## page was renamed from lyapunov
=== Program lyapunov ===

This program calculates the lyapunov exponent and adds it to the clams file.

Arround every point in the clams file (init file) a circle with a specified radius and a specified number of points is created. For all these points trajectories (max. 24 hours) are calculated by calling ''traj''. 
Then the lyapunov exponent for all points in the clams file is calculated and added to this file.

==== Configuration file ====

The options for the execution of ''lyapunov'' can be set in the configuration file '''lyapunov.inp''':
{{{
1)  12 09 08 2003                                ! date
2)  /private/icg112/clim/BN0_ECZ_3d_24_1.5       ! directory with init files
3)  BN0                                          ! prefix of init files
4)  /usr/nfs/clams/icg125/cawses/isen_zeta/links ! directory with wind files
5)  ECZ                                          ! prefix of wind files
6)  /private/icg112/lyap                         ! output directory
7)  24                                           ! time step (in hours)
8)  y                                            ! y/n -> backward/forward run 
9)  y                                            ! y/n -> 3d/2d run 
10) 100.                                         ! circle radius in km
11) 6                                            ! number of APs/circle
12) icg112                                       ! userid
13) N.Thomas                                     ! user name
14) /home/icg1/icg112/clams/traj/traj            ! traj executable
}}}

Remarks:

 1. Date of init file
 1. Directory with init file
 1. Prefix of init file consisting of three characters
 The init file name corresponds to the format ''init_xxx_yymmddhh.nc'' with the prefix ''xxx'' in line 3 and the date specified in line 1.
 1. Directory with wind files used by program ''traj''
 1. Prefix of wind files
 The filenames must correspond to the format ''isen_xxx_yymmddhh.nc''. The prefix ''xxx'' must be specified in this line.
 1. Output directory for temporal files (pos file used by ''traj'' and trajectory file created by ''traj'')
 1. Length of trajectories in hours (max. 24)
 1. Specification, if forward or backward trajectories should be calculated: <<BR>>
 y = backward trajectories <<BR>> n = forward trajectories
 1. 2d or 3d trajectory run: <<BR>>
 y = 3d run (with theta_dot) <<BR>> n = 2d run (without theta_dot)
 1. Circle radius in km
 1. Number of air parcels per circle <<BR>>
 Arround every point in the clams file a circle with the specified radius and the specified number of points is created.
 1. Userid
 1. User name
 1. Traj executable