================================== Top new questions this week: ==================================
[Partition a list based on specific elements? Grab the sublists beginning with a certain marker elements] http://mathematica.stackexchange.com/questions/104153/partition-a-list-based-on-specific-elements-grab-the-sublists-beginning-with-a
Say I have the list
{{a}, {0, 2, 5}, {5, 4, 1}, {a}, {1, 1, 0}, {1, 4, 2}, {3, 3, 0}, {a}, {3, 2, 0}, {1, 4, 1}}
I would like to make sublists of everything beginning with the a element till ...
- asked by Jason B (11 votes), answered by Kuba (14 votes)
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[Why does Outer sometimes return a packed array, and sometimes not?] http://mathematica.stackexchange.com/questions/104040/why-does-outer-sometimes-return-a-packed-array-and-sometimes-not
For example
In[342]:= test3 = Flatten[Outer[Plus, Range[1000], Range[1000]], 1]; // AbsoluteTiming Out[342]= {0.0198735, Null}
returns PackedArray (examined by Developer‘PackedArrayQ[test3] ...
- asked by matheorem (10 votes), answered by Mr.Wizard (7 votes)
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[Interpolation function way off] http://mathematica.stackexchange.com/questions/104037/interpolation-function-way-off
I have a simple list of data points to which I would like to fit an interpolation function. However, the results given by Interpolation[] gives an oscillating function which is not warranted by the ...
- asked by Philo (9 votes), answered by Szabolcs (14 votes)
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[How to deal with bad arguments when a function’s UpValues is a pure-function?] http://mathematica.stackexchange.com/questions/103952/how-to-deal-with-bad-arguments-when-a-functions-upvalues-is-a-pure-function
In practice, I needs to define the UpValues of a user-defined function. For instance, the operation of function like differential formula , expansion and so on.
Here, I will give a example that came ...
- asked by Shutao TANG (8 votes), answered by Mr.Wizard (2 votes)
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[Using Solve to solve the equation \(x^{1/3}=-1\)] http://mathematica.stackexchange.com/questions/104281/using-solve-to-solve-the-equation-x1-3-1
I am curious why this command returned no answers:
Solve[x^(1/3) == -1, x] Gives this output: (* {} *) I was able to get around the problem with this: Solve[Surd[x, 3] == -1, x] Which ...
- asked by David (8 votes), answered by Jens (13 votes)
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[How do you convert RGBColor to an HTML-style string?] http://mathematica.stackexchange.com/questions/103999/how-do-you-convert-rgbcolor-to-an-html-style-string
If I run some color processing function, like:
Blend[RGBColor /@ {"#DC4E00", "#000000", "#822250", "#FCC11B"}] I get back a RGBColor object: RGBColor[0.5901960784313726, 0.29901960784313725, ...
- asked by d8uv (8 votes), answered by d8uv (9 votes)
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[ReplaceAll behavior change from 10.2 to 10.3] http://mathematica.stackexchange.com/questions/104354/replaceall-behavior-change-from-10-2-to-10-3
Executing:
replace[res_] := res /. {a_Integer, b_Integer} :> (a + b); l1 = <|"respID" -> {1,2} , "key2" -> <|"key2" -> {2, 1}|>|>; l2 = {"respID" -> {1,2} , "key2" -> ...
- asked by Murta (7 votes)
================================== Greatest hits from previous weeks: ==================================
[Drawing a square root spiral] http://mathematica.stackexchange.com/questions/66969/drawing-a-square-root-spiral
Here is a start. I’m looking for a nice way to draw it.
Graphics[{EdgeForm[Black], White, Polygon @ {{0, 0}, {-1, 0}, Sqrt[2] {Cos[#], Sin[#]} &[Pi - (ArcCot[1])]}, Polygon @ {{0, ...
- asked by mathe (22 votes), answered by Bob Hanlon (16 votes)
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[Mathematica 10.0.x freezes in Initializing kernels] http://mathematica.stackexchange.com/questions/92931/mathematica-10-0-x-freezes-in-initializing-kernels
Bug caused by paclet update and fixed by paclet update.
I updated to Windows 10 and have been running Mathematica fine on it for over a month. For some reason, it has just stopped working. I don’t ...
- asked by mitcheljh (67 votes), answered by ilian (84 votes)
================================== Can you answer these? ==================================
[How to find and show a point value on the line?] http://mathematica.stackexchange.com/questions/104384/how-to-find-and-show-a-point-value-on-the-line
Manipulate[ Module[{eqns, f}, eqns = {y'[x] == aa3*y[x]^3 + aa2*y[x]^2 + aa1*y[x] + aa0[t] + bb[t]/y[x], y[0] == 15}; f = NDSolve[eqns, y, {x, 0, 1}][[1, 1, -1]]; Plot[f[x], {x, 0, ...
- asked by user37037 (1 vote)
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[Is it possible for librarylink function to be Listable like that in Compile?] http://mathematica.stackexchange.com/questions/104382/is-it-possible-for-librarylink-function-to-be-listable-like-that-in-compile
We know in Compile, there is an Option RuntimeAttributes ; Listable which can let the compiled function easily explore the power of thread parallelization.
So is it possible for a librarylink ...
- asked by matheorem (2 votes)
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[How could get all escape characters in Mathematica?] http://mathematica.stackexchange.com/questions/104299/how-could-get-all-escape-characters-in-mathematica
I am evaluating expression by using KernelLink.
But the kernel will be suspended endless when meets a invalid escape character.
a\abc, \[badEscape] for example.
So I have to filter all the invalid ...
- asked by Michael (3 votes)