# All Questions

263 views

### Why does OS X need permission to allow JLink connections each time it starts?

I understand that JLink loads each time Mathematica launches or each time a kernel starts, and that this can require permission from the firewall, if it is enabled but OS X provides settings the ...
204 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 ...
498 views

### Finding a Graph Shortest Path with Custom Graph Distance Function

What is the best way to find a shortest path by using a custom distance function? I'm trying to play a little bit with the concept of using distributions instead of a deterministic weight value for ...
256 views

### Second-Order Feedback Pathways

I'm relatively new to Mathematica and I've tried searching and reading through the Mathematica documentation but I'm not able to find a good place to start. I want to model a simple, second-order ...
204 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 $\tau$. ...
94 views

### BipartiteMatching hangs with floating-point weights in Mathematica 7 (package Combinatorica)

I am trying to use Combinatorica's BipartiteMatching algorithm on a weighted graph. I need to use real numbers as weights. If I try the following ...
290 views

### Front-end glitch when interacting with dynamic content

This is now bugging me too much to ignore it anymore. When I interact with a notebook that has dynamic content, for example moving a slider, Mathematica regularly brings other open notebook windows to ...
34 views

### Undeclared Identifier error in Compile

I've been trying to compile a couple of functions in Mathematica, and I keep coming across an error that I do not know how to resolve. Consider the following function: ...
53 views

### How to produce timely spoken text?

On my system (Mac OSX 10.10.4) the following code produces only the first utterance. The second one is produce when the user interacts in some way with the front end (mouseover, mouseclick). How can I ...
54 views

### Where's the service status page for Programming Cloud?

I've searched wolframcloud.com and found none. It would be good to know, because I am getting a range of apparently random failures from "Tag List ... is Protected" to "possible crash" (!) to "Cloud ...
33 views

### Tracking features where ImageFeatureTrack finds none?

How is it possible to track common features in the following sequence of images (e.g. holes or corner points along the top margin), ? I have had no luck with ...
36 views

### Setting MaxIterations for neural network function Predict?

The neural network implementation of Predict seems to support a number of undocumented options as shown in a previous question: How to change NeuralNetwork ...
46 views

### String option names for Cells

They seem to be correctly interpreted. I'm asking because of some minor reasons and a major one: NotebookWrite a Cell with WholeCellGroupOpener option I don't know any official confirmation so let ...
31 views

### How to create permanent intra-notebook links

I'm trying to create a documentation notebook for a package and have entries which reference other entries. I'd like to include the hyperlinks in text formatted cells so that when a reader clicks on ...
73 views

### StreamPlot of potential flow from a finite element calculation

I am trying to calculate a potential flow past a thick plate. The finite element calculation seems to go well but I am finding it difficult to get a nice plot of the flow. The stages below are, ...
66 views

### Verification of results given by NDSolve

I am trying to solve a system of ODEs using NDSolve. The differential equations used are obtained by applying method of lines to actual governing equation. The system includes differential equations ...
59 views

### INTERNAL SELF-TEST ERROR: Printing|c|3530

In the last two weeks, Mathematica works correctly, but every time I start it, the following message appears: The link sends me to this page. What happens? How can I correct it? I run version ...
96 views

### What is included in Wolfram Extras?

I recently installed a new version of Mathematica and it includes an optional companion package entitled "Wolfram Extras". Is there any official documentation (release notes?) that details what ...
59 views

### Collapse / expand a balance sheet using an OpenerView

I am a relatively inexperienced Mathematica user, so I apologise if there is a simple answer to this question. I would like to create a balance sheet that can be collapsed/expanded as necessary. I ...
75 views

### RegionIntersection fails for some values with polygons

I want to find the intersection (region) of 2 polygons. I use RegionInstersection but it only works for some sizes, for example, when ...
71 views

### Why Function is compiled?

Function isn't mentioned in the list of compilable function, but it can generally be compiled when it's formed by compilable functions, a simple example is: ...
58 views

### Simple ways to implement vector dilation

Suppose we have a singly connected but not necessarily convex polygon. Something like shape = CountryData["Chad", "Coordinates"]. Is there a simple way to ...
47 views

### Why is the Max function so slow when operating on lists of dates?

Example: dates = DateRange[DateObject[], DatePlus[DateObject[], 15]]; First[AbsoluteTiming[Max[dates]]] (* 21.364247 *) As a workaround, ...
55 views

### AppendTo or Part in a ParallelDo?

I have a question regarding how memory is managed in parallel. Specifically, I'd like to know what is the better practice when constructing an array within a ...
50 views

### Why does FreeQ seem not to work with complex numbers?

I guess I do not understand how Mathematica evaluates this simple expression inside FreeQ ...
78 views

### speed up evaluating a listable function

I apologize in advance for the vagueness, but I can't think of a more descriptive title. I am trying to find the average value of the square of BesselJ[0, x] ...
104 views

### Why is Thread[{ a, b }] the same as Transpose[{ a, b }]?

I understand the idea of both Thread and Transpose, but do not understand whatever nuance it is that makes Thread[{ a, b }] == Transpose[{ a, b }] Where ...
70 views

### Partitioning Table

I have a long vector array in the following format: ...
111 views

### Fitting data to a complicated function

So, where to begin. I have a certain dataset that I want to fit to a function. However, the function is rather complicated (matrix inversions, linearsolve) and does in general not have a closed form ...
27 views

### Collaboration / refererencing in the notebook environment (without Workbench)

Discussing with my co-authors over the phone, I often find it hard to point out a specific input/line/part of a notebook. (I am not using Workbench) The input numbering "In[1,...]:=" helps but ...
51 views

### Nonuniform Savitzky-Golay filter for smoothing and differentiation

The classical Savitzky-Golay filter works only with uniformly sampled data and currently we have at least two good implementations of it for Mathematica published on our site. But in many practical ...
51 views

### simplify expressions into sum function

Is there a way to have Mathematica simplify long expressions involving sums of variables into expressions using a sum function? Suppose I have something like this: ...
81 views

### Stability analysis of transcendental equation (stability crossing curves)

I am working with a non-linear delay system with three scalar delays. After taking the Laplace transform of the linearized system, the characteristic function is a transcendental equation with three ...
117 views

### Graphics different between Mathematica 10.1 vs 9.0.1

When I create the following plot Graphics3D[{ Red, Arrowheads[0.05], Arrow[Tube[{{0, 0, 0}, {0, 0, 10}}, 0.2]] }] It looks like this in Mathematica 9 ...
87 views

### Unknown (internal?) function with DSolve

I am solving With Mathematica 10 the following ODE system: DSolve[{B'[x] == -f[x]*Cos[l]*G[x], G'[x] == +f[x]*Sin[l]*B[x]}, {B,G}, x] The solution is almost ...
69 views

### Symbolically Minimizing a Max function

I'm having a tough time with seemingly simple symbolic Minimization/Maximization in Mathematica. I would like to use the Maximize function to work on some unknown random variables and so use min/max ...
91 views

### Region Intersection for MeshRegion objects embedded in 3D

How can I create a logical intersection of MeshRegion objects that are three-dimensional? The RegionIntersection function will ...
72 views

### Obtain $\TeX$ code as in StandardForm

This is a question very close related to Breaking up long equations in TeXForm. Last time, because @Adam doest not present a clear goal for this problem, as stated by Massimo Ortolano there's no ...
49 views

### Interval Arithmetic with Symbolic Intervals

I've run into a problem with IntervalUnion and IntervalIntersection when dealing with symbolic intervals. The following code ...
51 views

### Export to MX seems to corrupt the in-memory Dataset

I have a function that does a large number of calculations (by calling out to other smaller functions), and then builds a large Dataset object. Then I do two ...
77 views

### Fitting data to plot using errors as weights

I have some enzyme kinetics data that I want to fit to the Michaelis-Menten curve in order to obtain the kinetic parameters of the enzyme. Is it meaningful, statistically and functionally speaking, ...
58 views

### Undo automatic update

I was working with Predict function (with a neural network and today, and when I executed the same notebook I have been working for some time, Machine Learning package was automatically updated (it ...
93 views

### Discrepancy in the series expansion of $\log(z/(z-1))$ in Mathematica 5

When I calculate the series expansion of $\log\frac{z}{z-1}$ around $0$ in Mathematica 5.2, I obtain: ...
43 views

### Indeterminate expression 0(I*Infinity]) on indefinite integrals on first use only

I do not know if this is new or not, I googled before. Windows 7, 10.1 64 bit: Integrals generate this error message The strange thing also is that the message shows up the first time the command ...
54 views

### Applying functions to irregularly distributed Keys in Association lists

This Q is related to this one, but now refer to the situation as irregularly distributed Keys in lists of Associations: ...
64 views

### How to match the arguments of the function in any order

The issue is the following, with a dumb function with (4) arguments of (4) different heads (for each head is always no grater than one arguments): ...
55 views

### Different FourierParameters in each dimension for discrete Fourier transform

I have a query about the Fourier utility, that does discrete Fourier transforms. I am unable to find any information on whether different FourierParameters can be used in each dimension. This is a ...
63 views

### Is it necessary to close MathLink connection?

I use WSTP (formerly known as MathLink) program LoopTools (here is the link with executables and source: http://www.feynarts.de/looptools/). To create connection within Mathematica, I use command ...