The Jacobian Panel

Jacobian Panel

The Pisces Jacobian Panel.

The Jacobian panel allows the user to set parameters used by Pisces for taking numerical derivatives and for finding roots.

The top of the Jacobian panel contains fields that determine how Pisces computes finite-difference derivatives.

The remainder of the panel determines stopping criteria for Newton's methods of finding roots.

If the norm of the model evaluated at a point x is less than the value of this field, then x is determined to be a zero of the model.
During Newton's method, if the size of the Newton step distance is less than the value of this field, then we stop Newton's method because we are either not converging to a root or are converging very slowly.
The value of this field determines the number of Newton steps we are allowed to take before deciding that an initial guess will never converge to a root.
Important: after making a change to the Jacobian panel, you must press the "Update" button, or your change will not be implemented!
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Last modified: Sun Nov 26 18:51:10 1995
Copyright © 1995 by The Geometry Center, all rights reserved.