Non-monotonic coordinate value being used, can't compete coordinate subscript

Hi NCL Talk,

I get the following error when I run the attached script. Looking at some previous online posts I think it is something to do with how it is picking up my lat/lon range but I am not sure how to resolve it.

fatal:NclOneDValGetClosestIndex: Non-monotonic coordinate value being used, can't complete coordinate subscript

fatal:Could not obtain coordinate indexes, unable to perform subscript

fatal:["Execute.c":7556]:Execute: Error occurred at or near line 213 in file ECMWF_DEMETER/demeter_v1_models_check_wrap.ncl

The line is is referring to is

spell_tot_uk(nr,:,:) = dim_sum_n(cold_uk1({spell(nr)},:,:,:),0)

which is part of a do loop

do nr=0,nspell-1

spell_tot_uk(nr,:,:) = dim_sum_n(cold_uk1({spell(nr)},:,:,:),0)

end do

I replaced the line ukmo = short2flt(a[:]->ukmo)

with the line below (just looking at some of the previous posts on similar error messages)

ukmo= short2flt(a[:]->ukmo(:,:,{32.5:75},{-27.5:45})) but I get the same error

The variables I extracted from the files (concat) were ukmo used to get tc2, the number of cold spells when tc2 falls below a critical value is extracted to using dim_numrum_n and then the number of each of the cold runs totalled up using the dim_sum_n loop above. The main variables are given below and a copy of the full script and all the variables attached. The length of the spell or run (1,2.....59,60) is manually entered in the script.

Any help would be much appreciated.

kind regards

Dominique

Variable: ukmo

Type: float

Total Size: 6998400 bytes

1749600 values

Number of Dimensions: 4

Dimensions and sizes: [step | 360] x [number | 9] x [latitude | 18] x [longitude | 30]

Coordinates:

step: [24..4320]

number: [0..8]

latitude: [32.5..75]

longitude: [-27.5..45]

Number Of Attributes: 6

_FillValue_original : -32767

_FillValue : -32767

missing_value_original : -32767

units : K

long_name : Minimum 2 metre temperature

missing_value : -32767

Variable: t2_uk

Type: float

Total Size: 6998400 bytes

1749600 values

Number of Dimensions: 4

Dimensions and sizes: [step | 360] x [number | 9] x [latitude | 18] x [longitude | 30]

Coordinates:

step: [24..4320]

number: [0..8]

latitude: [32.5..75]

longitude: [-27.5..45]

Number Of Attributes: 6

missing_value : -32767

long_name : Minimum 2 metre temperature

units : degC

missing_value_original : -32767

_FillValue : -32767

_FillValue_original : -32767

Variable: cold_uk1

Type: integer

Total Size: 6998400 bytes

1749600 values

Number of Dimensions: 4

Dimensions and sizes: [run_length | 360] x [number | 9] x [latitude | 18] x [longitude | 30]

Coordinates:

run_length: [24..4320]

number: [0..8]

latitude: [32.5..75]

longitude: [-27.5..45]

Number Of Attributes: 2

cold_crit_values : 0

long_name : unique cold runs

Variable: spell_tot_uk

Type: float

Total Size: 129600 bytes

32400 values

Number of Dimensions: 3

Dimensions and sizes: [60] x [latitude | 18] x [longitude | 30]

Coordinates:

latitude: [32.5..75]

longitude: [-27.5..45]

Number Of Attributes: 1

_FillValue : 9.96921e+36

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