# Advice

Some final advice

- Use a mixed error test unless you specifically want to fix the correct number of decimal-places or significant-digits.
- Set TOL between 1.0E-3 and 1.0E-6 unless you really want highly accurate (1.0E-7) or just very approximate (1.0E-2) integration.
- If you have a set of n equations but are only interested in m components ( m =< n ) for plotting, displaying or filing, you should select a sub-set of indices of interest.
- To fit data, use makdat to prepare files with x,y,s values for the y(i).
  Note that files can have different x-values and can be referenced by a library file (see deqsol.tfl).
- Before fitting, you should simulate the solution to compare data points and simulation, until a reasonable fit has been obtained.
  Then just use the fitting to refine the parameter and initial condition estimates.
- Note that an ASCII text file must define the differential equations as illustrated in the deqmod?.tf? test files.
  The Jacobian can also be defined in this file if required.
- The last n parameters when curve fitting MUST be the n initial y0(i) values, but they can be estimated or fixed.

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