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location Seattle, WA
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visits member for 2 years, 1 month
seen Aug 6 at 21:20

I am a medical researcher and quantum systems engineer, whose experimental research interests focus upon quantum spin imaging and metrology, and whose theoretical interests focus upon large-scale quantum simulation, in overall service of advances in regenerative medicine.

For a non-technical overview of this research, see the (open-source) PNAS article "Spin Microscopy's Heritage, Achievements, and Prospects." For in-progress research see the Soldier Healing Seminar "Green Sheet Notes for 2013".

Quantum transport phenomena is a topic of particular interest, as efficiently simulated within frameworks in which large-dimension Hilbert-space gauge-field dynamics is emergent as the natural algebraic resolution of low-dimension varietal dynamics.


Aug
6
awarded  Nice Question
Aug
6
revised Sporadic bugs in multidimensional SparseArray objects
added 88 characters in body
Aug
6
revised Sporadic bugs in multidimensional SparseArray objects
Bug fixed in version 10.0
Jun
19
awarded  Nice Question
Mar
19
awarded  Self-Learner
Mar
19
awarded  Teacher
Mar
19
comment Sporadic bugs in multidimensional SparseArray objects
@Szabolcs ... self-answer posted per your suggestion.
Mar
19
accepted Sporadic bugs in multidimensional SparseArray objects
Mar
19
answered Sporadic bugs in multidimensional SparseArray objects
Mar
15
revised Sporadic bugs in multidimensional SparseArray objects
Wolfram response
Mar
10
comment Sporadic bugs in multidimensional SparseArray objects
Update: WRI is working on this bug: emails to "support at wolfram.com" with the subject "Re: [CASE:646986] Sporadic bugs (?) in multidimensional SparseArray objects" will be forwarded to the WRI development team. NOTE: there's no need to cc: me ... for my purposes the workaround of wrapping with "Normal" is acceptable.
Mar
10
awarded  Commentator
Mar
10
comment Sporadic bugs in multidimensional SparseArray objects
@Szabolcs I have followed your suggestion. When you say: "The only thing people can do here [on Mathematica StackExchange] is try to come up with workarounds", that is not quite true! The StackExchange is cross-indexed, searchable, archival, publicly responsive, and rapidly verifying ... and these valuable qualities are much-appreciated. Thanks are extended to all who commented!
Mar
9
awarded  Yearling
Mar
8
comment Sporadic bugs in multidimensional SparseArray objects
What is the best way to report bugs to WRI? (over the years, my experiences in this regard have been uneven).
Mar
8
comment Sporadic bugs in multidimensional SparseArray objects
That's what we see too ... furthermore, for some dimensionalities SparseArray seem to work OK ... that's why it's been pretty tough to track-down this sparse-matrix behavior. It's concerning (to me) that occult traces of this sporadic behavior may still be affecting our results, and so I wish I know exactly what preconditions elicit this bug (if it is a bug).
Mar
8
asked Sporadic bugs in multidimensional SparseArray objects
Dec
3
revised Can (compiled) matrix permanent evaluation be further sped-up?
tiny changes
Dec
3
revised Can (compiled) matrix permanent evaluation be further sped-up?
Geez ... final tuneup yet again
Dec
3
comment Can (compiled) matrix permanent evaluation be further sped-up?
Simon Woods, your optimizations are outstanding, and I have incorporated them (with thanks) into the code. Thank you very much.