The Graphics Advisor is an expert system that helps users of the Los Alamos Integrated Computing Network select the graphics library that is best suited to the characteristics of a specific graphics application. The implementation of the system, using a commercial expert system development tool,...

This paper describes the background to, and current progress in, the development of knowledge-based front-ends for existing numerical and statistical software with which the Numerical Algorithms Group (NAG) is involved.

In an earlier paper concerned with the distribution associated with products, quotients, and powers of two dependent nonnegative random variables, a generalized distribution called the bivariate H-function distribution was presented. Here, further properties of this distribution are explored....

The primary goal of the Guide to Available Mathematical Software (GAMS) project is to provide convenient access to information about mathematical and statistical software which is available to computer users at the National Institute for Standards and Technology. The principal vehicle through...

The decomposition method is applied to a stiff system of differential equations to obtain a converging series which is summed for an analytic solution. Advantages over fourth- and fifth- order Runge-Kutta methods are shown.

A simple model for the human circadian rhythm of deep body temperature is described. The model accounts for both the endogenous circadian rhythm, and the principal masking effects resulting from sleep, activity, and ambient temperature. The Continuous System Modelling Program (CSMP) language was...

A spreadhseet model, SIMPROBE, evaluated alternative feeding sequences for fattening beef steers based on six different forages. This static model is a simplification of a FORTRAN model called PROBE. SIMPROBE calculates forage utilization, liveweight, fatscore, relative sale price and annual...

In this paper a new formulation of the problem of identification of discrete-time linear models in the case of Unknown-But-Bounded errors is proposed. The bounds of the error at each sampling time are specified over a measurement noise rather than over an equation error, which is mainly...

An adaptation of the decomposition method (Adomian, 1986) allows asymptotic solutions for differential and partial differential equations.

The Vignes-La Porte CESTAC method enables the computer, when solving a problem in floating-point arithmetics (e.g., a system of equations), to construct 95% confidence intervals for the accuracy of the solution. In iterative methods, this involves the Optimal Stopping Criterion, which may be too...