2,431 reputation
11327
bio website jpl.nasa.gov
location Pasadena, CA
age 47
visits member for 2 years, 3 months
seen 12 mins ago

Feb
3
reviewed Excellent How can I set different opacity values for the background of a ListPlot
Feb
3
reviewed Excellent How to get StreamPlot to draw many hundreds of streamlines?
Feb
3
reviewed Satisfactory While-Loop Linear Projection
Feb
3
comment Strange behaviour of OutputResponse
@EdMendes: FYI, I've noticed you're fairly new to this forum and that you haven't "accepted" any answers to your questions. If you receive useful answers to your questions, you should vote them up. If you receive an answer which truly satisfies your question, you should "accept" it.
Feb
3
comment Documentation searches hang frequently: Anyone else dealing with this?
FYI, I cannot reproduce this behavior on MMA v9.0.1 under Mac OS X.
Feb
3
comment Strange behaviour of OutputResponse
I'm also running v9.0.1 on Mac OS X and I get the same results you describe when I run your example on MMA v8. Without spending too much time on this, it looks to me like MMA produces equivalent but different symbolic results under 8 and 9, and the differences become important when you apply Chop. For that reason (and many others), you should exercise caution when "Chopping". I generally only use Chop when I'm trying to display numbers in a "clean" manner, but never in the midst of a calculation.
Feb
3
revised Strange behaviour of OutputResponse
added 566 characters in body
Feb
3
answered Strange behaviour of OutputResponse
Jan
31
comment Incomplete implementation of units?
@geraldcecil: It looks like the example you listed now works in MMA 9.0.1
Jan
31
comment Are Mathematica 9 units really slow?
Just ran the example with Mathematica 9.0.1 on a Mac Pro 2x2.93 GHz Quad-Core Xeon with 8 GB 1066 MGz DDR3, OSX 10.7.4; took about 9 sec. I seem to remember running the example under MMA9 and getting roughly the same performance described above, so I think units speed may have gotten a boost in MMA9.0.1.
Jan
31
comment NumberForm and units
The problem I described in the question appears to have been resolved in Mathematica 9.0.1
Jan
31
comment How to Debug Missing[NotAvailable] error for Social Media Data
A quick check of Mathematica 9.0.1 seems to show that the problems with SocialMediaData (at least for Facebook) have been fixed.
Jan
31
answered How can I expand a inequality with Abs
Jan
26
revised Since installing mathematica 9 I can't import certain tiffs
Formatted code as code...
Jan
26
suggested suggested edit on Since installing mathematica 9 I can't import certain tiffs
Jan
25
comment What are the most common pitfalls awaiting new users?
Suggestion: If appropriate to the problem, force Mathematica to use approximate numerical algorithms to avoid the computational overhead of their symbolic counterparts. There are several ways to do this (e.g., NIntegrate vs. Integrate, using real approximate numbers instead of integers in equations, etc).
Jan
19
awarded  Citizen Patrol
Jan
17
awarded  Yearling
Jan
17
comment Why does Simplify ignore an assumption?
As does Simplify[x^2+y^2,x^2+y^2==a], and Simplify[x+y,x+y==Cos[a]] returns Cos[a]
Jan
16
comment Why are the elements of plots separated in exported PDFs?
Did you send the PDF to the Omnigroup? They're a pretty responsive bunch and I wouldn't be surprised if you get an answer.