Re: Can Mathematica invert large complex arrays ( 700x700)?---in a timely way that is

*To*: mathgroup at yoda.physics.unc.edu*Subject*: Re: Can Mathematica invert large complex arrays ( 700x700)?---in a timely way that is*From*: mek at guinan.psu.edu (Mark E. Kotanchek)*Date*: Fri, 15 May 92 08:15:27 EDT

In response to Gregory Lampshire's query, How good is Mme 2.0 on complex arrays that are about 700x700? Would I expect to complete in a timely way on a NeXTstation with 32 Mb of main memory? By timely I mean within a half an hour? I can't answer this; however, make SURE you don't have any symbols in your matrix or mma will attempt to invert the matrix SYMBOLICALLY--in which case you'll be waiting a lot longer. Since "symbols" include things like Pi I've found that when using mma for numerical stuff, its best to check the arrays (lists) and N[variables] before the critical steps. This results in several orders of maginitude in performance increase. Mark. --- Mark Kotanchek Guidance & Control Dept - 363 ASB Applied Research Lab/Penn State P.O. Box 30 State College, PA 16804 e-mail: mek at guinan.psu.edu (NeXTmail) TEL: (814)863-0682 FAX: (814)863-7843