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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36
votes
6answers
2k views

ColorData[“VisibleSpectrum”] is wrong?

I am trying to visualize the visible spectrum using the built-in ColorData["VisibleSpectrum"] function which "colors based on light wavelength in nanometers". But I ...
35
votes
1answer
1k views

Transferring a large amount of data in parallel calculations

This question is inspired by one of @whuber's answers Consider the following code: ...
32
votes
2answers
827 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 ...
32
votes
2answers
762 views

String-manipulation bugs in v10.1

Fixed as of 2015-04-06 via paclet update. The new version 10.1 has introduced some strange (possibly buggy) behaviour compared to v10.0: ...
32
votes
2answers
1k 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 ...
31
votes
2answers
2k views

Mathematica 10 Notebook Fonts Look Bad

Bug introduced in 10.0.0 and persisting through 10.1.0 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 ...
29
votes
2answers
958 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 ...
29
votes
3answers
1k 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 ...
29
votes
1answer
763 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 ...
28
votes
2answers
875 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 ...
27
votes
3answers
420 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. ...
27
votes
1answer
387 views

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

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 all returns unevaluated! I am hoping ...
27
votes
0answers
526 views

Version 10 cannot print properly?

Bug introduced in 10.0 and persisting through 10.2 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 ...
26
votes
2answers
1k 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 ...
25
votes
3answers
918 views

Error changing Dataset using Part

bug present as of 10.1.0 bug present as of 10.0.2 In the new guide Computation With Structured Datasets we can find this part, on how to change a Dataset But if we create a ...
25
votes
2answers
2k 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 ...
25
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: ...
25
votes
3answers
688 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 ...
25
votes
2answers
737 views

Template completion

In version 8, if one evaluates test::usage="test[x,y]"; then types test, then shift-cmd-k (or shift-ctrl-k), a template ...
25
votes
2answers
325 views

Bug in ArcLength?

fixed in 10.1 (windows) With Mathematica 10.0.2: ArcLength[Line[{{0, 0}, {1, 0}, {2, 0}}]] ArcLength[Line[{{0}, {1}, {2}}]] (* 2 *) (* 2 *) However, ...
25
votes
1answer
272 views

Does Mathematica store hidden information for matrix objects?

Bug introduced in 10.0 and fixed in 10.2.0 I found a case where calling one built-in function (HermitianMatrixQ) for a given matrix changes the behavior of ...
24
votes
1answer
807 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: ...
23
votes
1answer
285 views

StringCases is Confused with Patterns in Version 10.0.1

I observed the following with StringCases when trying to use rules/patterns. Here is a screenshot of the behavior: Not only is the pattern highlighted in red, ...
22
votes
2answers
569 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. ...
22
votes
1answer
600 views

Unintended edge extensions in 3D Cube rendering

Bug introduced in 7.0.1 or earlier -- persists through 10.0.1 or later I have arranged a certain configuration of cubes in 3D using the following code: ...
22
votes
1answer
457 views

Why does list assignment with a packed array result in unpacked values?

Bug introduced in 5.2 or earlier and fixed in 10.1.0 This is another question on the design choices in Mathematica. I understand that without direct reply from the developers it may not be ...
21
votes
4answers
881 views

An apparently “simple” limit?

Let $c$ and $h$ be real values. I was using Mathematica to compute the limit $(h \rightarrow \infty)$ of the following expression: $$ \frac{\left(h^2 +c^2 h^2 + \sqrt{4 h^2+\left(h^2+c^2 ...
21
votes
2answers
507 views

Graphics elements do not line up perfectly in exported PDFs

Graphics elements do not always line up perfectly in exported PDFs using "Save As..." method. Take, for example: ...
21
votes
2answers
325 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 ...
21
votes
1answer
527 views

Excessive memory use by Mathematica kernel in 10.0.2 after executing simple commands

Update: The issue has been fixed in Mathematica 10.1! :) Warning: the code below may hang your system if you have the Suggestions Bar enabled in Mathematica < 10.1. When issuing the ...
21
votes
1answer
690 views

Kernel crash after idle in version 10.0

Bug introduced in 10.0.0 and fixed in 10.0.2 In version 10.0, when I leave the Mathematica section idle for some time (of order an hour), the kernel quit automatically. The syntax highlighting is ...
21
votes
1answer
305 views

Performance regression for Fold?

Bug introduced in 8.0 and persisting through 10.1.0 or later I noticed an over 10x performance drop on Mathematica v9.0.1 (as Oleksandr R. commented, also v8) compared with v7.01 for this code: ...
21
votes
1answer
807 views

Bug in Solve (Mathematica 9)

The issue seems to be fixed as of Version 10.1. Just came across the strangest bug under both Mathematica 9.0.0 and 9.0.1. If one enters: ...
20
votes
3answers
793 views

How accurate is GeoDistance?

Two years ago I tried an evaluation copy of Mathematica. I reported various inaccuracies in the GeoDistance routine to which I never received any fix. Could ...
20
votes
2answers
1k views

Why does Mathematica give the wrong answer when integrating?

I integrate Integrate[Exp[I Cos[b - c]] Cos[b], {b, 0, 2 Pi}] Mathematica gives: 2 I Pi BesselJ[1, 1] Which is indepedent ...
20
votes
3answers
377 views

Negative probability?

Bug introduced in 9.0.1 and fixed in 10.0.2 I am trying to get the sum of the squares of seven random variables, all uniformly distributed. This is what I tried. ...
20
votes
2answers
236 views

BitShiftRight produces incorrect results in Version 10

fixed in 10.0.2 With Mathematica 10 for Mac, BitShiftRight works properly on lists of up to 100000 numbers, but appears to give incorrect results when threaded ...
20
votes
2answers
294 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 ...
20
votes
1answer
794 views

Mathematica 10.1.0.0 (OS X) high CPU usage even for empty notebook

Bug fixed in 10.1.0 (see answer for details) Since update to 10.1.0.0 Mathematica has a high CPU usage even when no evaluation is running (even for empty notebook opened). I am running OS X ...
20
votes
0answers
448 views

Input Aliases in Mathematica 10

Bug introduced in 10.0.0 and persisting through 10.2.0 or later In Mathematica 9, typing in an input alias such as intt would result in the keyboard cursor ...
19
votes
2answers
577 views

Why is TextString[-0.5] a positive number?

Bug introduced in 10.0 and fixed in 10.0.2 I want to format numbers in decimal notation and chose TextString for this task. But today, when looking at the final ...
19
votes
1answer
506 views

Incorrect result from Integrate

I attempted to calculate the following integral: ...
19
votes
2answers
540 views

Have I found a bug in Integrate?

The following command gives 0 in Mathematica 9.0.1. ...
19
votes
0answers
318 views

A documented syntax of FileNames doesn't work?

Documentation discrepancy present through 10.2 According to the documentation for FileNames under Details: However when I attempt to use this syntax I get an ...
18
votes
3answers
606 views

Memory Leak in Frontend - anyone know a workaround?

When using Rasterize on a Graphics expression composed of many differently coloured Graphics objects memory is allocated in the frontend which is then not released or reused when a similar graphic ...
18
votes
2answers
236 views

Dataset seems to break Information

Bug present in version 10.2 My little function, from pre-10.2 ,to turn a headed table into a Dataset. ...
18
votes
4answers
824 views

A bug in Integrate

Integrate[(1 + 16 Tan[2 x - y]^2)/(1 + 4 Tan[2 x - y]^2), {x, 0, 2 π}] Mathematica (wrong) output is (tested under versions 8 and 10.0, took ~ 1 minute of CPU ...
18
votes
1answer
676 views

When importing GIF animation, how to find the correct list of “DisplayDurations”?

When importing GIF animations with variable frame durations, the settings for "DisplayDurations" are not recovered correctly. As an example, I'm using the movie from this earlier question: Here I'm ...
18
votes
1answer
245 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 ...
18
votes
1answer
178 views

Systemic bugs in GraphPlot and related functions such as TreePlot and TreeForm

Bug introduced in 7.0.1 or earlier and persisting through 10.2.0 I believe I have come across a rather curious bug in TreeForm: ...