ROOTLOCS

RootLocs is a FREE application for Mac and PC that plots root locus diagrams of systems that can be represented by single-input-single-output (SISO) feedback loops. It can handle continuous and discrete-time systems with up to 20 poles & 20 zeros, including systems with negative gain (positive feedback) and those with time delay in the loop.

Features

• data entry as either polynomials or poles & zeros

• easy addition, deletion and repositioning of poles & zeros graphically

• tools for finding the gain at any locus point - and all points corresponding to a given gain

• magnification of any part of the locus plot

• time and frequency response charts with up to four traces each

• comprehensive built-in help