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Questions tagged [bugs]

This tag is reserved for questions where the problem has been vetted by this community and the observed behavior is confirmed to be a bug. Please do not use this tag for new questions. Please use the standard bugs header instead of version tags in conjunction with this tag.

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78
votes
2answers
20k views

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 ...
47
votes
6answers
5k views

ColorData[“VisibleSpectrum”] is wrong?

Bug introduced in 10.0 or earlier and fixed in 11.1 I am trying to visualize the visible spectrum using the built-in ColorData["VisibleSpectrum"] function which "...
45
votes
1answer
2k views

Transferring a large amount of data in parallel calculations

Bug fixed in version 11.1 Functions like MemberQ, FreeQ, etc. no longer unpack. Yay! This question is inspired by one of @...
45
votes
0answers
778 views

Hyperlinks not preserved when saving in PDF format in MMA V10

Bug introduced in 10.0 or earlier and fixed in 11.0.0 I usually create my course contracts in Mathematica and then save them in PDF format. The notebooks include hyperlinks and these have ...
44
votes
2answers
1k views

Input Aliases in Mathematica 10

Bug introduced in 10.0.0 and persisting through 11.1.1 or later In Mathematica 9, typing in an input alias such as intt would result in the keyboard cursor ...
43
votes
2answers
1k views

Why does Mathematica report that $\int_1^\infty\frac{\sin(\sqrt{x})}{\sqrt{x}}dx$ = $2\cos(1)$?

Bug introduced in 7.0 or earlier and fixed in 11.0 Mathematica 10 gives the following very odd result, Integrate[Sin[Sqrt[x]]/Sqrt[x], {x, 1, ∞}] (* 2 Cos[1] *) ...
39
votes
7answers
1k views

How symbol lookup actually works

Bug introduced in V6 and fixed in V11.3 The behavior indeed changed but now the documentation is clear about it. This code is inconsistent with the description from Power Programming with ...
39
votes
4answers
1k views

Some indefinite integrals evaluate in 11.2 but not in 11.3 - what can be done?

Bug introduced in 11.3 and fixed in 12.0.0 Reported to Wolfram: [CASE:4032137] These integrals evaluate in version 11.2 on windows but when I tried them under version 11.3 they returned unevaluated.,...
39
votes
2answers
2k views

Variable naming changes everything

Bug fixed in 10.0.0 I am having a rather unusual problem I do not understand with Mathematica where renaming one of the variables of my function causes the function to stop "working". Here is the ...
38
votes
4answers
2k views

Error changing Dataset using Part

Update It was a bug in the documentation of V10.0, this functionality was not implemented yet, and V10.1 changed the documentation, removing it. It's a pity, because it's a very useful operations, ...
38
votes
3answers
3k views

Mathematica 10 Notebook Fonts Look Bad

Bug introduced in 10.0.0 and persisting through 10.3.0 or later I've upgraded my home installation of Mathematica from version 9 to 10 today on a Windows 8.1 machine, and I'm getting a weird font ...
37
votes
4answers
941 views

What is the difference between Dynamic[x] and Dynamic[ h[x] ] for DynamicModule variables?

Bug introduced in 9.0 or earlier and persisting through 12.0 In 11.3 it is even worse. An example from the accepted answer with a Slider is now broken too: ...
37
votes
2answers
2k views

eigenvector bug?

Bug introduced in 7.0.1 or earlier and fixed in 10.0.0 I have a fairly simple $3\times3$ complex matrix, $$ M=\left( \begin{array}{ccc} \frac{7}{2}-\frac{i}{2} & -1+i & \frac{1}{2}+\frac{5 i}...
37
votes
1answer
683 views

Parallelize Map and ParallelMap

Bug introduced in 8.0 and fixed in 11.2 It is stated in the documentation that Parallelize[Map[f, expr]] is equivalent to ...
37
votes
2answers
832 views

$\sum_{k=1}^{\infty }\left\lfloor\frac{5}{5^k}\right\rfloor$ giving wrong answer?

Bug introduced in 7.0 or earlier and fixed in 11.0.1 When I try to evaluate the following: $$\sum_{k=1}^{\infty }\Bigg\lfloor\frac{5}{5^k}\Bigg\rfloor$$ using ...
36
votes
2answers
935 views

Eigenvalues broken in Version 12.0

Bug introduced in 12.0. The following code calculates the eigenvalues of a certain complex matrix, which come in pairs of opposite complex numbers. Therefore one can check whether the sum of all ...
36
votes
2answers
911 views

String-manipulation bugs in v10.1

Introduced in 10.1, fixed in 10.2; fixed via paclet update in 10.1. The new version 10.1 has introduced some strange (possibly buggy) behaviour compared to v10.0: ...
35
votes
2answers
4k views

Debugging memory leaks

I've written my incredibly complex, incredibly elegant analysis function, that works great on small test data. But when I run it on my real (bigger) data set it keeps running out of memory. It turns ...
35
votes
2answers
6k views

Mathematica stuck in “running” for every calculation I attempt, kernel error

Bug introduced in 11.1.1 and fixed in 11.1.1 Bug was caused by a paclet update and fixed by a paclet update. I downloaded Mathematica this morning to do an implicit polar plot. I attempt to run the ...
35
votes
1answer
548 views

Why is multidimensional Reverse slow?

Bug introduced in 6.0 or earlier and persisting through 11.1.1 or later I have found that multidimensional Reverse is ~10 times slower than exact ...
34
votes
2answers
731 views

GroupBy twice gives different results

Bug introduced in 7.0 or earlier and persisting through 11.1 It took me quite a lot of time to finally trace down to this strange output. I really don't know why. First, I create a list ...
34
votes
2answers
2k views

Bug in mathematica analytic integration?

I found Mathematica provides me a wrong answer for a relatively simple analytically solvable integral: ...
34
votes
3answers
2k views

No warning when extrapolating with Plot

One of the most annoying "features" of Mathematica is that the Plot family does extrapolation on InterpolatingFunctions without ...
34
votes
0answers
586 views

Front end goes wild with named slots

Bug introduced in 10 and persisting through 12.0.0 Assume the following simple expression {#"Test"}& Now go in front of the ...
33
votes
2answers
926 views

How do I disable the stack tracing feature in Mathematica 11?

Bug was introduced in 11.0 and persisting through 11.1 It looks like the Mathematica 11 stack tracing feature (see red ellipsis in front of any warning message) prevents the garbage collector from ...
33
votes
1answer
2k views

What is wrong with triangle PlotMarkers in v.10.0.0?

Bug introduced in 10.0.0 and fixed in 10.0.1 In Mathematica 10.0.0 we have built-in graphical triangle PlotMarkers. Let us look closer on them: ...
33
votes
1answer
1k views

Terrifying performance decrease for contour/density plots in v10.1 -> 10.3

Bug introduced in 10.3 and fixed in 10.3.1 I setup for download a test dataset at http://www.inrim.it/~magni/cm.dat.gz (a set of 64800 triplets x,y,z). The behavior can be reproduced with the ...
33
votes
1answer
1k views

Version 11 cannot print properly?

Bug introduced in 10.0 and persisting through 11.2 or later I have two problems with printing in version 10. First, I can't print correctly with a setting of printing scale For example, I have some ...
32
votes
2answers
949 views

Graphics elements do not line up perfectly in exported PDFs

Bug introduced in version 9.0 and persisting through 10.4 Graphics elements do not always line up perfectly in exported PDFs using "Save As..." method. Take, for example: ...
32
votes
2answers
2k views

Specifying non-conflicting PlotTheme options

A bug or limitation in 10.0.0 affects a few of these examples; it was resolved in 10.1.0. I am trying out Mathematica 10 on https://programming.wolframcloud.com. ...
32
votes
1answer
1k views

Complex eigenvalues from a sparse Hermitian matrix

Bug introduced in 9.0 or earlier and persisting through 12.0. I notice in the following example that wrong complex eigenvalues are resulted if calculating from a Hermitian sparse matrix, which should ...
32
votes
2answers
2k views

DeleteDuplicates not deleting duplicates

Bug introduced in 9.0 and fixed in 10.0.0 It is not surprising that DeleteDuplicates[{5,5.}] returns {5,5.} because ...
32
votes
1answer
873 views

What calendar is Mathematica using for dates in the distant past?

It appears that Mathematica treats all dates as proleptic Gregorian dates by default, a hypothesis that can be easily tested by using AbsoluteTime to compute the ...
30
votes
2answers
978 views

Huge bug involving MultinormalDistribution?

Bug introduced in 8.0 or earlier and fixed in 11.1 I found a strange behavior regarding the CDF of the bivariate Normal distribution ...
30
votes
2answers
1k views

Strange ::usage behavior in v9

Bug fixed in 9.0.1 Something has gone wrong with usage in Mathematica 9. Would someone tell me how to fix it? I define a function ...
30
votes
3answers
614 views

Is there an issue tracker for already reported Mathematica bugs?

Since I'm working at least 50% on Linux which is probably the operating system which gets not so much attention from Wolfram, I find new bugs regularly. What bothers me the most is, that tracking a ...
30
votes
3answers
2k views

Save as pdf broken in version 10.0.2?

Fixed in 10.1 It looks like the save as pdf is broken after I update to version 10.0.2. The labels in the plot become a mess. Are there ways to fix it? The Export ...
30
votes
0answers
576 views

Is MathieuC for moderately large imaginary arguments broken?

Bug introduced in 3.0 and persisting through 12.0 (reported as CASE:3208982) I'm trying to plot MathieuC[-3,0.3,I x] for $x\in[0,10]$, and here's what I get even ...
29
votes
3answers
2k views

Generating 250 random points crashes the kernel, but not 249

Fixed in 10.1.0. Consider the following function, which generates uniformly random points on the surface of the 2-sphere: ...
29
votes
3answers
544 views

Assign a randomly generated list to variable

Bug introduced in 10.0.0 and fixed in 10.0.2 I don't know if this is a silly question, but it really baffles me. So please help me understand this behavior. ...
29
votes
1answer
501 views

many indefinite integrals do not evaluate in 10.1, looking for the cause

Bug introduced in 10.1 and fixed in 10.2 Many integrals no longer evaluate in V 10.1 when they did in 10.0.2 Here are some 23 integrals as an example, that all produced results in V 10.0.2, but now ...
29
votes
1answer
379 views

How to speed up TextJustification in Mathematica 10

Based on this question: - Version 7 print environment - I set up two 10 page test documents in version 7.0.1 and version 10.1. The version 7 document exported to PDF in 4.18 seconds whereas the ...
28
votes
4answers
616 views

FullSimplify wrongly reduces expression to zero

Bug introduced in 9.0 and persisting through 11.0 I get the following output with a fresh Mathematica (ver 10.0.2.0 on Mac) session ...
28
votes
2answers
856 views

Default behaviour of Hash[expr] and hashing in different versions of Mathematica

In different versions of Mathematica, Wolfram silently changed the behaviour of Hash when the algorithm is not specified explicitly ...
28
votes
3answers
505 views

How can I restore the old ImageCompose behaviour?

Bug fixed in 11.3 Update This issue caught me out again so I contacted support once more. They have confirmed that the development team considers the new behaviour to be correct and claim that "...
28
votes
1answer
1k views

Unintended edge extensions in 3D Cube rendering

Bug introduced in 7.0.1 or earlier -- persists through 10.1.0 or later I have arranged a certain configuration of cubes in 3D using the following code: ...
28
votes
3answers
1k views

Symbolic integration error

fixed in 10.1 (windows) I'm running Mathematica 10.0.0 and encountered a disturbing error in the symbolic integration of a rather simple function ...
28
votes
0answers
370 views

Bug in RegionMember?

Bug introduced in 10.0 and persisting through 12.0 RegionMember is new in 10.0 A commenter notes that the issue is with ...
27
votes
1answer
650 views

In 10.1.0 BenchmarkPlot doesn't work?

Bug introduced in 10.1 This bug was resolved in 10.2.0, but another bug was introduced in 10.3.0 persisting through 10.3.1 and finally resolved in 10.4 In Mathematica 10.1.0 and 10.3.0 ...
27
votes
3answers
340 views

Count works differently depending on how an association was created

Bug introduced in 10.4 and fixed in 11.3.0 I create two associations, that are supposed to be exactly the same. And then I want to count the elements at the second level. And I get different results: ...