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In this paper, we describe a method for solving sets of nonlinear alge braic equations that arise in computer-aided circuit (CAD) programs in the steady-state mode of analysis. The method discriminates among differ ent circuit elements in their contribution to the circuit equations. A loga rithmic mapping is used on a subset of the correction vector involved in updating nonlinear current and voltage elements and their partial deriva tive contribution to the circuit equations. The values of nonlinear resis tors, conductors, inductors, and capacitors are updated at every iterative step and then treated as though they were linear elements. However, in the steady-state mode, the values of capacitors and inductors are trans formed into conductors and resistors, respectively. The values of these ele ments are made functions of the Newton iteration. The functional relation depends upon the convergence behavior of the solution vector.We will also derive the element stamps of different nonlinear elements and generalize the stamps of arbitrary nonlinear functions.

A family of methods has been developed for processing free-form text ftlcs usiig APL. We assume that a file has an arbitrary stmcturc and has regions of statistical and numerical data embedded in it. The data in the file are processed to extract the following information: 1. the embedded statistical and numeric regions, 2. titles, keys (legends), and tic-mark identiftcrs, associated with each region, and 3. dates and other pertinent information. Once these data are extracted, bar, line, pie charts or a combination of those arc plotted. An APL program which is automatically loaded and invoked performs these tasks. The program has been tested on hundreds of f&s with different structures. Some of these files have multiple statistical regions.