User Defined Variables

User defined data files are ASCII text files that are created by the
user with a text editor (see the READ File Format section in Appendix B
in the manual).  These files can only be accessed by the READ function;
e.g.

          FILE = "jogtime";   Jogcal = 200 * READ/60;<*br>
          PLOT (Foodcal - Jogcal );

Here 'jogtime' would be a text file containing the date and the number
of minutes spent jogging during that day.  'Jogcal' then becomes a DAN
variable that contains the number of calories expended jogging on the
given dates and is usable in subsequent expressions.
