1
vote
0answers
102 views

Extracting Facebook Managed accounts (pages) in Mathematica? [duplicate]

I want to use Mathematica to explore various relationships on my Facebook pages. I've been able to successfully extract information on my personal Facebook page using the build in Social Media ...
2
votes
1answer
138 views

Any solution to system of equations?

I need ANY combination of 8 variables which satisfy: a+b+c+d+e+f+g+h=0 a^2+b^2+c^2+d^2+e^2+f^2+g^2+h^2=1 a*b+b*c+c*d+d*e+e*f+f*g+g*h+a*h>2/3 Ideally these ...
7
votes
3answers
525 views

How to use custom Dynamic inside Manipulate

I was wondering if it is possible to use a custom Dynamic[var, function] inside a Manipulate. The reason for the need is this: ...
6
votes
2answers
364 views

How to punch a hole in some 3D distribution of points

Suppose we have a long list of 3D Cartesian coordinates, defining a distribution of random points in 3D space. How could we remove all the points inside a sphere of radius ...
6
votes
1answer
160 views

Position with Except returns first item {0} and last item {}. Why?

Here is a simple list: l={1, 0, 2, 1, 0, 1, 0, 1, 2, 0, 2, 0, 1, 0, 1, 0, 0} To get the position of non-zero elements I use ...
16
votes
6answers
2k views

X-Y scatter plot with coloring dependent on Z value [duplicate]

I have an array of $(x,y,z)$ triples (array dimensions: N x 3), from which I can make a 2D scatterplot of $(x,y)$ values: ...
4
votes
6answers
1k views

Why is this Mandelbrot set's implementation infeasible: takes a massive amount of time to do?

The Mandelbrot set is defined by complex numbers such as $z=z^2+c$ where $z_0=0$ for the initial point and $c\in\mathbb C$. The numbers grow very fast in the iteration. ...
8
votes
1answer
306 views

DeleteDuplicates[] does not work as expected on floating point values

Here is my simple example, and in this case function DeleteDuplicates does not work as expected. I want to FindRoot of my ...
9
votes
2answers
155 views

Unexpected behaviour of SeriesCoefficient?

Following this question/answer I discovered and played with SeriesCoefficient. In particular, I tried ...
11
votes
2answers
256 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 ...
9
votes
2answers
676 views

Find closed form expression for series expansion coefficients [duplicate]

Is there a built-in function that will find a general expression for the coefficient of the series expansion of a function? Series will only give the explicit ...
6
votes
1answer
241 views

Digital Elevation Maps (DEM) are Warped yet ReliefPlot renders as a rectangle - how do i join?

I downloaded several USGS Digital Elevation Maps (DEM files) corresponding to 12 adjacent areas. Each file Imports[] into Mathematica and I can render the individual ...
1
vote
0answers
268 views

Data structure for a list of actions

The idea: I need to generate a sequence of events then run a "propagator" over the list of events where the "propagator" will update the state of the following event. I can then write functions that ...
4
votes
2answers
177 views

How to use ScientificForm in computation

Lets say I want to add 2 values : ...
4
votes
0answers
370 views

Cubic polynomial interpolation with velocities listed rather than some points

I am trying to use the function BSplineFunction[] to create a natural cubic spline. Normally what is done is that you specify "SplineDegree -> 3" and include a list of points and it will carry out ...
7
votes
2answers
839 views

How can I mesh a solid cylinder with triangular or tetrahedral elements

I need to plot triangular mesh on a cylinder. However the function Cylinder doesn't have a mesh option. By using ...
4
votes
1answer
654 views

Controlling ColorFunctionScaling

Is there a way to control the scaling of ColorFunction beside just to turn it off and on with ColorFunctionScaling? Two ...
25
votes
7answers
940 views

Graphical representation of a moving sound source

Some explanation since I have got a specific and another more open-ended question: I used two microphones in a 90° arrangement (see picture below) to capture sound from a source moving around the room ...
5
votes
3answers
575 views

Replace very small numbers by zero in the output of a list

I have a long nested list, but many elements are numbers of order 10^-18 or less, eg ...
3
votes
1answer
72 views

DateString and localization, $Language ignored

I have a DateString calculated in English. Now I would like to change the output according to localization. I have read that localization is possible for Menu, ...
2
votes
0answers
84 views

Exporting large numbers to a text file [duplicate]

I need to export large numbers to an ASCII text file, but as simple digits without powers of ten, e.g. I need to write 123456.789 to the file and not 1.23456789E10^5. It seems like such a simple ...
9
votes
5answers
629 views

Randomly assigning color to Graphics3D objects?

I have a set of Graphics3D primitives (here, spheres) which I would like to assign either: (1) One of a subset of colors, e.g. {Green, Red} (2) A random color over some RGB interval Writing ...
5
votes
2answers
208 views

Integrating a list of functions

For the purpose of this minimal example, let's say we have a list of functions, like this: f[y_?NumericQ] := {NIntegrate[z*y, {z, 0, 1}], a y} I want to ...
4
votes
1answer
245 views

Using the LQGRegulator to build a human operator model

I'm trying to build a human operator model using an optimal control model in Mathematica: The vehicle dynamics are given by ...
7
votes
2answers
287 views

Tick marks shrinking with ImageResolution [duplicate]

High resolution PNG export is handy for print quality plots, however tick marks are not scaling properly. Does anyone know a solution or a work-around, preferably for M7 (on Win7)? ...
10
votes
4answers
573 views

How do I solve this probability problem with Probability?

Consider a stick of length 1. Pick two points uniformly at random on the stick, and break the stick at those points. What is the probability that the three segments obtained in this way form a ...
7
votes
1answer
216 views

How to plot inequalities taking into account that points must be integers and not reals?

I have solved with Mathematica 9 the following integer inequalities using Reduce: ...
9
votes
3answers
818 views

How do I remove a bounding box (i.e. set Boxed -> False) after rendering a 3D graphic?

I have an old notebook with an output from Graphics3D, however, I've lost the data behind the output and recomputing it would take days. I simply want to remove the bounding box Mathematica usually ...
6
votes
2answers
278 views

Mathematica ncurses support

I occasionally ssh into machines that have Mathematica installed. I then operate Mathematica through the command-line interface. Often, the command-line interface ...
3
votes
0answers
154 views

How to change Mathematica cursor globally? [duplicate]

I usually use my OS with negative colors (to keep my eyes calm...). I had seen a function called MouseAppearence that changes the cursor. I would like configure ...
1
vote
1answer
223 views

Is my system too complicated for Solve?

I am trying to solve a system of three nonlinear equations using Mathematica. Solve takes forever to run and never solves my system of equations. Is my system too ...
5
votes
1answer
305 views

Specify a constraint on an interval under FindMinimum

I have an interpolated function that looks like this: $\hskip1.2in$ and, based on extreme and critical points, I want to use a polynomial to approximate the function. The points in question are: ...
17
votes
3answers
512 views

Using Refresh[..] with TrackedSymbols

This is a very basic question, but I don't understand the following behavior. The usage to Refresh reads represents an object whose value in a Dynamic should be ...
2
votes
1answer
231 views

Syntax for integrating over limits specified by a Table

I wish to use NIntegrate to compute multidimensional integrals. However, I don't want to manually input the limits for the dimensions. I want to store the ...
4
votes
1answer
372 views

Doubts on scripting: error messages when trying to run and how to process lots of files

I have created my first mathematica 'program' as I think of it, to do some image processing. After reading in an image, it does a lot of stuff (including smoothing, fourier transform, functional ...
6
votes
0answers
265 views

Computing Ehrhart's polynomial for a convex polytope

Is there a Mathematica implementation for computing the Ehrhart polynomial of a convex polytope which is specified either by its vertices or by a set of inequalities? I am interested in knowing this ...
0
votes
2answers
294 views

Integrating polynomial functions over polytopes with an add-on package

There is a Mathematica package to evaluate integrals over polytopes: http://library.wolfram.com/infocenter/Books/3652/ In the documentation (Functions.nb file) I ...
20
votes
1answer
588 views

Can Enterprise Edition really encrypt code for distribution via CDF?

The Wolfram blog post: Using Mathematica Enterprise Edition to Create Professional Apps, Tools, and Reports makes the following statement (emphasis mine): Enterprise Edition allows you to create ...
4
votes
2answers
329 views

Image Rotation, Line Symmetry

I'd like to import an image, superimpose it, reduce the opacity of the overlaid image, and then use a manipulate to rotate the top image to illustrate rotational symmetry. The image below is using ...
1
vote
1answer
102 views

Is there a cleaner/shorter way to select-replace in matrices? [duplicate]

I love Mathematica, but I find it oddly lacking when it comes to how matrices are handled. Here is an example of code that works but seems like it should be a lot shorter (and minus the loop). I'm ...
7
votes
2answers
3k views

Axes Origin & Labels in 3D Plot

I'm looking for a way to have the axes at the origin in a 3D plot and to label the (x,y,z) axes in the usual way---with x near the end of the drawn portion of the x axis, y near the end of the drawn ...
2
votes
1answer
174 views

MatrixPlot for DFT in black and white with ContourLabel

I have several data files such as this: ...
19
votes
2answers
1k views

What can webmathematica do that CDF cannot do?

I've been reading a number of questions and answers on this site that deal with the various capabilities of CDF (computable document format). It seems like sometimes the answer is to make sure to use ...
4
votes
1answer
173 views

Alternative updating of a dynamic expression

I am looking for a solution to selectively update a dynamic expression expr which is dependent on multiple control variables ...
3
votes
1answer
450 views

Radial Random Walk

I'm trying to generate a spherical distribution of radial random walk points in 3D space. The following code works, but the random walk lines aren't radial. Why ? Where is my mistake ? ...
2
votes
2answers
940 views

How can I invert the colors in a color bar

I have this Mathematica code ...
15
votes
5answers
777 views

Iterate until condition is met

I want to find the first 5 prime numbers of the form $n^6 + 1091$. I have used this code: Timing[Select[Table[n^6 + 1091, {n, 10000}], PrimeQ, 5]] Which gives ...
7
votes
1answer
1k views

How to zoom and pan a ListLinePlot?

I'm using ListLinePlot inside a Manipulate function to display some data. I've seen that Mathematica allows zooming and panning ...
4
votes
1answer
191 views

combined 3D graphics with no interface

I'd like to combine several 3D graphics, but the interface, indicated by the arrow in the figure attached between them is alway present. How to eliminate it? Thanks in advance. Here is my example: ...
0
votes
0answers
182 views

Command completion in Wolfram Workbench 2 vs command completion in Mathematica 9

I don't have access to Workbench 2, but I tried a trial version of Mathematica 9. On reading about the features of Workbench 2, I found that it also supports code completion. I am looking forward to ...

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