[ncl-talk] The result of the conditional expression yields a missing value (mjoclivar_15)

[reza tisa]

Hello all NCL user, i am running mjoclivar_15 and got this error messages:
Error Message :
*fatal:The result of the conditional expression yields a missing value. NCL
can not determine branch, see ismissing function*






*fatal:["Execute.c":8637]:Execute: Error occurred at or near line 3836 in
file
$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.nclfatal:["Execute.c":8637]:Execute:
Error occurred at or near line 4143 in file
$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.nclfatal:["Execute.c":8635]:Execute:
Error occurred at or near line 110*
*This is my data:*
MJO_PC_INDEX.nc (i got from running mjoclivar_14):
https://drive.google.com/open?id=1pr6wTdRXE0AWaPbh-Q8wWHca8NZLTLQw
My mjoclivar_15 script:
https://drive.google.com/open?id=1uvljzKOnCZt2vqso1fPPxLqCD1R9FBq2

*Error line:*
................
ncl 106> gsn_define_colormap(wks,"radar_1")
ncl 107>       end if
ncl 108>                                                     ; color
changes w month
ncl 109>       plLine at gsLineColor = colMonth(imon(nt)-1)     ; -1 is cuz
NCL is 0-based
*ncl 110>       plot@$unique_string("dum")$ = gsn_add_polyline(wks, plot,
(/xBegin,pc1(nt)/), (/yBegin,pc2(nt)/), plLine)*
ncl 111>
ncl 112>       if (label_opt.eq.0) then
ncl 113>
...................

*printVarSummary from MJO_PC_INDEX.nc :*
ncl 6> printVarSummary(T) *;PC1*
Variable: T
Type: float
Total Size: 5844 bytes
            1461 values
Number of Dimensions: 1
Dimensions and sizes: [time | 1461]
Coordinates:
            time: [1884648..1919688]
Number Of Attributes: 5
  info : PC1/stddev(PC1)
  long_name : PC1
  ts_mean : ( 4.944145e-09, -3.424131e-09 )
  matrix : covariance
  _FillValue : 32766

ncl 8> printVarSummary(T2) *;PC2*
Variable: T2
Type: float
Total Size: 5844 bytes
            1461 values
Number of Dimensions: 1
Dimensions and sizes: [time | 1461]
Coordinates:
            time: [1884648..1919688]
Number Of Attributes: 5
  info : PC2/stddev(PC2)
  long_name : PC2
  ts_mean : ( 4.944145e-09, -3.424131e-09 )
  matrix : covariance
  _FillValue : 32766

ncl 11> printVarSummary(T2)  *;MJO_INDEX*
Variable: T2
Type: float
Total Size: 5844 bytes
            1461 values
Number of Dimensions: 1
Dimensions and sizes: [time | 1461]
Coordinates:
            time: [1884648..1919688]
Number Of Attributes: 5
  long_name : MJO PC INDEX
  info : (PC1^2 + PC2^2)
  ts_mean : ( 4.944145e-09, -3.424131e-09 )
  matrix : covariance
  _FillValue : 32766

ncl 13> printVarSummary(T3)   *;time  *
Variable: T3
Type: double
Total Size: 11688 bytes
            1461 values
Number of Dimensions: 1
Dimensions and sizes: [time | 1461]
Coordinates:
            time: [1884648..1919688]
Number Of Attributes: 6
  units : hours since 1800-01-01 00:00:0.0
  long_name : Time
  actual_range : ( 1528872, 1919688 )
  delta_t : 0000-00-01 00:00:00
  standard_name : time
  axis : T

Thanks for anybody could help and giving solution for this error
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