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A study conducted on the properties of the partial correlation coefficients of the adaptive lattice filter based on recursive least squares algorithms showed that the forward and backward partial coefficients (PARCOR) are complex conjugates. The PARCOR coefficients for a general lattice filter were derived and expressions for the expected values of the PARCOR coefficients in the nonoptimal cases is found. It was observed that for a given chirp rate there is a threshold adaptation constant below which the total tracking error is negligible.

Symbolic software can be used to advantage teaching physical chemistry. Curve-fitting and the statistical analysis of fitting parameters is discussed as is analysis of the rotation/vibration spectrum of HCl, a diatomic molecule. A variety of Mathcad documents can be used for teaching chemistry. Addresses are given and three Mathcad worksheets are reviewed. Using them is not trivial for students and they need support.