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Jan
9
comment Why is my data 10 times slower than random data when doing matrix multiplication
Computing the following Tally[ByteCount /@ Flatten[tb]] shows that some of your numbers have different byte counts due to large exponents. I doubt the data can be packed.
Jan
4
awarded  Enlightened
Jan
4
awarded  Nice Answer
Jan
4
revised Rapid density estimation and rendering of decision regions
deleted 1 character in body
Jan
4
comment Rapid density estimation and rendering of decision regions
I'm glad to help.
Jan
4
answered Rapid density estimation and rendering of decision regions
Jan
1
answered Extract Specific Dates from DateList
Dec
25
comment Generate nonoverlapping random circles
Related mathematica.stackexchange.com/questions/2594/…
Dec
24
revised Double application of NIntegrate produces unexpected error messages
deleted 16 characters in body
Dec
24
answered Double application of NIntegrate produces unexpected error messages
Dec
24
comment Fitting higher order ARIMA models hangs, never completes
@TomHayden you don't want to resample but want to assume regularity then just extract the values and fit with those.
Dec
24
comment What are the differences between these functions when used for NMaximize?
I seriously doubt repeated calls to NumericQ is the problem. It is likely that without NumericQ NMaximize is able to come up with an optimized expression for your function symbolically which it caches. With NumericQ it can't optimize/evaluate the expression symbolically.
Dec
23
comment Interpretation of CopulaDistribution
The reason for my down vote is that I don't feel this addresses the question at hand and would be more fitting as a comment or in chat.
Dec
22
comment Fitting higher order ARIMA models hangs, never completes
I think this might be considered a bug then. By setting TemporalRegularity to true it should completely ignore the actual time stamps in the fitting.
Dec
22
revised Plotting CSV files with UTC Universal Time
deleted 27 characters in body
Dec
22
answered Plotting CSV files with UTC Universal Time
Dec
21
comment Why is Likelihood / LogLikelihood not working?
After addressing @Sjoerd C. de Vries point you need to add another set of list braces around {x1,x2,x3,x4} it is expecting a dataset not a single point and multinomial distributions are multivariate.
Dec
21
comment Time Series Analysis - How does it Difference?
Yes, it uses the orders of the model to do the differencing. I will say that R still has its place, where it lacks in automation and sometimes ease of use it makes up in completeness. Mathematica's time series functionality is great but still immature so there will be things you can't easily do that may cause you to turn to R. If you go there I recommend starting with auto.arima which is the closest I've seen to TimeSeriesModelFit. Incidentally you can get the best of both worlds by getting familiar with RLink.
Dec
20
revised Time Series Analysis - How does it Difference?
added 172 characters in body
Dec
20
answered Time Series Analysis - How does it Difference?