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10
votes
1answer
317 views

Cancellation of common terms

Can someone explain why the term A in case 2 does not get canceled out when case 1 does? I use "9.0 for Microsoft Windows (64-bit) (January 25, 2013)" ...
0
votes
0answers
145 views

ParametricNDSolve: Parameter inside UnitStep leads to longer integration times

I have found one of the most annoying issues in ParametricNDSolve. When a parameters occurs inside UnitStep (and Piecewise and If) the integration takes much longer time. I illustrate this by an easy ...
8
votes
1answer
153 views

AndersonDarlingTest and DistributionFitTest Leaking Memory

I believe AndersonDarlingTest and probably all other tests are keeping a copy of data somewhere and not freeing it: ...
6
votes
1answer
111 views

Why do certain fractional values in TriangleWave not evaluate?

While answering another question I discovered that TriangleWave does not automatically evaluate when given certain fractional values, specifically fractions with a ...
5
votes
2answers
219 views

Reduce with Integer domain, but receive a rational solution

Bug introduced in 6.0 and fixed in 10.0 I want to find the integer values $k$ so that D[f[x], x] has integer solutions. I tried ...
3
votes
1answer
118 views

Cannot use CTRL + F and UN/COMMENT

I would like to ask a question with Mathematica 9.0.1. I find that both FIND: CTRL + F UN/COMMENT: ALT + / become unavailable. Pressing the shortkey or selecting from the menu could not activate ...
10
votes
1answer
324 views

How does LocationTest choose its “AutomaticTest”?

Is there a way of determining how LocationTest chooses its "AutomaticTest"? Sometimes it's clear from the ...
7
votes
3answers
148 views

Disable rounding up of PolarAxesOrigin

How to disable rounding up the radius which is used to calculate the origin of the polar axes with the option PolarAxesOrigin? Example: ...
2
votes
0answers
42 views

The value of PageWidth doesn't work for saving as HTML?

CellPrint@Cell["Test","Text",PageWidth->300,Background->Red] And I got this snippet of HTML code: ...
6
votes
0answers
170 views

Issue with FindCurvePath

I have a problem with the function FindCurvePath. In some cases it crashes the Mathematica 9 Kernel. Here an example, where it crashes the kernel: ...
24
votes
2answers
617 views

Graphics elements do not line up perfectly in exported PDFs

Bug introduced in version 9.0 and persisting through 10.3 Graphics elements do not always line up perfectly in exported PDFs using "Save As..." method. Take, for example: ...
6
votes
0answers
207 views

Documentation for user-defined functions; undocumented documentation feature?

I stumbled on some strange behaviour when trying out the new function template and documentation features, now purportedly working in v 9.0.1. I defined a function ...
14
votes
4answers
263 views

Unexpected dots from Line

I have noticed cases where Line produces dots in a graphics object when I think it shouldn't. The first of these is: ...
4
votes
1answer
126 views

Is there really a bug in the following code, taken from the reference documentation for PetersenGraph?

Bug introduced in 9.0.0 and fixed in 10.0.0 PetersenGraph[5, 2, EdgeLabels -> {8 \[UndirectedEdge] 9 -> "hello"}] appears to evaluate perfectly, as ...
2
votes
1answer
113 views

Manual CellGrouping option causes crash at cell evaluation

Update: Try to reproduce this behaviour with CellGrouping set to manual. To do that: either evaluate ...
9
votes
2answers
105 views

Infix strange behaviour

Bug introduced in 7.0 and fixed in 10.0.0 Maybe this is a bug or maybe Infix acts differently than the other functions. The fact is that both: ...
29
votes
1answer
337 views

Why is multidimensional Reverse slow?

Bug introduced in 6.0 or earlier and persisting through 10.3.1 I have found that multidimensional Reverse is ~10 times slower than exact ...
5
votes
0answers
193 views

Strange Integrate behavior (a bug!)

The following two calculations should give the same result. After all, integration is a linear operation. I have pasted the code below in case you want to play with it. ...
17
votes
1answer
259 views

Bug in RepeatedNull?

RepeatedNull appears to be buggy (versions 8.0, and 9.0). Define f as follows: ...
11
votes
1answer
434 views

Inconsistent results of second derivative of inverse fourier transform

Bug introduced in 9.0 or earlier and persisting through 10.2.0 I am trying to get the Green's function of a toy diffusion equation $$\frac{\partial^2 u(x,t)}{\partial x^2} = ...
10
votes
2answers
155 views

Rasterize uses default stylesheet if ImageSize is specified

If I make a style definition which affects GraphicsBox, the style is used by Rasterize unless I specify an explicit ...
21
votes
2answers
359 views

Kernel inexplicably hangs if I define a pure function without suppressing output

Bug introduced in 9.0 and fixed in 10.0.2 Save any unsaved work before trying as it may crash Mathematica and other programs by filling up the memory! In v9.0.1.0 on OSX 10.8.5, if I start a new ...
4
votes
0answers
242 views

Syntax error for optional pattern, but only in debugger

This expression (explained here by Leonid) evaluates fine unless Evaluation->Debugger is enabled: h[x : (_Integer) : 1] := x Syntax::sntxf: "x:" cannot be ...
4
votes
1answer
289 views

Numerical errors/inaccuracies in ProductLog

Context In cosmology, a fairly accurate model to describe the gravitational potential, $\psi(r)$ of dark matter halos is given by $\psi( r)=\log(1+r)/r$. ...
20
votes
1answer
590 views

Incorrect result from Integrate

Bug introduced in 8.0 and fixed in 10.0 I attempted to calculate the following integral: ...
8
votes
2answers
492 views

Goto and Compile

...
5
votes
1answer
117 views

Apparently contradictory output from Series and D

I defined a function as: g[b_] := Integrate[f[n]Exp[-b DA (n.u)^2], n] Obviously D[g[b], b] /. b -> 0 gives ...
12
votes
3answers
291 views

Wrong numerical value while exporting to a JSON string

The following code: ExportString[{"a" -> 2000000., "b" -> 0.000001}, "JSON"] Gives the results ...
4
votes
1answer
183 views

Forcing optimal solution for FindShortestTour

I use FindShortestTour as explained here and it works nicely for a small number of cities. However when I try this with as little as 16 cities, the given tour isn't ...
1
vote
0answers
103 views

LinearProgramming errors

I have a family of equations I want to solve over the non-negative integers. One particular instance of it is this. ...
5
votes
1answer
301 views

ListDensityPlot crashes the kernel

ListDensityPlot[ Flatten[Table[{i, j, Sin[i + j]}, {i, 1, 20}, {j, 1, 20}], 1]] gives the expected result, but a linear scale crashes my kernel (please save your ...
7
votes
1answer
387 views

ReadList can't read correctly

Bug introduced in 9.0 and fixed in 9.0.1 I'm trying to load some data into Mathematica from some files generated by fortran. But ReadList seems can't get the number correct. Here is a simplified ...
8
votes
0answers
156 views

The same analytical expression gets inconsistent FourierTransform results

I have an expression which is just a linear combination of plane waves, and I'd like to calculate FT of it. I know what I will get should be a bunch of delta functions, but it turns out Mathematica ...
18
votes
5answers
1k views

Mathematica gives wrong result while Wolfram|Alpha is correct

Why does Mathematica and Wolfram|Alpha give different results based upon the same code? I know Wolfram|Alpha's 7.85 is correct.
21
votes
2answers
347 views

Plotting a defined function gives different results from plotting the function directly

Consider the following piece of code: function[t_]:=Exp[-9 t^2]; LogLogPlot[{function[t],Exp[-9 t^2]},{t,.01,100}] I expect the two plots to exactly overlap each ...
4
votes
3answers
253 views

Why the inequality does not take into account the domain?

I have this inequality: Reduce[(4000-1000k)/(k-4) < 0] and the answer is k ∈ Reals I would expect ...
9
votes
1answer
297 views

Mathematica: computing a difficult integral

I am trying to compute the following integral: Integrate[Exp[Sum[-((cw λ - b[i])^2/(2 σ^2)), {i, 1, n}]], {cw, 0, 1}] And currently Mathematica outputs ...
6
votes
1answer
731 views

Issue with NSolve

I defined the following function: sw[ θ_, ϕ_, h_] = 1/2 Sin[2 (ϕ - θ)] + h Sin[ϕ] Based upon whether I use Solve or NSolve, ...
7
votes
1answer
108 views

Setting PropertyValue for VertexWeight is not persistent

Bug introduced in 9.0.1 or earlier and fixed in 10.0 ...
9
votes
1answer
347 views

Deconvolution of Image3D object using ImageDeconvolve

I am trying to get the ImageDeconvolve function to work with Image3D objects. In the documentation of ImageDeconvolve it says: ...
1
vote
1answer
143 views

ParallelTable of ParametricNDSolve objects fail

There seems to be a problem with ParametricNDSolveValue togeteher with ParallelTable First we create a ParametricNDSolveValue object ...
1
vote
1answer
190 views

ParametricNDSolve: Fails to differentiate an matrix differential equation

It seems like there is a problem with differentiating a ParametricNDSolve object when the underlying system contains an matrix differential equation. Create a simple ParametricNDSolveValue object ...
4
votes
0answers
84 views

Error with String patterns producing Removed[“$$Failure”]

While working on How to capitalize the first letter of each word in a string and trying to understand why certain characters were not considered letters I tried this: ...
11
votes
1answer
287 views

Possible bug with second argument of Dynamic

Bug fixed in V 10. According to the documentation, Dynamic Details & Options section, especially: For interactive mouse operations ...
7
votes
3answers
527 views

Poor quality Rasterize output when Background -> None

I am attempting to generate partially transparent images for PNG Export, but seem to run to the following issue. If I Rasterize ...
9
votes
1answer
137 views

FindHamiltonianCycle is not invariant to edge permutation

Bug introduced in 9.0.1 or earlier and fixed in 10.0 Found this bug-like behaviour today: if the order of edges is changed so that VertexList does not return the ...
10
votes
1answer
143 views

Bug in GeneratingFunction?

Bug introduced in 7.0 and fixed in 9.0.0 According to the documentation GeneratingFunction[a[n],n,x]==Sum[a[n]x^n,{n,0,Infinity}] However, for $a_n=1/(n+2)$ I ...
12
votes
1answer
248 views

MapIndexed and Compile

I am having trouble compiling a function that uses the MapIndexed function on the second level. The compilation runs fine, but at evaluation time I get an error ...
5
votes
4answers
151 views

How do I emulate DiscreteUniformDistribution in Mathematica?

How do I define a function from scratch that emulates DiscreteUniformDistribution? As shown below, attempting to use ...
11
votes
4answers
426 views

BSplineFunction derivatives wrong if using weights?

In my work, I make heavy use of non-uniform rational B-spline (NURBS) functions, defined using the function BSplineFunction[] with the option defining ...