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.
21
votes
0answers
385 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 ...
10
votes
0answers
136 views
Quiet doesn't work with FindRoot when using Brent method
The following has no solution:
FindRoot[x == 1, {x, 0.25, 0, 0.5}]
And Mathematica correctly warns us:
FindRoot::reged: The point {0.5} is at the edge of the ...
10
votes
0answers
127 views
func::usage needs to be run twice?
There is an annoying problem that I can't figure out why it's happening. I have defined a usage for a my function tensorA:
...
8
votes
0answers
123 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)
...
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 ...
8
votes
0answers
114 views
HorizontalGauge causes problem with ScalingFunctions -> “Log”
I am trying to use HorizontalGauge[Dynamic[expt], {0.1, 100}, ScalingFunctions -> "Log"], i.e. a gauge with a logarithmic scale. This creates an error, a graph ...
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 ...
7
votes
0answers
110 views
PlotMarkers doesn't inherit PlotStyle when Graphics[a] isn't a List[]
Could somebody explain, why Circle does not inherit the PlotStyle of the plot when used as ...
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 ...
6
votes
0answers
111 views
Break[] inside ColorFunction
f[x_?NumericQ]:= (Do[Break[],{i,1,2}];x)
Plot[x,{x,0,1},ColorFunction->(ColorData["Rainbow"][f[#]]&)]
Break::nofwd: No enclosing For, While, or Do found ...
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 ...
5
votes
0answers
160 views
Integral with HeavisideTheta takes too long to evaluate
I tried to compute $$\int_{-1}^1 d x_1 \int_{-1}^1 d x_2 \int_{-1}^1 d y_1 \int_{-1}^1 d y_2 \theta(x_1 x_2 + y_1 y_2)\,$$ where $\theta$ is Heaviside's step function, by using
...
4
votes
0answers
115 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 ...
4
votes
0answers
118 views
FinancialData property value at a given date
I was trying to get the volatility value of a specific equity on a given day.
Based on the Mathematica Help, the syntax is
...
4
votes
0answers
164 views
Incompleteness of FindInstance
I've been playing around with Resolve and FindInstance. I know that Resolve should always ...
4
votes
0answers
155 views
NullSpace[_, Method->“OneStepRowReduction”] is sometimes wrong; how can I work out when this happens?
(This is on MMA 7.0.1.0 on OS X)
I've just found a large matrix m for which NullSpace[m] and ...
3
votes
0answers
124 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 ...
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 ...
3
votes
0answers
75 views
An recurrence equation that can be solved in version 7 but not in version 8
A friend of mine showed me this code sample:
RSolve[{a[n] == a[n - 5] + 1, Sequence @@ Table[a[i] == 1, {i, 5}]}, a[n], n] // Timing
It's solved by version 7 in ...
3
votes
0answers
144 views
Unexpected behavior of GeometricTransformation
I have the following mapping on the complex plane:
$$
z \mapsto \tau \mu z-1,
$$
where $\mu$ is complex, $\tau$ is real number. I want to draw the image of left unit semidisk and play with $\tau$.
...
2
votes
0answers
89 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 ...
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,
...
2
votes
0answers
284 views
Simple contour integral with a parameter gone wrong
I run into the following problem, I tried to evaluate a very simple integral:
Assuming[ a > 0 , Integrate[Sin[a*s]/(s - I)^2, {s, -Infinity, Infinity}]]
...
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 ...
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:
...
