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ACM Transactions on Mathematical Software (TOMS), Volume 25 Issue 1, March 1999

A combined unifrontal/multifrontal method for unsymmetric sparse matrices
Timothy A. Davis, Iain S. Duff
Pages: 1-20
DOI: 10.1145/305658.287640
We discuss the organization of frontal matrices in multifrontal methods for the solution of large sparse sets of unsymmetric linear equations. In the multifrontal method, work on a frontal matrix can be suspended, the frontal matrix can be...

A test package for Sturm-Liouville solvers
J. D. Pryce
Pages: 21-57
DOI: 10.1145/305658.287651
The author and colleagues have produced a collection of 60 test problems which offer a realistic performance test of the currently available automatic codes for eigenvalues of the classical Sturm-Liouville problem. We describe a Fortran...

Algorithm 789: SLTSTPAK: a test package for Sturm-Liouville solvers
J. D. Pryce
Pages: 58-69
DOI: 10.1145/305658.287652
We give technical details of the Sturm-Liouville test package SLTSTPAK, complementing the companion article (this issue) on its design. SLTSTPAK comprises the follwing : a specification of how to write a routine TSTSET containing a set of...

Algorithm 790: CSHEP2D: cubic Shepard method for bivariate interpolation of scattered data
Robert J. Renka
Pages: 70-73
DOI: 10.1145/305658.305737
We describe a new algorithm for scattered data interpolation. The method is similar to that of Algorithm 660 but achieves cubic precision and C2 continuity at very little additional cost. An accompanying...

Algorithm 791: TSHEP2D: cosine series Shepard method for bivariate interpolation of scattered data
Robert J. Renka, Ron Brown
Pages: 74-77
DOI: 10.1145/305658.305754
We describe a new algorithm for scattered data interpolation. It is based on a modified Shepard method similar to that of Algorithm 660 but uses 10-parameter cosine series nodal functions in place of quadratic polynomials. Also, the interpolant...

Algorithm 792: accuracy test of ACM algorithms for interpolation of scattered data in the plane
Robert J. Renka, Ron Brown
Pages: 78-94
DOI: 10.1145/305658.305745
We present results of accuracy tests on scattered-data fitting methods that have been published as ACM algorithms. The algorithms include seven triangulation-based methods and three modified Shepard methods, two of which are new algorithms. Our...

Remark on Algorithm 716
F. J. Testa, Robert J. Renka
Pages: 95-96
DOI: 10.1145/305658.287656
The curve-fitting package TSPACK has been converted to double precision. Also, portability has been improved by eliminating some potential errors.

Remark on Algorithm 751
Robert J. Renka
Pages: 97-98
DOI: 10.1145/305658.305726
The triangulation package TRIPACK has been revised to run more efficiently and to eliminate some potential errors. Also, a portable triangulation plotting routine was added.

Remark on Algorithm 752
Robert J. Renka
Pages: 99-100
DOI: 10.1145/305658.305731
The triangulation-based scatterd-data fitting package SRFPACK was updated for (a) compatibility with a revised interface to the triangulation package TRIPACK, (b) the elimination of potential errors in the treatment of tension factors and in the...

A note on the recursive calculation of incomplete gamma functions
Walter Gautschi
Pages: 101-107
DOI: 10.1145/305658.305717
It is known that the recurrence relation for incomplete gamma functions {&ggr;(a + n, x)}, 0 ≤ a < 1, n = 0, 1, 2 ..., when x is...

Remark on Algorithm 702—the updated truncated Newton minimization package
Dexuan Xie, Tamar Schlick
Pages: 108-122
DOI: 10.1145/305658.305698
A truncated Newton minimization package, TNPACK, was described in ACM Transactions on Mathematical Software 14, 1 (Mar. 1992), pp.46–111. Modifications to enhance performance, especially for large-scale minimization of...

Self-adapting Fortran 77 machine constants: comment on Algorithm 528
David M. Gay, Eric Grosse
Pages: 123-126
DOI: 10.1145/305658.305711
This note discusses user dissatisfaction with the need to uncomment data statements in Algorithm 528, comments on alternative approaches tried by the community, and proposes a solution that is both automatic and safe.