Table of Contents
1 Introduction ................................................................................................................................................................................................................................................ 4
2 Basics of the Languages NCL and Python ..................................................................................................................................................................................................... 5
3 Arithmetic Functions ................................................................................................................................................................................................................................... 9
4 Read a File ................................................................................................................................................................................................................................................. 10
4.1 Read GRIB, HDF or netCDF Data Sets .................................................................................................................................................................................................. 10
4.2 Read an ASCII File ............................................................................................................................................................................................................................... 10
4.3 Read Multiple Files ............................................................................................................................................................................................................................. 12
5 Write a File ................................................................................................................................................................................................................................................ 14
5.1 Write a netCDF File ............................................................................................................................................................................................................................. 14
5.2 Write an ASCII File .............................................................................................................................................................................................................................. 18
6 Plotting ..................................................................................................................................................................................................................................................... 20
6.1 Maps ................................................................................................................................................................................................................................................. 20
6.2 XY-Plot ............................................................................................................................................................................................................................................... 23
6.2.1 Bar Charts and Histograms .......................................................................................................................................................................................................... 25
6.3 Contour Plots ..................................................................................................................................................................................................................................... 28
6.3.1 Contour Line Plot ........................................................................................................................................................................................................................ 28
6.3.2 Contour Fill Plot .......................................................................................................................................................................................................................... 29
6.3.3 Contour Lines on Maps ............................................................................................................................................................................................................... 30
6.3.4 Contour Fill on Maps................................................................................................................................................................................................................... 32
6.4 Vector and Streamline Plots ................................................................................................................................................................................................................ 34
6.4.1 Vector Plot on Maps ................................................................................................................................................................................................................... 34
6.4.2 Streamline Plot on Maps ............................................................................................................................................................................................................. 35
6.5 Slices .................................................................................................................................................................................................................................................. 38
6.6 Scatter Plots ....................................................................................................................................................................................................................................... 40
6.7 Overlays ............................................................................................................................................................................................................................................. 42
6.8 Panel Plots ......................................................................................................................................................................................................................................... 45
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