2,596 reputation
11328
bio website jpl.nasa.gov
location Pasadena, CA
age 47
visits member for 2 years, 6 months
seen 1 hour ago

Jun
4
comment Switching the ordinate and abscissa causes problem in `ParametricPlot`
It worked because your list effectively requested two parametric plots (new[x] and x), though the second parametric plot was underspecified and thus ignored by MMA.
Jun
4
comment How to calculate this integral?
I'm also unable to get MMA to calculate the integral symbolically. However, you can calculate it numerically for a given value of a: NIntegrate[(Exp[-a x] (x^2 - 1)^(13/2)/x^10) /. {a -> 0.1}, {x, 1, [Infinity]}]
Jun
3
comment How to compute this triple integral?
Heh. Sometimes it's better to be lucky than to be smart!
Apr
25
comment How to solve a non-linear equation?
I should leave this to the mathematicians, but I seriously doubt you're going to find a symbolic solution. If you want a numeric solution, you need to specify the values of a, b, c...
Apr
25
comment How to solve a non-linear equation?
Ummm…are you looking for a symbolic solution in terms of the unknowns or a numerical solution (in which case you need to provide values for the a, b, c…). Regardless, what makes you think there is a solution?
Apr
25
comment Histogram scale error when using DistributionChart
It seems as though there's a "minimum" bar size for HistogramDensity, which definitely distorts the distribution. Unfortunately, I can't offer a suggestion for eliminating the problem (other than to choose a different approach to plotting the distribution, such as SmoothDensity).
Apr
12
comment I don't understand ListCorrelate!
You can learn about the function ListCorrelate in the Mathematica documentation. However, your question is ambiguous: do you want to know what ListCorrelate does? Do you want to know what Subscript does? Do you want to know how the code you posted relates to solving PDEs? Do you want to know what {1,2} represents? You need to be more precise.
Mar
30
comment Evaluate integral of a series
@Lawerance: if you are satisfied with the answer you received from Jens (and it seems you are), then please Accept his 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/…
Dec
16
comment First 10 digits of $\pi$ without rounding
3.141592653 :-)
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...
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
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.
Nov
4
comment Looking for mismatches between two lists
@Kuba: I don't think so, based on the example given below.
Aug
14
comment Insert a Quantity Unit literal in TraditionalForm
This may be related: mathematica.stackexchange.com/questions/15634/…
Apr
21
comment Sqrt — how to get negative branch?
But Solve[9==x^2,x] returns both solutions, so I don't think there's an inconsistency.