AN IMPROVED ALGORITHM FOR EVALUATION OF THE PRODUCT OF AN EXPONENTIALFUNCTION WITH AN ERROR FUNCTION COMPLEMENT

Some mathematical CAD packages are inadequate in computing the composi te functions involving the product of an exponential function and an e rror function complement. These functions arise in physical applicatio ns, such as problems in diffusion, Their importance warrants a composi te treatment. If their component factors are computed individually, di scontinuities in the evaluations arises, as shown in some CAD packages , An improved algorithm is presented which overcomes this deficiency, and provides a fast evaluation. Such evaluation is successful even usi ng floating point numbers with single precision. The potential for num erical overflow associated with large arguments has been overcome.