This .zip archive contains instances for the project on symbolic regression of Bio-Inspired Algorithms.

The filename of each instance follows a structure that indicates some information about them, e.g. sr_poly_4.txt:

- All instances start with "sr_" and end in ".txt".
- After this first part, instances include one of the following keywords:
  + poly: instances which follow a polynomial function with integer coefficients;
  + ratio: instances which follow a ratio of two polynomials;
  + approx: functions which follow different forms that cannot be captured by solutions and must be approximated;
  + periodic: periodic functions.
- The last part of the filename is a number, which indicates an identifying number within each category.


Each instance follows the following format: in the first line, a single integer n specifies the number of data points to follow; the following n lines contain two real numbers separated by a space, corresponding to x and y respectively.
