The files in this folder contain text examples and definitions of the library interface routines.
In all of these files the computer prompt is just two spaces; there is no ? prompts as there are in the sample files and NCII default "New" file.
To modify an interface routine, type in the changes, position the cursor on the last line with the single "." (or select the entire program), and hit enter.
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To find out more about numerical programming, try
Numerical Recipes by W. Press et al,
which I highly recommend.
Also, if you have access to the internet, you can get FORTRAN source code for numerical work from
netlib@att.research.com
by sending an e-mail message there with the subject heading
help
, after which the netlib system will e-mail you back information about how to obtain the available routines. (There are hundreds.)
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If you want to write your own xCOD routines, see the folder Writing External Codes. That folder also has a few other xCODs (with source code) for some physics problems, which are used in the Sample Files: Physics folder.