Date: Wed, 12 Feb 1997 04:55:56 -0400 To: Bill Simpson <wsimpson@uwinnipeg.ca> From: Paul Gilbert <la-jassine@aix.pacwan.net> Subject: R-alpha: complex arithematic There are at least two areas in which complex numbers are useful for my work. First, as in linear systems theory and system identification, I am often interested in the eigenvalues of non-symmetric matrices. To solve this does not require a full implementation of complex numbers. It is possible to just deal with the real and imaginary parts as two real numbers and write special code for Mod, etc. The second is looking at the roots of polynomials. Again, this could largely be solved by dealing with the real and imaginary parts as two real numbers, but there are certainly times when it is convenient to do addition, subtraction, multiplication and division of complex numbers. For my work a partial implementation would solve most of my problems. But the incompatiblity with S would make it a real problem to maintain my code, so I would much prefer the full implementation. Paul Gilbert =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- r-testers mailing list -- For info or help, send "info" or "help", To [un]subscribe, send "[un]subscribe" (in the "body", not the subject !) To: r-testers-request@stat.math.ethz.ch =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-