Tyson Williams
Reputation
552
Top tag
Next privilege 1,000 Rep.
See vote count; VIP usercard
 Apr1 awarded Popular Question Dec4 accepted Get rational and irrational parts Dec4 comment Get rational and irrational parts Yes, of course. Very clever solution. Dec4 comment Get rational and irrational parts As a mathematician / theoretical computer scientist, I think of $a$ and $b$ as "symbolically rational" (i.e. some rational numbers by assumption). Of course I also know, but often forget, that (1) symbolic, (2) symbolically rational, and (3) and rational are three different "data types" that can all behave differently in Mathematica. Dec4 comment Get rational and irrational parts What if $a$ and $b$ are symbolic? Dec4 comment Get rational and irrational parts Very nice. Thanks! Dec4 asked Get rational and irrational parts Nov1 accepted Simple pattern/texture on chart elements Nov1 comment Simple pattern/texture on chart elements Scaling is definitely needed since this BarChart is just a MWE. My actual BarChart does only have two types of bars though. Nov1 revised Simple pattern/texture on chart elements clarified Nov1 comment Simple pattern/texture on chart elements That would work, but I would prefer it there were some sort of pattern as well. Can you make one have stripes or dots? Nov1 asked Simple pattern/texture on chart elements Oct31 accepted Grid lines extending too far Oct31 comment Grid lines extending too far Yes, both solutions work for the example I gave, but this one continues to work after adding the option PlotRange -> {0, 4}) but the other solution no longer works. Oct31 asked Grid lines extending too far Aug6 comment Use of Strassen's algorithm I am looking for a definitive answer...not "I believe" or "typically used for $N \ge 100$". Someone familiar with the BLAS source code should be able to tell us a specific scenario, which preferably is based solely on a threshold of the matrices' dimensions, when DGEMMS* is called. Aug6 comment Use of Strassen's algorithm @Charles That is good to know, but my original question remains. For what dimension matrices does BLAS use DGEMMS*? On page 108 of Numerical Recipes: The Art of Scientific Computing (3rd ed.), which was published in 2007, it says that BLAS uses Strassen's algorithm when the size of the matries is about 100. Daniel's answer (which he qualifies with "I believe") is in contradiction with this quote. Aug3 comment Use of Strassen's algorithm Paraphrase quote: "For numerical linear algebra, Mathematica uses BLAS and I don't think BLAS uses Strassen's algorithm." Who/where should I ask to confirm this? Aug2 awarded Curious Aug1 asked Use of Strassen's algorithm