547 reputation
313
bio website cs.wisc.edu/~tdw
location University of Wisconsin-Madison
age 28
visits member for 2 years, 9 months
seen Dec 10 at 18:31

Ph.D. student in theoretical computer science interested in the complexity of counting problems.


Dec
4
accepted Get rational and irrational parts
Dec
4
comment Get rational and irrational parts
Yes, of course. Very clever solution.
Dec
4
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.
Dec
4
comment Get rational and irrational parts
What if $a$ and $b$ are symbolic?
Dec
4
comment Get rational and irrational parts
Very nice. Thanks!
Dec
4
asked Get rational and irrational parts
Nov
1
accepted Simple pattern/texture on chart elements
Nov
1
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.
Nov
1
revised Simple pattern/texture on chart elements
clarified
Nov
1
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?
Nov
1
asked Simple pattern/texture on chart elements
Oct
31
accepted Grid lines extending too far
Oct
31
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.
Oct
31
asked Grid lines extending too far
Aug
6
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.
Aug
6
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.
Aug
3
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?
Aug
2
awarded  Curious
Aug
1
asked Use of Strassen's algorithm
Apr
6
awarded  Popular Question