================================== Top new questions this week: ==================================
[Huge bug involving MultinormalDistribution?] http://mathematica.stackexchange.com/questions/129916/huge-bug-involving-multinormaldistribution
Bug introduced in 8.0 or earlier and persisting through 11.0.1
I found a strange behavior regarding the CDF of the bivariate Normal distribution
...
- asked by fwgb (21 votes), answered by Eric Towers (19 votes)
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[GeoDistance - higher spatial resolution / precision?] http://mathematica.stackexchange.com/questions/130044/geodistance-higher-spatial-resolution-precision
I’m having a small problem with GeoDistance.
I’ve chosen a target city – San Francisco – and I’ve computed distances from SF to five other cities. Then I draw circles around each city, with radius ...
- asked by ConvexMartian (9 votes), answered by jose (4 votes)
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[How to extract the first dimension in TimeSeries?] http://mathematica.stackexchange.com/questions/129836/how-to-extract-the-first-dimension-in-timeseries
I want to extract the first dimension in TimeSeriesfor example:
So I use this code:
data = Normal@AudioLocalMeasurements[ExampleData[{"Audio", "PianoScale"}],"MFCC"]; Thread[{data[[All, 1]], ...
- asked by partida (9 votes), answered by kglr (6 votes)
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[How to recover Pauli matrices properties in Mathematica?] http://mathematica.stackexchange.com/questions/129799/how-to-recover-pauli-matrices-properties-in-mathematica
I want to do a cross or dot product involving a vector of Pauli matrices =(1,2,3); for example, x=2i or .=3I.
Is there a simple way to do these operations?
- asked by user3654016 (8 votes), answered by corey979 (10 votes)
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[Flatten sublists within a bigger list] http://mathematica.stackexchange.com/questions/130011/flatten-sublists-within-a-bigger-list
Really sorry if this question is a duplicate. I couldn’t find exactly what I was looking for.
Here is a list I have:
{{{0. + 0.1875 I, 0. + 0.105469 I, 0. + 0.03125 I, 0. + 0.00390625 I, 0. + ...
- asked by jrekier (7 votes), answered by Edmund (6 votes)
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[7-dimensional cross product] http://mathematica.stackexchange.com/questions/129863/7-dimensional-cross-product
How to define a 7-dimensional cross product?
$$\begin{aligned}\mathbf {x} \times \mathbf {y} =(x_{2}y_{4}-x_{4}y_{2}+x_{3}y_{7}-x_{7}y_{3}+x_{5}y_{6}-x_{6}y_{5})\,&\mathbf {e} ...
- asked by corey979 (7 votes), answered by Sumit (4 votes)
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[How to draw a clock-diagram?] http://mathematica.stackexchange.com/questions/129960/how-to-draw-a-clock-diagram
I found a clock-diagram in a paper, so I would like to draw it in Mathematica. The main trouble for me is the corresponding line segments on the circle.
I would let the data1 lie the outside on the ...
- asked by user123 (7 votes), answered by Feyre (7 votes)
================================== Greatest hits from previous weeks: ==================================
[How can Mathematica be used to create images like these?] http://mathematica.stackexchange.com/questions/118992/how-can-mathematica-be-used-to-create-images-like-these
Here are two examples of artistic image interpolation using just black lines:
TRIANGULATION: ANGULAR CELEBRITIES DRAWN WITH A PEN Interpolation for Triangulation-represented Digital Image
The ...
- asked by R Hall (28 votes), answered by MarcoB (29 votes)
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[How to tell Mathematica that certain variables are real/imaginary, integer-valued, etc] http://mathematica.stackexchange.com/questions/66273/how-to-tell-mathematica-that-certain-variables-are-real-imaginary-integer-value
I’m trying to expedite some quantum mechanical calculations by running them through Mathematica. Expectation values and stuff like that. When I say, for example,
u[x_] := Sqrt[2/L] * Sin[Pi * n * x / ...
- asked by Matthew Brunetti (8 votes), answered by SquareOne (6 votes)
================================== Can you answer these? ==================================
[How to Inset a legend in GeoGraphics with Scaled LegendMarkerSize?] http://mathematica.stackexchange.com/questions/130060/how-to-inset-a-legend-in-geographics-with-scaled-legendmarkersize
I have a GeoGraphics where I am using Scaled in PointSize to include size information. I want to Inset a PointLegend that describes the sizes of the points.
Outside of GeoGraphics I can do this by ...
- asked by Edmund (2 votes)
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[NumberLinePlot with Exponential] http://mathematica.stackexchange.com/questions/129938/numberlineplot-with-exponential
I have:
Clear[f, x] f[x_] = Exp[1/x] Now, the question is "where is the derivative negative?" I managed to get the Reduce command to work by adding Reals. Reduce[f'[x] < 0, x, Reals]
Which ...
- asked by David (3 votes)
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[Detect numbers on the image] http://mathematica.stackexchange.com/questions/129821/detect-numbers-on-the-image
How to detect numbers on the following image
I tried:
img=Import["http://imgur.com/TDbn7sB.png"] set = ImagePartition[img, Scaled[{1/20, 1/5}]] // Flatten
then I tried Classify[] but it ...
- asked by vito (3 votes)