* Using OpenGrADS [#fdf9f2c5]

- For me, only for calculation of stream function and velocity potential...
- Official site: http://opengrads.org

#contents

** Installation [#u9907509]
All examples are for grads-1.9 on Linux-PC, located at ~/GrADS.
+ Save the original grads directory at somewhere else (just in case).
+ Get appropriate executables from http://sourceforge.net/projects/opengrads/files/grads1/grads-1.9.0-rc1-bin-i686-pc-linux-gnu.tar.gz/download, and copy the contents in bin directory to ~/GrADS/bin (overwrite them).
+ Get appropriate extensions from http://sourceforge.net/projects/opengrads/files/extensions/grads-1.9.0-rc1-gex-r2-i686-pc-linux-gnu.tar.gz/download, and copy the contents in bin directory to ~/GrADS/bin (there should be no file with same name).
+ Set environmental variables as follows:~
GAUDXT=$HOME/GrADS/bin/gex/udxt~
LD_LIBRARY_PATH=$HOME/GrADS/bin/gex:$LD_LIBRARY_PATH

** Drawing stream function [#ba64e112]
 $ gradsnc
 > open pgb.ctl (example)
 > d fish_psi(ugrdprs,vgrdprs)