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Array Subscripting • Three kinds of array subscripting 1. Index (uses ‘:’ and ‘::’) 2. Coordinate (uses curly braces ‘{‘ and ‘}’) 3. Named dimensions (uses ‘!’) • Most WRF-ARW data does not have coordinate arrays, so can’t use #2 • You can mix subscripting types in one variable • Be aware of dimension reduction • Index subscripting is 0-based (Fortran by default is 1-based) http://www.ncl.ucar.edu/Document/Manuals/Ref_Manual/NclVariables.shtml#Subscripts
Array index subscripting, : and :: ; Consider T(ntime x nlat x nlon) t = T ; copies metadata, don’t use T(:,:,:) t = (/T/) ; doesn’t copy metadata ; (_FillValue is retained) ; The following creates 2D array “t” t = T(0,:,::5) ; 1 st time index, all lat, every 5 th lon ; (nlat x nlon/5) t = T(0,::-1,:50) ; 1 st time index, reverse lat, ; first 51 lons (nlat x 51) t = T(:1,45,10:20) ; 1 st two time indices, 46 th index of lat, ; 11 th -21 st indices of lon (2 x 11) ; To prevent dimension reduction t = T(0:0,:,::5) ; 1 x nlat x nlon/5 t = T(:1,45:45,10:20) ; 2 x 1 x 21 NCL & WRF-NCL � WRF User’s User s Event � June 22-25, 2010
Page 1 and 2: Post-processing WRF-ARW Data with t
Page 3 and 4: • Overview • NCL basics • Fil
Page 5 and 6: WRF-NCL A suite of analysis and vis
Page 7 and 8: NCL: File input and output • Data
Page 9: NCL: Visualization • High-quality
Page 22 and 23: A T-S diagram is a graph showing th
Page 24 and 25: Based on a visualization of Adam Ph
Page 26 and 27: John Fasullo, NCAR/CGD
Page 29 and 30: CCMVal Workshop 2009 � June 1-5,
Page 33 and 34: load “$NCARG_ROOT/lib/ncarg/nclsc
Page 35 and 36: Mixing types ; Mixing types, “lar
Page 37 and 38: Arrays • Row major. . . like C/C+
Page 39 and 40: Special functions for arrays ; Very
Page 41 and 42: Missing values (_FillValue attribut
Page 43 and 44: File and variable attributes ; Use
Page 45: Array reorder, reshape, reverse ; R
Page 51 and 52: KHDIF : 0 KVDIF : 0 MP_PHYSICS : 3
Page 53 and 54: float V ( Time, bottom_top, south_n
Page 55 and 56: Back to NCL scripts: Two ways to re
Page 57 and 58: Reading (and examining) a variable
Page 59 and 60: Creating a new variable & adding at
Page 62 and 63: WRF-NCL built-in functions Can use
Page 64 and 65: Other WRF-NCL “WRFUserARW.ncl”
Page 66 and 67: Other WRF-NCL “WRFUserARW.ncl”
Page 68 and 69: Modifying wrf_user_getvar function
Page 70 and 71: Step-by-step WRF-ARW visualizations
Page 72 and 73: NCL & WRF-NCL � WRF User’s User
Page 75 and 76: wrf_contour/wrf_vector Create line/
Page 77 and 78: wrf_map_overlays/wrf_overlays Overl
Page 79 and 80: http://www.mmm.ucar.edu/wrf/OnLineT
Page 83 and 84: Example F77 code: myTK.f C NCLFORTS
Page 85 and 86: Calling Fortran 90 codes from NCL
Page 87 and 88: Example F90 code: myTK.f90 + stub m
Page 91 and 92: Debugging tips • Start with an ex
Page 95 and 96: Customizing your NCL graphics envir
Page 97 and 98:
With and without a “.hluresfile
Page 99 and 100:
Useful URLS • Online WRF-NCL Grap
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