4.42 Tuesday, February 28, 2017

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Top new questions this week: 
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[Parallelize Map and ParallelMap] http://mathematica.stackexchange.com/questions/138476/parallelize-map-and-parallelmap

Bug introduced in 8.0 and persisting through 11.0.1 or later

It is stated in the documentation that

  Parallelize[Map[f, expr]] is equivalent to ParallelMap[f, expr].

But what about these ...

- asked by Mher (29 votes), answered by Szabolcs (23 votes)

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[Can we intelligently control evaluation in Thread?] http://mathematica.stackexchange.com/questions/138661/can-we-intelligently-control-evaluation-in-thread

This is a bid at creating a canonical Q&A.

Many questions have been asked that come down to the fact that Thread evaluates its first argument before threading is attempted. In a few minutes I ...

- asked by Mr.Wizard (27 votes), answered by Mr.Wizard (21 votes)

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[Learn Mathematica (Wolfram) Language in one day] http://mathematica.stackexchange.com/questions/138366/learn-mathematica-wolfram-language-in-one-day

Currently I am trying to learn Python. Searching for relevant material I came across

X in Y minutes

and books with titles such as Learn Python in one day, in 24 hours, etc.

Similar material exists ...

- asked by dimitris (23 votes), answered by masterxilo (5 votes)

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[Puzzle 20 People to consume 20 units of food under constraints] http://mathematica.stackexchange.com/questions/138637/puzzle-20-people-to-consume-20-units-of-food-under-constraints

I am learning Mathematica because I love it. I also love solving puzzles so I think it would be a nice way to learn Mathematica through puzzles. This is first puzzle in series I intend to solve.

So ...

- asked by Jawad_Mansoor (14 votes), answered by Mr.Wizard (18 votes)

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[Compute the curvature of a bent stack of paper] http://mathematica.stackexchange.com/questions/138583/compute-the-curvature-of-a-bent-stack-of-paper

My goal is to link the curvature of a bent stack of paper in a wind tunnel to its bending modulus \(B\), knowing all the other physical properties. To this end, I would like to reproduce the numerical ...

- asked by yketa (12 votes), answered by xzczd (8 votes)

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[WordOrientation does not work in v11?] http://mathematica.stackexchange.com/questions/138811/wordorientation-does-not-work-in-v11

Bug introduced in 11.0.1

It seems that WordOrientation does not work in v11. The sample code

input = ExampleData[{"Text", "AliceInWonderland"}]; 
WordCloud[input, WordOrientation -> "Random"]

...

- asked by Lem.ma (11 votes)

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[Code request: Make "copy formatted code" bulletproof] http://mathematica.stackexchange.com/questions/138436/code-request-make-copy-formatted-code-bulletproof

With the GeneralUtilities‘PrintDefinitions functions comes a usable code formatting engine. On this site, most of the time we share code. I believe it would be awesome to have a robust button that ...

- asked by halirutan (10 votes)

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

[Why round to even integers?] http://mathematica.stackexchange.com/questions/2116/why-round-to-even-integers

According to the Mathematica help:

Round rounds numbers of the form x.5 toward the nearest even integer.

For example:

Round[{0.5, 1.5, 2.5, 3.5, 4.5}] 
 
 
gives 
 
{0, 2, 2, 4, 4}

What’s the ...

- asked by wxffles (61 votes), answered by Per Alexandersson (37 votes)

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[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 (33 votes), answered by Artes (24 votes)

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

[Plotting a 2D slice of a 3D function] http://mathematica.stackexchange.com/questions/138808/plotting-a-2d-slice-of-a-3d-function

I'd like to plot (Sqrt[x] + Sqrt[y] + Sqrt[z])^2 in a slice defined by x+y+z=1

I figured out similar problem 5 years ago, but it was a bit involved, ie, needing 10 lines of Mathematica code. Is there ...

- asked by Yaroslav Bulatov (2 votes)

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[Export of Plot3D function completely different from the render within Mathematica] http://mathematica.stackexchange.com/questions/138412/export-of-plot3d-function-completely-different-from-the-render-within-mathematic

I am plotting a simple function:

Plot3D[-RandomReal[{0, 10}] Cos[x/3] Cos[y/3], 
  {x, -, }, {y, -, }, 
  Axes -> False, 
  Boxed -> False, 
  BoundaryStyle -> None, 
  Mesh -> None]

...

- asked by waffl (1 vote)

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[CreateExecutable returns $Failed] http://mathematica.stackexchange.com/questions/138328/createexecutable-returns-failed

My platform is win10 64b, Mathematica 11 and Visual Studio 2015. When I apply CreateExecutable, it always returns $Failed. The configuration is right. Please what is the problem? Thank you.

...

- asked by tu312 (1 vote)