Output Files.

AUTO writes to standard output and three output-files :

-

standard output:  A summary of the computation is written to standard output, which usually corresponds to the window in which AUTO is run. Only special, labeled solution points are noted, namely those listed in Table 6.1. The letter codes in the Table are used in the screen output. The numerical codes are used internally and in the fort.7 and fort.8 output-files described below.

Table 6.1: Solution Types.

BP	(1)	Branch point (algebraic systems)
LP	(2)	Fold (algebraic systems)
HB	(3)	Hopf bifurcation
	(4)	User-specified regular output point
UZ	(-4)	Output at user-specified parameter value
LP	(5)	Fold (differential equations)
BP	(6)	Branch point (differential equations)
PD	(7)	Period doubling bifurcation
TR	(8)	Torus bifurcation
EP	(9)	End point of family; normal termination
MX	(-9)	Abnormal termination; no convergence

-

fort.7 :  The fort.7 output-file contains the bifurcation diagram. Its format is the same as the fort.6 (screen) output, but the fort.7 output is more extensive, as every solution point has an output line printed.

-

fort.8 :  The fort.8 output-file contains complete graphics and restart data for selected, labeled solutions. The information per solution is generally much more extensive than that in fort.7. The fort.8 output should normally be kept to a minimum.

-

fort.9 :  Diagnostic messages, convergence history, eigenvalues, and Floquet multipliers are written in fort.9. It is strongly recommended that this output be habitually inspected. The amount of diagnostic data can be controlled via the AUTO-constant IID; see Section 10.9.2.

The user has some control over the fort.6 (screen) and fort.7 output via the AUTO-constant IPLT (Section 10.9.3). Furthermore, the routine PVLS can be used to define ``solution measures'' which can then be printed by ``parameter overspecification''; see Section 10.7.10. For an example see demo pvl.

The AUTO-commands @sv(sv), @ap(ap), and @df(df) can be used to manipulate the output-files fort.7, fort.8, and fort.9. Furthermore, the AUTO-command @lb(rl) can be used to delete and relabel solutions simultaneously in fort.7 and fort.8. For details see Section 5.

The graphics programs PLAUT, PLAUT04, and the Python CLUI command plot can be used to graphically inspect the data in fort.7 and fort.8; see Chapters 7,  8, and 4.