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Mar
25
awarded  Tumbleweed
Mar
20
comment Using TimeSeriesForecast for forecasting the traffic growth
Is your problem in getting the data from the Google spreadsheet into Mathematica, or is your problem in the use of TimeSeriesForecast on the imported data?
Mar
20
comment Length of Union Incorrect?
@Jinxed: I guess it wasn't done for that reason here (see at the end of the comment), but Do[expression,{1}] at top level is a reliable way to prevent the value of the expression not only from output, but also from being stored in Out (if you just put a semicolon at the end, it doesn't get printed, but still gets stored in Out). Just writing Do[expression] (without the {1}) also works, but has the disadvantage that the syntax highlighter tells you there is a second argument missing. However assigning the resulting Null to ConnectingList doesn't seem meaningful.
Mar
20
revised Match opening and closing parentheses?
Added a note about the error handling
Mar
20
answered Match opening and closing parentheses?
Mar
19
comment Piecewise function output response interpretation
The function returns 0 if neither t >= 0 nor t <= 0. For example, if you define strange /: strange >= 0 = False; strange /: strange <= 0 = False you get a strange value which is neither >=0 nor <= 0. Consequently, if you evaluate your piecewise function with t=strange, you'll get 0 as result.
Mar
19
comment Why does this expression take a long time to evaluate?
Mathematica recognizes unsolvable problems (although that may also take time; also I think detecting all unsolvable problems is not possible in principle), but how is Mathematica supposed to know what you consider an unreasonable time? I might be interested enough in a solution that I'm willing to wait a week to get it. Note that you can tell Mathematica to stop after a certain time using TimeConstrained.
Mar
19
answered Problem with Replace function
Mar
19
answered Why are there a lot of input forms in Mathematica?
Mar
18
comment Printing names of indexed variables instead of values
Also With[{i=1},HoldForm[foo[i]]] works. As does i=1;With[{i=i},HoldForm[foo[i]]].
Mar
18
comment Strange behavior of Limit in Mathematica 9 and 10 (bug?)
Actually I'm surprised that it works at all, since strictly speaking the limit doesn't exist (you usually use a notation like $\lim_{\eta\to 0^+}$ to indicate the extra condition that you are calculating a one-sided limit). However I don't know under which conditions Mathematica considers a limit to be one-sided.
Mar
18
answered Complex conjugate
Mar
18
revised Manually choosing colors in ListPlot
added 594 characters in body
Mar
18
answered Manually choosing colors in ListPlot
Mar
18
asked What is the most efficient method to find a single eigenvector with eigenvalue that is numerically 0?
Mar
15
comment How to find Multiple Maxima/Minima
FindMaximum allows you to give a starting point for the search; if you have a rough idea where to find the maxima, you could try using that. If your function is analytic, you might also calculate the derivative and solve for places where it is zero (don't forget to look at the second derivative to distinguish maxima/minima from saddle points).
Feb
20
awarded  Popular Question
Feb
18
comment Can Mathematica's random number generation be improved?
@JEP: The headers random and chrono were added to C++ in the C++11 standard. It might be that your C++ compiler doesn't support C++11, or that you have to give a special flag to compile C++11 code.
Jan
27
awarded  Notable Question
Jan
18
awarded  Yearling