8.9 November 5, 2013
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Top new questions this week:
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[Incorrect result from
Integrate]\url{http://mathematica.stackexchange.com/questions/35324/incorre
ct-result-from-integrate}
I attempted to calculate the following integral:
Integrate[ Sqrt[x] Exp[-(x - a)^2], {x, 0, Infinity}, Assumptions -> a >
0]
1/(4 Sqrt[a])I E^(-(a^2/2)) Pi( a^2 BesselI[-(1/4), a^2/2] - (1 + a^2)
...
- asked by DumpsterDoofus (12 votes), answered by Michael E2 (10 votes)
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[Unpacked eigenvectors of complex
matrices]\url{http://mathematica.stackexchange.com/questions/35266/unpacked
-eigenvectors-of-complex-matrices}
I want to calculate eigenvectors of a Hermitian matrix. For example
$HistoryLength = 0;
n = 3000;
mat = # + ConjugateTranspose[#] &@RandomComplex[{0, 1 + I}, {n, n}];
evec = Eigenvectors[mat];
...
- asked by ybeltukov (11 votes), answered by halirutan (8 votes)
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[Wrong numerical value while exporting to a JSON
string]\url{http://mathematica.stackexchange.com/questions/35165/wrong-nume
rical-value-while-exporting-to-a-json-string}
The following code:
ExportString[{"a" -> 2000000., "b" -> 0.000001}, "JSON"]
Gives the results
{"a" : 2.e60,
"b" : 1.e-6}
The first one is obviously having a wrong numerical value. Also, ...
- asked by hwlau (11 votes), answered by hwlau (6 votes)
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[Boundary effect of Graphics3D object
Tube[]]\url{http://mathematica.stackexchange.com/questions/35331/boundary-e
ffect-of-graphics3d-object-tube}
I draw a Graphics3D object of two tubes:
Graphics3D[{Tube[{{-0.2, -1, 0}, {-0.2, 1, 0}}, 0.05],
Tube[{{0, 0, -1}, {0, 0, 1}}, 0.05]}, Boxed -> False]
And I get this:
Now I want to have ...
- asked by 9527 (10 votes), answered by ybeltukov (10 votes)
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[Monitoring progress of long
calculations]\url{http://mathematica.stackexchange.com/questions/35139/moni
toring-progress-of-long-calculations}
I've came upon a few methods of how to display "processing" information
while Mathematica is running. But, from what I've understood, this only
works in between lines of codes. Is it possible to ...
- asked by Gabriel (10 votes), answered by Simon Woods (8 votes)
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[How to find a specific color in one
picture?]\url{http://mathematica.stackexchange.com/questions/35132/how-to-f
ind-a-specific-color-in-one-picture}
In a picture, there are many different colors. How can I just want to
find the position of one color. In the following picture, if I would
like to find the coordinates of the position of blue, how can ...
- asked by KathyLL (9 votes), answered by cormullion (12 votes)
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[Is there a way to make the "Details" section of the documentation
expand by
default?]\url{http://mathematica.stackexchange.com/questions/35370/is-there
-a-way-to-make-the-details-section-of-the-documentation-expand-by-defa}
By default, the Mathematica documentation opens with the "Details"
section collapsed.
This is never what I'm looking for in fact, I've lost count of the
times I've sought help on a feature and ...
- asked by raxacoricofallapatorius (8 votes)
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Greatest hits from previous weeks:
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[xkcd-style
graphs]\url{http://mathematica.stackexchange.com/questions/11350/xkcd-style
-graphs}
I received an email to which I wanted to respond with a xkcd-style
graph, but I couldn't manage it. Everything I drew looked perfect, and I
don't have enough command over PlotLegends to have these ...
- asked by Amatya (392 votes), answered by Simon Woods (261 votes)
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[Can one identify the design patterns of
Mathematica?]\url{http://mathematica.stackexchange.com/questions/24988/can-
one-identify-the-design-patterns-of-mathematica}
... or are they unnecessary in such a high-level language?
I've been thinking about programming style, coding standards and the
like quite a bit lately, the result of my current work on a mixed ...
- asked by Verbeia (52 votes), answered by Leonid Shifrin (43 votes)
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Can you answer these?
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[Problem in exporting a plot with background to
pdf]\url{http://mathematica.stackexchange.com/questions/35131/problem-in-ex
porting-a-plot-with-background-to-pdf}
Just wondering if someone could help me for this problem. I have
utilised prolog to use a jpg image as the background of my plot in order
to compare my results with a reference plot.
Although the ...
- asked by mak maak (1 vote)
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[Series expansion: Taylor series takes huge amount of
time]\url{http://mathematica.stackexchange.com/questions/35372/series-expan
sion-taylor-series-takes-huge-amount-of-time}
I'm working on a notebook, trying to expand the root of a cubic
polynomial in Taylor series. When I type:
Series[(Sqrt[46656 a^2 - 864 (3 2^(1/3) a^(2/3) + 2 a B)^3] + 216
a)^(1/3) , {a, 0, 2}]
...
- asked by user10387 (2 votes)
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[How to define tensor fields in
Mathematica?]\url{http://mathematica.stackexchange.com/questions/35374/how-
to-define-tensor-fields-in-mathematica}
I am wondering if the is any (neat) way to define tensor fields in
Mathematica. Let me be more specific, using an example:
For instance a tensor W with 3 indices, which is anti symmetric in the
first ...
- asked by user10389 (1 vote)