Also see the TOOL Quick Reference Card.
The articles in this section discuss how to interact with data files external to the model.
In general the data files should not be touched! Try hard to take the data file from it's source and manipulate it in the model or in a view to fit the objects you need to file.
If, however, you want to prepare an empty file to then get others to fill in:
Root finding methods. See http://en.wikipedia.org/wiki/Root-finding_algorithm