Tagged Questions

270 views

Negative probability?

I am trying to get the sum of the squares of seven random variables, all uniformly distributed. This is what I tried. ...
120 views

How to fix a PDF line rendering problem in V9

If I run this in V8 ...
185 views

Strange filling

I observed some strange behaviour when plotting a function with filling. The code is as follows: ...
231 views

Mathematica 9 cannot solve a difference equation that Mathematica 8 can

Consider RSolve[{a[n + 1] == 2 a[n] + n (1 + 2^n), a[1] == 1}, a[n], n] Mathematica 8 can solve this quickly, but Mathematica 9, even after being allowed to run ...
144 views

Why does Arrow not work well with Scaled coordinates in 3D?

I am a little puzzled by the fact that if I try to use Arrow with Scaled coordinates in 3 dimensions the arrowheads are all over ...
293 views

Don't understand why Mathematica is complaining about my Graph expression; how can I fix it?

In Mathematica 9.0.1, when I evaluate ...
79 views

My plot is cut off if a frametick is “0” but resized if a frametick is “0.” Why?

I have been trying to customize the frame ticks and frame label around a certain contour plot and am running into very strange behavior where the graphics will get cut off by ...
53 views

I evaluate ...
46 views

Addition of sparse array objects [duplicate]

I have been having some trouble with the addition of large (but very sparse) matrices using SparseArray. Here is the simplest example to illustrate the issue. First, I will define diagonal matrices ...
178 views

Problem with CurrentValue[“MouseOver”] when graphics are wrapped with Deploy

Please take a look at following toy example: ...
174 views

Sporadic bugs in multidimensional SparseArray objects

Udate This SparseArray[] bug is (apparently) fixed on version 10.0 ...
217 views

M9 performance regression for Fold?

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: ...
197 views

Cancellation of common terms

Can someone explain why the term A in case 2 does not get canceled out when case 1 does? I use "9.0 for Microsoft Windows (64-bit) (January 25, 2013)" ...
137 views

Issue with FindCurvePath

I have a problem with the function FindCurvePath. In some cases it crashes the Mathematica 9 Kernel. Here an example, where it crashes the kernel: ...
280 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: ...
92 views

Is there really a bug in the following code, taken from the reference documentation for PetersenGraph?

PetersenGraph[5, 2, EdgeLabels -> {8 \[UndirectedEdge] 9 -> "hello"}] appears to evaluate perfectly, as expected, but in my version 9.0.1.0, the option ...
72 views

Infix strange behaviour

Maybe this is a bug or maybe Infix acts differently than the other functions. The fact is that both: TreeForm[Infix[f[x, a]]] and ...
286 views

Kernel inexplicably hangs if I define a pure function without suppressing output

Save any unsaved work before trying as it may crash Mathematica and other programs by filling up the memory! In v9.0.1.0 on OSX 10.8.5, if I start a new session and define two functions ...
186 views

Wrong numerical value while exporting to a JSON string

The following code: ExportString[{"a" -> 2000000., "b" -> 0.000001}, "JSON"] Gives the results ...
74 views

Setting PropertyValue for VertexWeight is not persistent

g = CompleteGraph[8, VertexSize -> Medium]; PropertyValue[{g, VertexList[g][[1]]}, VertexWeight] = 10; PropertyValue[g, VertexWeight] ...
242 views

Deconvolution of Image3D object using ImageDeconvolve

I am trying to get the ImageDeconvolve function to work with Image3D objects. In the documentation of ImageDeconvolve it says: ...
116 views

ParametricNDSolve: Fails to differentiate an matrix differential equation

It seems like there is a problem with differentiating a ParametricNDSolve object when the underlying system contains an matrix differential equation. Create a simple ParametricNDSolveValue object ...
246 views

Possible bug with second argument of Dynamic

According to the documentation, Dynamic Details & Options section, especially: For interactive mouse operations Dynamic[expr,{f_start, f, f_end}] typically ...
260 views

Mathematica9: NDSolve slows down after repeated calls

I have noted that in Mathematica 9 my code, which involves a lot of calls to NDSolve, slows down considerably after some time. Apparently, the problem is NDSolve itself and it seems to be related to ...
145 views

How to format usage messages such that function templates are parsed correctly?

Is it possible to format usage messages (with italic arguments etc) such that Mathematica 9 still parses function templates correctly? For example, plain usage messages work when pressing ...
216 views

Weird behaviour from ListSurfacePlot3D

Looking at Documentation for ListSurfacePlot3D, I follow the basic example presented there. ...
138 views

Exporting large numbers in WDX format

I have a list of 10 000 3Ã—3 matrices in Mathematica. The entries are rational numbers. I would like to write this to a file so I can load it again in the future. After some fussing with file formats, ...
269 views

Mathematica8 can compile this function but Mathematica 9 can't if I set CompilationTarget -> “C”

Following code worked on Mathematica 8, but in Mathematica 9 it can't be compiled, it return this message CompiledFunction::cflist: Nontensor object generated; proceeding with uncompiled ...
280 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 ...
919 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 ...
122 views

StepMonitor not working inside ParametricNDSolveValue

Here is a toy example: ...
285 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: ...
188 views

FrameLabel not printing completely

Running this code: ...
258 views

Upon PDF export, edgeless rectangles do not tile perfectly, and corners may be cut. Is this a bug?

Note: this problem is no longer present in version 10. Exporting the following as a PDF file ...
225 views

ToNumberField won't recognize Root as an explicit algebraic number

In Mathematica 9.0.1, it appears that ToNumberField will not always recognize a Root object as an explicit algebraic number. ...
179 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 ...
223 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 ...
550 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): ...
227 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: ...
673 views

Bug in Solve (Mathematica 9)

Just came across the strangest bug under both Mathematica 9.0.0 and 9.0.1. If one enters: Solve[m == p Sin[x] && -Pi/2 < x < Pi/2, x] ... then ...
1k views

NSolve: Mathematica 9 issue

In Mathematica 8 the following expression evaluates and returns a result in terms of InverseFunction: ...
699 views

DeleteDuplicates not deleting duplicates

It is not surprising that DeleteDuplicates[{5,5.}] returns {5,5.} because DeleteDuplicates ...
469 views

How can I display a multigraph with different colored edges?

I'm new to Mathematica(version 9) and I'm trying to display a multigraph with different colored edges. Here's my code so far: ...
396 views

Mathematica 9 behavior with derivative of a sum

In: D[Sum[Sin[x],x],x] D[Sum[f[x],x],x] Out: 1/2 Cos[1/2 (-1 - Pi + 2 x)] Csc[1/2] 0 Function f is undefined, but Mathematica 9 counts it as constant? ...
560 views

Failure to export graphics by right-click when Notebook magnification is changed

When I try to export graphics as PNG, JPG and other rasterized formats using the right-click and choosing Save Graphic As..., if the notebook magnification is ...
184 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 ...
329 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 ...
1k views

Version 9 Blue Screen or Self-Test Error on Windows 7 64-bit

Update There is now an official response from Wolfram Support on this issue. Having recently installed Mathematica version 9 64-bit on Windows 7, I keep running into Self-Test Errors evaluating ...