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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9
votes
3answers
332 views

The numerics of FresnelS[]

Bug introduced in 12.1 or earlier and persisting through 12.1.1 or later [CASE:4615361] Note: A worse problem existed in 12.0 for inputs greater than 8 and of ...
0
votes
1answer
80 views

Is financial visualization broken? Can you run any of these examples or InteractiveTradingChart[] at all?

I can't run anything relevant to financial visualization in my mathematica installation, i found these interesting example but anything that use the trading chart is kind of broken. EDIT: I'll add a ...
0
votes
0answers
29 views

Mathematica fails to load welcome screen: “Authentication Required”

Problem When I open Mathematica 12.1.0 on windows 10, I get an "Authentication Required" window during the splash screen. The auth window has no input or buttons, and the text in the window ...
14
votes
4answers
654 views

FEM: Why are the numerical solutions of field equations with D and Inactive[Div] and Inactive[Grad] different?

Suppose you have the DE $$ \frac{d}{dx} \left( c(x) \left[\frac{d}{dx}u(x)\right] \right) + n(x) = 0 $$ and you want to solve for $u(x)$ with some BCs with given $c(x)$ and $n(x)$. I thought that ...
2
votes
0answers
34 views

`SumConvergence` gives different results for two equivalent series

Bug persisting through v12.0.0.0 and resolved in v12.1.0.0 Consider these two sequences: a = 2^n/(n! Gamma[(1 - n)/2]^2); b = Simplify[a /. n -> 2 m] It turns ...
3
votes
2answers
92 views

How to display full 3D region?

Answers to an earlier posting, ConvexHullMesh inconsistency, have let me construct a particular 3D region by intersecting a pyramid with a halfspace: ...
5
votes
1answer
92 views

ConvexHullMesh inconsistency

I am seeing an inconsistency in ConvexHullMesh that I don't understand. Here is Rhull = ConvexHullMesh[pts8] where the $8$ ...
4
votes
1answer
70 views

Strange behaviour in ToElementMesh

Why would that not work: ...
8
votes
1answer
125 views

Problem with Binomial numerical computation

Using Mathematica 10.4.1.0 I have a problem with Binomial on numerical computations. For example Binomial[2, 1/5] // N correctly returns ...
9
votes
1answer
134 views

Peculiar behaviour in the implementation of “Filling”

I was working with mathematica and I need to use "Filling", however I notice that it doesn't work when you have "small" numbers, for example if I make the following: ...
4
votes
1answer
60 views

Why doesn't RulePlot understand the TuringMachine in the documentation?

The documentation for TuringMachine gives the following example of a machine specified by explicit transitions: ...
17
votes
2answers
771 views

Version 12.1.1 unable to type “>”

Bug introduced in 12.1.1 Since I upgraded to version 12.1.1 I am unable to use > (Shift+.). When I type Shift+. the cell that I am typing in converts to Python. What am I doing wrong? Steps to ...
1
vote
0answers
84 views

FindMaximum does not use requested WorkingPrecision

I think that there is a bug in the way FindMaximum handles WorkingPrecision for constrained problems. Has anyone encountered a similar problem before? Is there a work around? Here is an example in ...
4
votes
0answers
112 views

Probem of Classify's Tree Method in Batch Predict

$Version 12.1.0 for Microsoft Windows (64-bit) (March 14, 2020) ...
16
votes
7answers
579 views

Missing solution - system of equations

Attention! This example already works as expected in Wolfram Mathematica 12.1.1.0 for function Solve. The problem was in version 12.1.0.0. Check out answer of Bob ...
3
votes
0answers
27 views

Importing notebooks with definitions that cause messages during formatting

According to reference pages, Quiet "does not quiet messages that occur during formatting", which typically is just a nuisance, but it seems to affect ...
9
votes
3answers
223 views

Multiplying two complex SparseArray objects, yielding empty SparseArray crashes kernel

Problem: When I multiply together two sparse matrices that should give back the 0 matrix, where at least one element among the two is complex and at least one is not an exact number, the kernel ...
3
votes
0answers
66 views

PowerModList anomaly

This post is related to Not comprehending PowerMod. Here the issue is that PowerModList, in v. 12.1 finds no cube roots of 1 Mod 10^60 - 1: ...
2
votes
2answers
67 views

RegionBounds wrong with small change

For the following: RegionBounds[ImplicitRegion[0 <= y <= Sqrt[1 - x^2], {x, y}]] I get the correct value of ...
5
votes
3answers
319 views

DSolve fails to handle summation involving DiracDelta

Executing s = DSolve[{y''[x] + y[x]==Sum[DiracDelta[x-2^n]/2^n,{n,0,Infinity}],y[-Pi/2]==-1,y'[-Pi/2]== 0}, y[x], x] , I obtained ...
0
votes
0answers
41 views

RegionDistance and SignedRegionDistance do not work with Polyhedron objects

I have reported this behaviour to WRI. A support case was created with the ID [CASE:4544288] Consider this simple example (tested in Mathematica 12.0 and 12.1): ...
4
votes
0answers
52 views

How do I permanently remove the Wolfram Desktop folder? [duplicate]

Wolfram Desktop creates a "Wolfram Desktop" folder in my Documents folder on macOS, in violation of Apple's guidelines. I can delete it but it keeps coming back each time I launch Desktop. How do I ...
7
votes
0answers
163 views

Two integrals that should not be equal

Bug introduced in 12.0 or earlier and persisting through 12.1.0 CASE:4539809 I think there is a bug here: ...
10
votes
0answers
194 views

Why is Product[1 + 1/k^5, {k, 1, Infinity}] equal to zero in 12.1?

In all versions up to 12.0 it is ...
0
votes
0answers
27 views

SemanticImport not importing new data [duplicate]

I have a script that uses SemanticImport to import CSV content from an internet URL. When I run the same script the following day, the resulting data is not updated....
5
votes
3answers
132 views

RegionUnion Fails for Overlapping 3D Regions

Bug introduced in 12.0 or earlier and persisting through 12.1.0 Warning: The below code may crash your kernel! I am trying to make a (simple) 3D mesh of a box for a FEM solution (I am using MMA 12.1 ...
4
votes
0answers
78 views

Export Latin Modern Math Greek: spurious spacing on Windows

Bug introduced in 12.0.0 or earlier on Windows [CASE:4549185] To get simple LaTeX Greek in my figures, I am using U+1D6FC MATHEMATICAL ITALIC SMALL ALPHA to ...
15
votes
1answer
318 views

Wrong function of NotebookDirectory[] in the 12.1 version

Bug introduced in 12.1.0 Could anybody help? NotebookDirectory[] function began working wrong in 12.1 (the bug was not present in 12.0 and earlier versions). ...
5
votes
1answer
101 views

Discrepancy between the results of NDSolve and DSolve (equations related to one step processes)

Bug introduced in 12.0 and fixed in 12.1 The following are the dimensionless equations of a one-step random walk with an "impure" reflecting boundary assuming only four possible states, i.e., n=0, 1, ...
6
votes
1answer
75 views

Possible bugs in NetTrain? The loss of validation set shouldn't be lower than that of training set

I'm very curious why the loss of validation set is even lower than the loss of training set when I use NetTrain. Say, on this page, https://reference.wolfram.com/language/tutorial/...
7
votes
2answers
163 views

DEigensystem gives x-dependent eigenvalues

Bug introduced in Version 11 or earlier and persisting through 12.1. Reported to Wolfram Technical Support as CASE:4532301. I am considering the eigenvalue problem associated with the double-well ...
12
votes
0answers
187 views

Internal error using part specification with Dataset

Bug introduced in 12.1.0. Fixed in 12.1.1 Update 2020-04-13 WRI has confirmed that this is a bug. CASE:4530401 Suggested workaround from WRI ...
5
votes
0answers
56 views

Can't seem to match multiple KeyValuePatterns in one pattern

Let's define a couple patterns that we can use to match Associations. ...
2
votes
0answers
115 views

GraphData does not work in the cloud [closed]

Bug introduced in 12.1 cloud Currently, GraphData does not seem to work in the cloud. For example, GraphData["TutteGraph"], <...
4
votes
0answers
67 views

DateInterval Min/Max performance issue

Bug introduced in 12.1 and persisting through 12.1.1 Update WRI has confirmed that this is a bug. CASE:4521676 The performance of Min and ...
9
votes
0answers
151 views

Dividing by Zero - Unexpected Result [closed]

When I divide this number by zero I get this for an answer. ans = 2345900/0 (* *) What is surprising is that in taking the square root, Mathematica seems to ...
2
votes
1answer
67 views

Problem importing a pdf with a character with increasing opacity

I want to import a pdf in MMA(ver 12.0). The pdf is here. This pdf has a "$c^2$" in the middle of the white square that is completely transparent in the first page, then it become progressively more ...
4
votes
0answers
68 views

HatchFilling becomes gray for small aspect ratio Rectangles

I am trying to use the new to version 12.1 graphics directive HatchFilling. Here is an example: ...
4
votes
0answers
57 views

Does AroundReplace work with Quantity?

When I try to use AroundReplace with units it issues Around::compat message and outputs something strange: ...
1
vote
1answer
41 views

SemanticImport returning different data versus Import [duplicate]

I'm analyzing data for Covid-19 and found an interesting website: "https://covidtracking.com/api/states/daily.csv". My problem: using SemanticImport, it seems stuck on the data that I read yesterday ...
6
votes
0answers
256 views

Plotting severely distorted in V12.1 but works in V12

The following code can plot a surface in 3D (the plot) and also makes a row of two plots using ...
0
votes
0answers
57 views

Unknown Box Name (ToBoxes) Error

I'm getting the following error in Mathematica What is going on? How do I avoid such an error? In order to roughly understand how I'm getting this error, here is a bit of context: I'm using ...
3
votes
3answers
132 views

Incorrect limit in complex quantity

I have the following quantity $$ f = \frac{\exp(\sqrt{-k^2-i\epsilon}d)}{\sqrt{-k^2-i\epsilon}} $$ and form the limit as $\epsilon\to0$. Mathematica does not produce the correct result. Code: <...
2
votes
1answer
77 views

Why does PageBreakAbove / PageBreakBelow not work here?

Bug introduced in 12.0 or earlier and persisting through 12.1 Create a notebook having interspersed cells of figures and text: ...
13
votes
1answer
375 views

VideoPlay crashes the Kernel with Mathematica 12.1

I'm using Mathematica 12.1 on windows 10 (Microsoft Windows [Version 10.0.16299.1686]) When going to the Help file about VideoPlay I tried the standard example and it crashes the Kernel. For me it'...
4
votes
1answer
185 views

SemanticImport vs Import differ on same CSV file?

Using WL 12.1.0. Is SemanticImport caching data somewhere? I did this SemanticImport for the first time, yesterday. Worked fine. ...
9
votes
2answers
230 views

FEM Mesh related errors

Bug introduced in 12.0. Fixed in 12.1.0. I try to solve the simple heat transfer equation but there are some errors at the stage of the pre-processing. ...
3
votes
2answers
156 views

Bug in WebExecute TypeElement with diacritics characters [Solved]

[Solved in 12.1.1] When using WebExecute TypeElement, I get $Failed if I have a diacritics ...
9
votes
2answers
261 views

Unexpected 'switch' of partial derivatives when differentiating InterpolatingFunction

Bug introduced in 11.3 or earlier and persisting through 12.1.0 or later - Fixed in Version: 12.1.1 In short, there is a simple initial boundary-value problem for which NDSolveValue produces an ...
5
votes
1answer
227 views

Why do the Integrate and NIntegrate give different results?

Bug introduced in 12.0 or earlier and persisting through 12.0.0 or later I'm using Mathematica to calculate the following integral, but I don't know why the result of using ...

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