillValue : -9.999999999999999e+33
         long_name : TEMP[D=1,X=74.2,Y=8.7]-T_REF
         long_name_mod : X=61.5E:86.5E, Y=3.9S:21.1N



Variable: tim
Type: double
Total Size: 144 bytes
            18 values
Number of Dimensions: 1
Dimensions and sizes: [TAX | 18]
Coordinates:
            TAX: [1024536..1024638]
Number Of Attributes: 5
  units : hours since 1901-01-15 00:00:00
  axis : T
  calendar : GREGORIAN
  time_origin : 15-JAN-1901
  standard_name : time
(0) 1024536
(1) 1024542
(2) 1024548
(3) 1024554
(4) 1024560
(5) 1024566
(6) 1024572
(7) 1024578
(8) 1024584
(9) 1024590
(10) 1024596
(11) 1024602
(12) 1024608
(13) 1024614
(14) 1024620
(15) 1024626
(16) 1024632
(17) 1024638

Variable: temp
Type: double
Total Size: 5760 bytes
            720 values
Number of Dimensions: 2
Dimensions and sizes: [tim | 18] x [lev | 40]
Coordinates:
            tim: [2017120100..2017120506]
            lev: [100000..5000]
Number Of Attributes: 5
  units : K
  missing_value : -9.999999999999999e+33
  _FillValue : -9.999999999999999e+33
  long_name : Temperature Perturbation
  long_name_mod : X=61.5E:86.5E, Y=3.9S:21.1N


Variable: tim (coordinate)
Type: double
Total Size: 144 bytes
            18 values
Number of Dimensions: 1
Dimensions and sizes: [tim | 18]
Coordinates:
Number Of Attributes: 5
  calendar : GREGORIAN
  units : hours since 1901-01-15 00:00:00
  axis : T
  time_origin : 15-JAN-1901
  standard_name : time
(0) 2017120100
(1) 2017120106
(2) 2017120112
(3) 2017120118
(4) 2017120200
(5) 2017120206
(6) 2017120212
(7) 2017120218
(8) 2017120300
(9) 2017120306
(10) 2017120312
(11) 2017120318
(12) 2017120400
(13) 2017120406
(14) 2017120412
(15) 2017120418
(16) 2017120500
(17) 2017120506


Thanks and regards.
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