LAPACK(7)

NAME
LAPACK - library of linear algebra routines

什么是 LAPACK ?
LAPACK 是一个 Fortran 77 子程序的 transportable library ， 用来解决多数数字线性代数中共同的问题： systems of linear equations, linear least squares problems, eigenvalue problems, 还有 singular value problems. 它在大部分现代的高性能计算机中可以高效地运作。 LAPACK 是 LINPACK 和 EISPACK 的后继者。 它扩展了这些库的功能，包含了线性系统的 equilibration, iterative refinement, error bounds, 和 driver routines， routines for computing and re-ordering the Schur factorization， 还有 condition estimation routines for eigenvalue problems. LAPACK 通过包含 finding singular values and eigenvalues of bidiagonal and tridiagonal matrices respectively that arise in SVD and symmetric eigenvalue problems 的高精度算法提高了 EISPACK 中标准算法的精度。 这些算法和软件被重新编写，在向量处理器上，高性能 ``superscalar'' 工作站上和 共享内存的多处理器上都可以获得高效率。 LAPACK 软件还附带了一个复杂的测试和时间测算套件。

如何得到 LAPACK
完整的 LAPACK 软件包可以从 xnetlib 和 NAG 得到，也可以从 netlib 获得特定的库。 要查看 LAPACK 内容的描述，向 netlib@ornl.gov 发一封消息类型为： send index from lapack 的电子邮件。 Xnetlib is an X-version of netlib recently developed at the University of Tennessee and Oak Ridge National Laboratory. Unlike netlib, which uses electronic mail to process requests for software and other text, xnetlib uses an X Window graphical user interface and a socket-based connection between the user's machine and the xnetlib server machine to process software requests. The complete contents of LAPACK is available in tar/compress format from xnetlib. To receive a copy of xnetlib send the message "send xnetlib.shar from xnetlib" to netlib@ornl.gov. When you receive the shar file, remove the mail header, save it to a file, type 'sh filename' and follow the instructions in the README file. Alternatively, the complete LAPACK package can be obtained from NAG on magnetic media for a handling charge. For further details contact NAG at one of the following addresses:

NAG Inc	                      NAG Ltd              NAG GmbH
1400 Opus Place               Wilkinson House      Schleissheimerstrasse 5
Suite 200                     Jordan Hill Road     W-8046 Garching bei Munchen
Downers Grove, IL 60515-5702  Oxford OX2 8DR       Germany
USA                           England
Tel: +1 708 971 2337          Tel: +44 865 511245  Tel: +49 89 3207395
Fax: +1 708 971 2706          Fax: +44 865 310139  Fax: +49 89 3207396

LAPACK has been thoroughly tested, on many different types of computers. The LAPACK project supports the package in the sense that reports of errors or poor performance will gain immediate attention from the developers. Such reports, descriptions of interesting applications, and other comments should be sent by electronic mail to lapack@cs.utk.edu.

LAPACK USERS' GUIDE
The LAPACK Users' Guide is published by SIAM and was made available May, 1992. LAPACK Users' Guide gives an informal introduction to the design of the algorithms and software, summarizes the contents of the package, and describes the conventions used in the software and documentation, and includes complete specifications for calling the routines. The LAPACK Users' Guide can be purchased from: SIAM; 3600 University City Science Center; Philadelphia, PA 19104-2688; 215-382-9800, FAX 215-386-7999. It will also be available from booksellers. The Guide costs $15.60 for SIAM members, and $19.50 for non-members. Please specify order code OT31 when ordering. To order by email, send email to service@siam.org. A list of known problems, bugs, and compiler errors for LAPACK, as well as errata for the LAPACK Users' Guide and the LAPACK code itself, is maintained on netlib. For a copy of this report, send email to netlib@ornl.gov with a message of the form: send release_notes from lapack.

LAPACK WORKING NOTES
A number of working notes were written during the development of LAPACK and published as LAPACK Working Notes, initially by Argonne National Laboratory and later by the University of Tennessee. Many of these reports have subsequently appeared as journal articles. Most of these working notes are available in postscript form from netlib. To receive a list of available reports, send email to netlib@ornl.gov with a message of the form: send index from lapack/lawns. Otherwise, requests for copies of these working notes can be sent to the following address. LAPACK Project c/o J.J. Dongarra Computer Science Department University of Tennessee Knoxville, Tennessee 37996-1301 USA Email: lapack@cs.utk.edu

ACKNOWLEDGEMENTS
LAPACK has been funded in part by NSF, DOE, and DARPA, with developmental support from NAG Ltd., Cray Research, and many friends and colleagues around the world.

Ed Anderson, Zhao-jun Bai, Chris Bischof, Jim Demmel, Jack Dongarra, Jeremy Du Croz, Anne Greenbaum, Sven Hammarling, Alan McKenney, Susan Ostrouchov, and Danny Sorensen

             ( l l l l )
             ( a -a a -a )
       1/4 * ( p p -p -p )
             ( a -a -a a )
             ( c c -c -c )
             ( k -k -k k )

NAMING SCHEME
The name of each LAPACK routine is a coded specification of its function (within the very tight limits of standard Fortran 77 6-character names).

All driver and computational routines have names of the form XYYZZZ, where for some driver routines the 6th character is blank.

The first letter, X, indicates the data type as follows:

      S REAL
      D DOUBLE PRECISION
      C COMPLEX
      Z COMPLEX*16 or DOUBLE COMPLEX

The next two letters, YY, indicate the type of matrix (or of the most significant matrix). Most of these two-letter codes apply to both real and complex matrices; a few apply specifically to one or the other.

The last three letters ZZZ indicate the computation performed. For example, SGEBRD is a single precision routine that performs a bidiagonal reduction (BRD) of a real general matrix.

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