DS

AUTO uses pseudo-arclength continuation for following solution families. The pseudo-arclength stepsize is the distance between the current solution and the next solution on a family. By default, this distance includes all state variables (or state functions) and all free parameters. The constant DS defines the pseudo-arclength stepsize to be used for the first attempted step along any family. (Note that if IADS$>$0 then DS will automatically be adapted for subsequent steps and for failed steps.) DS may be chosen positive or negative; changing its sign reverses the direction of computation. The relation DSMIN $\le$ $\mid\tt DS\mid$ $\le$ DSMAX must be satisfied. The precise choice of DS is problem-dependent; the demos use a value that was found appropriate after some experimentation.