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4.46 Tuesday, January 31, 2017

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Top new questions this week: 
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[How to get a specified number of points that are nearly equally spaced in a closed rectangle] http://mathematica.stackexchange.com/questions/136447/how-to-get-a-specified-number-of-points-that-are-nearly-equally-spaced-in-a-clos

TriangulateMesh is almost the right tool for this problem. For example, 

numb = 113; 
region = BoundaryMeshRegion[{{0, 0}, {3, 0}, {3, 1}, {0, 1}}, Line[{1, 2, 3, 4, 1}]]; 
mesh =  ...

- asked by Ted Ersek (17 votes), answered by Szabolcs (15 votes)

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[Tutorial on creating publication quality documents in Mathematica?] http://mathematica.stackexchange.com/questions/136426/tutorial-on-creating-publication-quality-documents-in-mathematica

Are there books or tutorials that walk one through creating a professional publication quality notebook?

For example, I would like to create a two column article using an IEEE format. Is this ...

- asked by Doug Kimzey (13 votes)

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[Type conversions] http://mathematica.stackexchange.com/questions/136476/type-conversions

I have the following list, each element of which is of type string:

"abc", "def","2","ghi","7"

Is there an efficient way to arrive at:

"abcdef", 2,"ghi",7

where adjacent alphabetic elements ...

- asked by Suite401 (12 votes), answered by Bob Hanlon (8 votes)

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[Alternatives and the Flat attribute] http://mathematica.stackexchange.com/questions/136157/alternatives-and-the-flat-attribute

When a head has the attribute Flat then the pattern matcher is able to pick out a sublist of its arguments, even though the structure doesn’t match: 

SetAttributes[f, Flat]; 
f[a, b, c, d] /. f[a, b]  ...

- asked by Martin Ender (11 votes)

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[Assign names to Dataset columns] http://mathematica.stackexchange.com/questions/136422/assign-names-to-dataset-columns

I am constructing a dataset like so: 

data = Dataset[AssociationThread[Keys[characterCounts], charFrequencies]]

which gives me a dataset that looks like this:

This is all fine, but as you can ...

- asked by damjandd (10 votes), answered by Kuba (10 votes)

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[Dataset interferes with SeedRandom] http://mathematica.stackexchange.com/questions/136339/dataset-interferes-with-seedrandom

This seems like a pretty awful bug: 

SeedRandom[1]; 
RandomInteger[10, 10] 
 
Out: {1,4,0,7,0,0,8,6,0,4} 
 
 
While: 
 
SeedRandom[1]; 
Dataset[<|a -> 1, b -> 2|>]; 
RandomInteger[10, 10] 
 
Out:  ...

- asked by Mohammed AlQuraishi (10 votes)

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[Problem with integrating DiracDelta] http://mathematica.stackexchange.com/questions/136214/problem-with-integrating-diracdelta

I thought I had found a bug in Mathematica and reported it already in version 9, since it wasn’t fixed in version 10 or 11 I reported it two more times but I never get any reply whatsoever so I’m ...

- asked by user3777022 (10 votes), answered by Julien Kluge (8 votes)

================================== Greatest hits from previous weeks: ==================================

[Assign the results from a Solve to variable(s)] http://mathematica.stackexchange.com/questions/6669/assign-the-results-from-a-solve-to-variables

I understand Mathematica can’t assign the results of a Solve to the unknowns because there may be more than 1 solution. How can I assign the 4 values of following result to variables?

- asked by stevenvh (30 votes), answered by Artes (22 votes)

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[How to create a fascinating QR code like this?] http://mathematica.stackexchange.com/questions/120041/how-to-create-a-fascinating-qr-code-like-this

Check the facinating QRCode in my profile page here

You can find that this QRCode is some sort of intriguing as the QRCode is a IMAGE ITSELF!!!

So my question is, how to create such a QRCode ...

- asked by Wjx (24 votes), answered by Wjx (19 votes)

================================== Can you answer these? ==================================

[How to Approximate at Non-differentiable Point (forced Series Expansion around Branch Cut)] http://mathematica.stackexchange.com/questions/136395/how-to-approximate-at-non-differentiable-point-forced-series-expansion-around-b

I need a numerical approximation around some functions at \(x = 0^{-}\) from the left side, where \(x = 0\) is unfortunately the right end of the domain (in the reals) so the functions are not ...

- asked by Lee David Chung Lin (3 votes)

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[3D reconstruction of a 2D SEM image] http://mathematica.stackexchange.com/questions/136284/3d-reconstruction-of-a-2d-sem-image

I am curious if Mathematica could do reconstruction of a 2D SEM image into a 3D. It is the same what can be done by MountainsMap SEM software http://www.digitalsurf.fr/en/mntsem.html

Visually it ...

- asked by Viacheslav Plotnikov (4 votes)

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[Help needed in Understand the following program in solving a stiff nonlinear differential equation] http://mathematica.stackexchange.com/questions/136607/help-needed-in-understand-the-following-program-in-solving-a-stiff-nonlinear-dif

I am trying to solve a particular Cauchy problem given by

I found from a particular paper that the solutions looks like

For the auxiliary conditions

For only specific values of \(a_{i}\)

I ...

- asked by kernel_panic (1 vote)

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