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

Feb
13
awarded  Notable Question
Feb
4
awarded  Enlightened
Feb
4
awarded  Nice Answer
Jan
24
comment Solving a linear system
The first equation in Solve does not exactly match the OP's equation (40-->4), so the posted result is not correct.
Jan
22
comment Coloring the points in a ListPlot with the value of another function
Related question: mathematica.stackexchange.com/questions/1300/…
Jan
17
awarded  Yearling
Jan
14
answered How to solve an equation with two variables in Mathematica
Dec
17
revised Find the best parallel lines to a given data set
Removed parallel tag.
Dec
16
revised How to find the area between two curves
Corrected minor syntax error
Dec
16
comment First 10 digits of $\pi$ without rounding
3.141592653 :-)
Dec
8
answered Finding the square root of a squared number?
Dec
2
revised How to improve the performance of this code
added 1201 characters in body
Dec
2
comment How to improve the performance of this code
I also forced innerInt to only accept numeric quantities and I set it running, but I have no idea what a "reasonable" amount of execution time is. It's going now...
Dec
1
answered How to improve the performance of this code
Nov
22
comment Integrate perfomance
I don't know why it's slower, but if this is a calculation you perform more than once, you may benefit by storing the results (i.e., use b[i_]:=b[i]=integral).
Nov
22
comment How to insert trigonometric functions into matrices' vector components?
I'm still confused because A.x represents the matrix/vector multiplication of A and x, which in your example would result in {2 Sin[phi],4}, but it seems you want the first term replaced with Sin[2]. Is that correct?
Nov
22
comment How to insert trigonometric functions into matrices' vector components?
Does phi have a value? Are you trying to use it as an argument. Sorry, but I guess I still don't understand.
Nov
22
answered How to insert trigonometric functions into matrices' vector components?
Nov
19
comment when using FileDate----The Creation date of a file is not available on Macintosh and Unix?
I can confirm that Mathematica returns a file date creation on my Mac (OS X 10.8.5, MMA v9.0.1).
Nov
4
comment Looking for mismatches between two lists
I always forget about Unitize. Very nice.