April 1969 - Vol. 12 No. 4
Features
Editorial: on the ACM publications
It is proper that a professional organization periodically review its publication policy to ensure that it is fully meeting its responsibilities to its members To this…
Analysis of boolean program models for time-shared, paged environments
Directed graphs or their associated matrices are frequently used to represent the logical structure of sequences of computer instructions. Such techniques are used and,…
An algorithm for hidden line elimination
The algorithm presented causes the elimination of hidden lines in the representation of a perspective view of concave and convex plane-faced objects on the picture plane.…
Simulation of outpatient appointment systems
An experimental computer program is described which simulates appointment systems employed by outpatient departments of hospitals. Both major kinds of appointment…
On coordination reduction and sentence analysis
A class of coordination phenomena in natural languages is considered within the framework of transformational theory. To account for these phenomena it is proposed that…
An algorithm for solving a special class of tridiagonal systems of linear equations
An algorithm is presented for solving a system of linear equations Bu = k where B is tridiagonal and of a special form. This form arises when discretizing the equation -…
Computation of Jn(x) by numerical integration
It is shown to be practical to compute Jn(x) by numerical integration of its integral representation using the trapezoidal rule. The error in this approximation was…