================================== Top new questions this week: ==================================
[Automatic edX Pdf Handout creator] https://mathematica.stackexchange.com/questions/159065/automatic-edx-pdf-handout-creator
I am trying to make an automatic handout creator for my courses on edX. It took me a long time to do it...
(If you don’t know edX: https://www.edx.org/
I wrote a program that adds to each slide ...
- asked by totyped (14 votes), answered by M. Stern (4 votes)
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[The area of a unit disk is \(2\pi \)? (NIntegrate over a numerical region)] https://mathematica.stackexchange.com/questions/159194/the-area-of-a-unit-disk-is-2-pi-nintegrate-over-a-numerical-region
EDIT: The example below concerns the construction of a numerical region from a general boolean-valued function. The question of how to properly construct such a region has been answered below (by M. ...
- asked by Will.Mo (13 votes), answered by m_goldberg (12 votes)
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[How many Capitals are closer to me than my own?] https://mathematica.stackexchange.com/questions/159041/how-many-capitals-are-closer-to-me-than-my-own
A recent question in chat about "When you are in Aachen, Germany, five other countries capitals are closer than Berlin." triggered me to try to write something to find the cities automatically for ...
- asked by pH13 - Yet another Philipp (9 votes), answered by J. M. (4 votes)
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[How to SortBy Last and in Reverse order?] https://mathematica.stackexchange.com/questions/159295/how-to-sortby-last-and-in-reverse-order
I am looking at the two functions SortBy and ReverseSort.
SortBy[{{1, 2, 3}, {2, 3, 1}, {3, 1, 2}, {2, 2}}, Last] {{2, 3, 1}, {2, 2}, {3, 1, 2}, {1, 2, 3}}
How do I sort this by the ...
- asked by Chen Stats Yu (7 votes), answered by J. M. (7 votes)
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[CatalanNumber[-1] formula on functions.wolfram.com unequals result from Mathematica] https://mathematica.stackexchange.com/questions/159143/catalannumber-1-formula-on-functions-wolfram-com-unequals-result-from-mathemat
The formula for CatalanNumber[-1] on this functions.wolfram.com page gives: -(1/2) whereas CatalanNumber[-1] directly evaluated gives? -1
- asked by axelclk (7 votes), answered by J. M. (8 votes)
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[DiscretizeGraphics issues with transformations] https://mathematica.stackexchange.com/questions/159035/discretizegraphics-issues-with-transformations
I noticed DiscretizeGraphics does not work correctly with transformed Graphics such as
Graphics[Rotate[Rectangle[], 30ř]]
Both using Rotate and GeometricTransformation together with ...
- asked by Sascha (7 votes), answered by aardvark2012 (5 votes)
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[How to locate a stream line starting from a saddle point?] https://mathematica.stackexchange.com/questions/159093/how-to-locate-a-stream-line-starting-from-a-saddle-point
I read in a table of gradient vectors and plot using the ListStreamPlot. I want to locate and color the line that represents the "boundary" of the flux. A flux line that 1)starts from a saddle point ...
- asked by Jun Liu (6 votes)
================================== Greatest hits from previous weeks: ==================================
[What are the most common pitfalls awaiting new users?] https://mathematica.stackexchange.com/questions/18393/what-are-the-most-common-pitfalls-awaiting-new-users
As you may already know, Mathematica is a wonderful piece of software. However, it has a few characteristics that tend to confuse new (and sometimes not-so-new) users. That can be clearly seen from ...
- asked by Dr. belisarius (407 votes), answered by Michael E2 (238 votes)
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[Image processing: Floor plan - detecting rooms’ borders (area) and room names’ texts] https://mathematica.stackexchange.com/questions/19546/image-processing-floor-plan-detecting-rooms-borders-area-and-room-names-t
Here is a simple building floor plan. I would like to derive the rooms as (rectangular) components and the names of the rooms. This is very common representation of building floor plans.
The ...
- asked by s.s.o (52 votes), answered by nikie (52 votes)
================================== Can you answer these? ==================================
[Editing pdf files with Mathematica] https://mathematica.stackexchange.com/questions/159074/editing-pdf-files-with-mathematica
As an example, consider this pdf file.
Would it be possible to edit the pdf, such as removing a logo, the page numbering and even frames, and save the result as a pdf? I would like to keep the pdf ...
- asked by anderstood (4 votes)
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[A question concerning a generalization of HypergeometricPFQ] https://mathematica.stackexchange.com/questions/159242/a-question-concerning-a-generalization-of-hypergeometricpfq
I have been trying to find explicit formulas for the real and imaginary parts of the Wolfram function EllipticK. An interesting formula for the real part of EllipticK evaluated at a complex number is ...
- asked by John M. Campbell (1 vote)
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[Export cdf does not work in MathKernel command line] https://mathematica.stackexchange.com/questions/159210/export-cdf-does-not-work-in-mathkernel-command-line
I am using Mathematica through command line MathKernel. I am not trying to draw any graphics in the console. But I should be able to export things a CDF. Why can’t I export a CDF through command line ...
- asked by Neel Basu (2 votes)