In order to run HomCont one must prepare an equations file xxx.f, where xxx is the name of the example, and two constants-files c.xxx and h.xxx. The first two of these files are in the standard AUTO format, whereas the h.xxx file contains constants that are specific to homoclinic continuation. The choice IPS=9 in c.xxx specifies the problem as being homoclinic continuation, in which case h.xxx is required.
The equation-file kpr.f serves as a sample for new equation files. It contains the Fortran routines FUNC, STPNT, PVLS, BCND, ICND and FOPT. The final three are dummy routines which are never needed for homoclinic continuation. Note a minor difference in STPNT and PVLS with other AUTO equation-files, in that the common block /BLHOM/ is required.
The constants-file c.xxx is identical in format to other AUTO constants-files. Note that the values of the constants NBC and NINT are irrelevant, as these are set automatically by the choice IPS=9. Also, the choice JAC=1 is strongly recommended, because the Jacobian is used extensively for calculating the linearization at the equilibria and hence for evaluating boundary conditions and certain test functions. However, note that JAC=1 does not necessarily mean that auto will use the analytically specified Jacobian for continuation.