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.
2
votes
0answers
93 views
Why my Mathematica 9.0.1 wont work with some samples of Mathematica in Graph Theory?
I updated my Mathematica recently to 9.0.1 cause the previous version was giving me freaky result especially in FindMinimumCostFlow and ...
4
votes
2answers
106 views
Why is this parallel evaluation with Dispatch[] so slow?
Can you efficiently parallelize this? The parallel versions are much slower than the sequential version, and I'm not sure why. Does SetSharedVariable allow ...
18
votes
1answer
373 views
Transferring a large amount of data in parallel calculations
This question is inspired by one of @whuber's answers
Consider the following code:
...
7
votes
1answer
285 views
FourierSeries for rational function looks wrong
I have the following code:
ser[x_] = FourierSeries[(\[Pi]^2 + a)/(3 x^2 + a), x, 10] // N // Chop
It gives me some series, which I then try to plot. And ...
24
votes
2answers
415 views
Variable naming changes everything
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 example of the code ...
5
votes
1answer
61 views
Importing images from the web using ImportString & URLFetch
I can bring images from the web using the Import command like this:
Import["http://blog.wolfram.com/wp-content/uploads/2008/06/se-30.jpg"]
Sometimes the web ...
7
votes
0answers
83 views
Compile not correctly initializing a variable defined inside Module
In the following example, inside the minimumX's Module, x is initialized to 1, but the ...
10
votes
1answer
218 views
Why can't I change the value of MaxRecursion in NIntegrate when integrating BesselJ?
I am trying to evaluate this integral numerically
$$
\int_0^{\infty } J_0(q R) \tanh(q) \, \mathrm{d}q
$$
for large values of $R$. This makes the integrand oscillate more quickly and Mathematica ...
5
votes
4answers
139 views
4
votes
1answer
89 views
RSolve gives a Context::ssle error
I want to solve the following recurrence equation
RSolve[{(k + 2) c[k + 2] q^(k + 1) - c[k] == 0}, c[k], k]
During calculation in Mathematica I get this ...
6
votes
1answer
63 views
5
votes
1answer
103 views
Error invoking Information on functions containing Legended
In adapting some plotting functions to utilize the PlotLegends option of version 9, I came across the following errors:
...
4
votes
2answers
113 views
Strange behavior of Integrate
I'm trying to calculate the following integral using Mathematica 9.0.1.0
a11=Integrate[Abs[Sin[b+x]],{x,0,2*\[Pi]}]
This should be a simple problem; however, it ...
5
votes
1answer
174 views
LogPlot axes labels destroyed when working in high precision
(I'm using Mathematica 8.)
I have a Taylor series:
poly = Normal[Series[E^x, {x, 0, 10}]]
I want to produce a log-linear plot of the error. This is easy enough ...
5
votes
2answers
124 views
Is there something wrong with VertexConnectivity
As I noticed in the documentation VertexConnectivity is defined as the following
The vertex connectivity of a graph $g$ is the smallest number of vertices whose ...
0
votes
0answers
86 views
Problem when merging cells including commentary
This is a more of a problem report than a question.
When merging the two cells
Cell1:
foo
(*foobar*)
bar
and Cell2:
...
8
votes
2answers
134 views
Problem with NIntegrate when WorkingPrecision is specified
I am trying to evaluate this integral numerically:
$$
\int_0^{\infty } m \exp (-m) J_1(m){}^2 \, dm
$$
Everything is OK when only the integration method is specified:
...
4
votes
0answers
164 views
Incompleteness of FindInstance
I've been playing around with Resolve and FindInstance. I know that Resolve should always ...
2
votes
0answers
89 views
Derivatives of list elements
Could someone explain the odd behavior of the Derivative function when drawing arguments from lists? We have,
...
5
votes
0answers
77 views
Compiled function crashes kernel when trying to list over different length arguments
I'm trying to speed up a tally/binning operation that I have to run many times.
I have many lists of between 1 and 10 numbers from the range [1,5] and I want to ...
8
votes
0answers
125 views
Why does Mathematica give an incorrect answer to this multiple integral?
This is not a new problem but I would like to understand why Mathematica gives the result that it does. (Volume of a hypersphere)
...
11
votes
1answer
115 views
Upon PDF export, edgeless rectangles do not tile perfectly, and corners may be cut. Is this a bug?
Exporting the following as a PDF file
Graphics[{
{Red, Rectangle[{0, 0}, {1, 1}]},
{Green, Rectangle[{1, 0}, {2, 1}]}
}]
does not produce perfectly tiled ...
7
votes
1answer
71 views
ToNumberField won't recognize Root[…] as explicit algebraic number
In Mathematica 9.0.1, it appears that ToNumberField will not always recognize a Root object as an explicit algebraic number.
...
3
votes
0answers
125 views
Cannot save file
Hello I have a problem in saving files in Mathematica. I can't save not only notebooks but also figures. When I choose to save the notebook it open a window that says:
Mathematica could not find ...
10
votes
2answers
220 views
4
votes
0answers
116 views
Strange result from evaluating a Limit expression
When I evaluate the limit of (1-Cos[x]) Sin[1/x] at x = 0 in Mathematica 9, I obtained ...
8
votes
0answers
101 views
Help bogged down at first query
When I open help at the first time in a mathematica session and I submit a query it always get bogged down for many seconds until a message appears as in the picture. Then I select continue waiting, I ...
27
votes
3answers
385 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 ...
14
votes
1answer
214 views
Why does LogLinearPlot sample its argument outside the specified domain?
I experience a weird bug in the function LogLinearPlot. If the input is an interpolation function, such as the one created like this,
...
7
votes
1answer
69 views
Crash with subsetting TemporalData
The first line gets a single sample path for an M/M/1 queue for time between 0 and 100. No problem, I can plot it, etc.
...
13
votes
1answer
395 views
Unique[] symbol not properly tracked
In a nutshell, why does this work (change y and see how the value updates)
...
2
votes
1answer
147 views
Misaligned DensityHistogram, DistributionAxes & PlotRange
data = RandomReal[NormalDistribution[0.5, 0.1], {10000, 2}];
DensityHistogram[data, PlotRange -> 1, Method -> {"DistributionAxes" -> "Histogram"}]
The ...
11
votes
1answer
456 views
How to work around Mathematica hanging when showing a large SparseArray?
Note: This is fixed in 9.0.1.
In Mathematica 9, if I display any large SparseArray object in the default way (which looks something like ...
9
votes
2answers
134 views
SaveDefinitions->True changes the displayed image
I have a Manipulate[ ] that displays an image with a superimposed Locator object. It works fine when I have ...
3
votes
1answer
99 views
Something wrong with RectangleChart and Tooltip?
Currently I'm working on a diagram showing the merit order of power plants in the Netherlands. On the horizontal axes you see the cumulative power and on the vertical axes you see the costs per MWh. ...
6
votes
0answers
68 views
Mathematica 7: “LessEqual::nord:” error when using NMinimize on a real function
I encounter a problem (Mathematica 7) similar to Strategies to avoid LessEqual::nord in NMinimize? but the advised strategies don't work for me. Also, I get different results with different ...
3
votes
2answers
49 views
CommunityGraphPlot doesn't size
When I need to plot a 'large' graph with CommunityGraphPlot the output is always sized at the Mathematica default value. The Graph object itself can be resized with ImageSize option. However that ...
7
votes
3answers
247 views
Radon function result's repeatability
I want to get a Hough transform of some edged image.
When I compare the same transformation on the same image I got different results.
...
18
votes
2answers
755 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 ...
3
votes
1answer
136 views
BarChart and Log Scale results in different bar origins
I want to create a bar chart from two different data sets.
...
2
votes
2answers
173 views
Weird NDSolve behavior with Piecewise (MMA9)
NDSolve in Mathematica 9.0.0 (MacOS) is behaving strangely with a piecewise right hand side. The following code (a simplified version of my real problem):
...
5
votes
2answers
283 views
Exporting a .xlsx file with about 500 columns
When I want to Export["text.xlsx", data] where data is a matrix with 500 columns and 10000 rows, I get the error message:
...
2
votes
3answers
147 views
ParametricPlot and PlotLegends don't seem to cooperate
I noted that only part of the legend shows up in ParametricPlot using v9's PlotLegends:
...
1
vote
0answers
143 views
Is this a bug in ListPicker?
I use Mathematica v9.0.1 Home Edition. I recently modified some code to take advantage of the ListPicker Manipulate control (new ...
3
votes
1answer
127 views
Sum of positive terms gives negative answer
Mathematica evaluates Sum[((n - y - 1)*(n - y)^2*n^y)/y!, {y, 0, n - 2}] as -2 e^n n. This should not be a negative value. ...
6
votes
2answers
169 views
Why doesn't my script work when I redirect stdout?
I'm using Mathematica Home Edition 9.0.1 on Mac OS X 10.8.2.
I have this script:
...
9
votes
3answers
153 views
“Stacked” BarChart with BarOrigin $\to$ Top makes y-tick marks negative
When BarChart layout is "Stacked", setting BarOrigin -> Top makes the y-axis tick marks ...
20
votes
2answers
519 views
Strange ::usage behavior in v9
Note: This is 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 ...
3
votes
0answers
79 views
Unexpected result when reading Cell with comment-lines by NotebookRead
When considering this question about re-formatting Cell (also this one), I encountered an issue which confuses me. I'll let the code itself speak:
Consider the ...
10
votes
1answer
112 views
FindInstance returns Indeterminate in version 9, but not in 8
Here is a trivial system of equations in three unknowns for which FindInstance obtains a solution:
...
