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- Date: Sun, 23 Sep 90 09:33:50 PDT
- From: mathworks!moler@apple.com (Cleve Moler)
- To: w8sdz@WSMR-SIMTEL20.ARMY.MIL (Keith Petersen)
- Subject: MATLAB
-
- Is There a "Public Domain" MATLAB?
-
- From time to time, I see references to, or get requests for, the
- "public domain" version of MATLAB. I am the original author of
- MATLAB, and one of the founders of The MathWorks. I would like
- to explain how I regard "public domain" MATLAB.
-
- There are two versions of MATLAB. I wrote the first, which we now
- refer to as "classic" MATLAB, over the period from 1977 to 1984,
- while I was on the faculty at the University of New Mexico. It is
- an interactive matrix laboratory, written in Fortran, which uses
- some of the subroutines from LINPACK and EISPACK. I distributed
- a few hundred copies of the source code, usually charging a
- small service charge, and including a letter requesting that the
- code not be redistributed. I never used the term "public domain".
-
- The second version, written in C by Steve Bangert and John Little,
- is the basis for a family of products from The MathWorks, Inc.,
- a company which Bangert, Little and I founded in 1985. These
- products are called PC-MATLAB, Mac-MATLAB, Pro-MATLAB, etc.
-
- I obviously recommend that anyone interested in using MATLAB
- acquire the MathWorks version appropriate for his or her machine.
- In addition to my commercial interest, I believe the MathWorks
- versions are preferable scientifically, educationally, and, in the
- long run, economically. The MathWorks versions:
-
- * Are faster in execution,
- * Have much better storage management,
- * Include powerful graphics,
- * Are extensible and programmable,
- * Can be expanded with sophisticated "toolboxes",
- * Are supported by scientific software professionals.
-
- The only feature of classic MATLAB that is not present in modern
- MATLAB is the "chop" function which allows the simulation of
- shorter precision arithmetic. It is an interesting curiosity,
- but it is no substitute for roundoff error analysis and it makes
- execution very slow, even when it isn't used.
-
- I know of several serious bugs in classic MATLAB, particularly
- in logical and looping operations, but I don't intend to fix them.
- In fact, there have been no fixes made to the code since about 1982.
- I stopped distributing any copies myself 4 or 5 years ago.
-
- The number of computers for which MathWorks MATLAB is not available
- is declining as old machines are retired and new machine versions
- are announced.
-
- A few other commercial systems, for example SCT's CTRL-C,
- are based on classic MATLAB. That's OK. CTRL-C, was done with
- my permission and it helped establish MATLAB in control and
- systems engineering. Now the company is a worthy competitor.
-
- I realize that classic MATLAB is available on a few bulletin boards
- and through some "freeware" services. In some cases, unauthorized
- statements about public domain software are included. I have
- regarded this as a mixed blessing. It certainly gives the MATLAB
- approach to computing valuable exposure, but I am afraid that some
- users of classic MATLAB do not realize how inferior it is to the
- MathWorks products.
-
- In summary, here is my position:
-
- * There is no such thing as "public domain" MATLAB.
-
- * I no longer distribute "classic" MATLAB.
-
- * The code and documentation of classic MATLAB cannot
- be used for commercial purposes without my permission.
-
- * I would appreciate it if anybody making a copy of
- classic MATLAB for personal or educational use
- would include this statement with it.
-
- Thanks to everybody who has used and supported all the versions
- of MATLAB over the years. Stick with us -- we're committed to
- its continued support, development and improvement.
-
- -- Cleve Moler
- moler@mathworks.com, or,
- na.moler@na-net.stanford.edu
-
- MathWorks main office:
- The MathWorks, Inc.
- 21 Eliot Street
- South Natick, MA 01760
- 508-653-1415
-
-