3
votes
0answers
245 views

How to compute the Lovász number for the given graph in Mathematica?

Here is a graph whose adjacency matrix is ...
3
votes
1answer
107 views

obtaining real roots of negative numbers in a long expression [duplicate]

I have a complicated symbolic expression which contains many terms like $(a/(a-2))^{1/m}$, where $a/(a-2)$ could be positive or negative after replacement. I only need the real root after ...
1
vote
2answers
268 views

Approximate solution to system of polynomial equations

I'd like to solve approximately the following system of equations for $a_1$, $a_2$, $\alpha_1$ and $\alpha_2$ all real and nonzero: ...
9
votes
2answers
620 views

How to position text labels automatically to not overlap other graphics elements?

I was plotting reciprocal frame projection using Locators for a point to be expressed in terms of both the original basis (also specified with ...
4
votes
3answers
199 views

Variable partitioning of the data in the form of “list of lists”

I am looking for a way for variable partitioning of the data in the form of a "list of lists" for interpolating the imported data from excel. The data looks like: ...
3
votes
1answer
132 views

How to use ChoiceDialog or PopupMenu with ClickPane

What I am trying to do is modify the standard ClickPane example where a list of points (pts) is added to with each click, in the ...
8
votes
2answers
912 views

How could I generate words starting with P,h,D?

A friend of mine is a PhD candidate and posted a picture on Facebook with funny words starting with 'p', 'h' and 'd' like "Please hire. Desperate" or "Permanent head Damage". I thought I could try and ...
0
votes
0answers
81 views

Group theory - symmetry inequivalent sqaure matrices with PBC

I would like to obtain the symmetry inequivalent possible occupations of indistinguishable objects in a square lattice with periodic boundary conditions. Examples: 1 object in a 4 by 4 square ...
6
votes
2answers
491 views

Slice through Graphics3D

is there any possibility to slice through a Graphics3D object? At the end I would like to have a stack of images slicing , e.g. $n$ times in $z$-direction: $((x,y,z_{0}), (x,y,z_{1}),…,(x,y,z_{n}))$ ...
0
votes
1answer
69 views

LMS distance from a point to an InterpolatingFunction

I have a short script to NDSolve a second-order nonlinear BVP, which as its output produces an InterpolatingFunction object. I ...
6
votes
1answer
469 views

Getting clearer StreamPlot output

When I do a StreamPlotof a rather complicated pair of differential equations, it loses some details. For example: ...
3
votes
1answer
183 views

Levels and slots

I am struggling with levels and #, if I understand this I think I will be able to grasp the entire concept. ...
1
vote
1answer
654 views

Direct sum of matrices [duplicate]

Is there a simple way (perhaps even a built-in function) that allows one to compute the direct sum of two square matrices?
21
votes
5answers
548 views

Compiling ColorFunction for faster complex phase-amplitude plots

I have gotten into the habit of plotting complex-valued functions on a plane using a color-function along the lines of ...
7
votes
1answer
171 views

Raise systemwide keypress event

Is there a way to raise system-wide "keypress" events programmatically from within Mathematica? Say "Ctrl+C" or "Ctrl+V", which all other programs can recognize? This is an attempt to gain simple ...
5
votes
1answer
187 views

Why is $ProcessorCount different than the selected number of cores in PBS?

By using ParallelTable and submitting my Mathematica code to a cluster, I noticed that it was enhancing the speed even when I selected a single core in a single ...
0
votes
0answers
153 views

System of integral equations with integrals on both sides

I'd like to solve the following equation numerically for $a_1$, $a_2$, $\alpha_1$ and $\alpha_2$: $\displaystyle\int_0^{\infty}\Big[L_1\Big(\frac{k^2}{2}\Big)\Big]^2e^{-k^2}L_m(k^2)\ dk=$ ...
0
votes
1answer
132 views

How can I replace UndirectedEdges to pairs of bi-directional DirectedEdge in a Graph?

How can I have pair of edges between nodes in this kind of graphs? ...
3
votes
1answer
386 views

Cartesian product of sets

I have two types of sets, one of them is a list of points of the form $\{t_{k}\}$ and the other one is an interval of the form $[a,b]$. And my custom set consists of these type of sets and I need to ...
4
votes
1answer
114 views

Set the style of a cell

I know it's possible to programmatically change options on the selection in a notebook. I'd like to create a button that lets me change the style of a cell. It's a style that doesn't have a keyboard ...
1
vote
1answer
264 views

Simplifying with noncommutative multiplication

I am trying to do some quantum algebra computations in Mathematica. Up to now I was able to make the noncommutative multiplication linear and to factorize powers. However, I still have some issues ...
7
votes
2answers
301 views

Find asymptotics of Sum[2^i*Binomial[n-i-1,2*n/3-1],{i,0,n/3}]

I have an expression 2^n / Sum[ 2^i Binomial[ n - i - 1, 2n/3 - 1], { i, 0, n/3}] ...
1
vote
3answers
148 views

How to write equal subset

I have a unique set S={1,1,3,3,3} but from this unique set I can create many combinations like {1,3,3,3,1}, {3,3,1,3,1}, ... I ...
0
votes
0answers
35 views

Obtain the coordinates of a point by clicking on it [duplicate]

Is it possible to show the coordinates of a point in a plot by clicking on it ? For example you click on one point on the plot below and you get the point's coordinates.
3
votes
1answer
178 views

Namespaces in Mathematica

In many programming languages one can define a namespace with namespace abc How can the similar be done in Mathematica? The ...
10
votes
0answers
598 views

Using TetGen in Mathematica to get 3D Voronoi diagram

In this post, the use of TetGen for 3D Voronoi tesselation has been briefly discussed. However there is still no info about the use of TetGen to generate a 3D Voronoi diagram. The TetGen documentation ...
10
votes
2answers
293 views

Filling Fill incomplete in ListLinePlot

...
4
votes
0answers
85 views

JewishNewYear date limitation

The documentation for the function "JewishNewYear" in the "calendar" package declares that the year argument must be between 1900 and 2100. No explanation is given for this limitation. The function ...
8
votes
1answer
168 views

Quickly selecting for points in a set that are within a critical distance of points in another set

Imagine two lists of two-dimensional coordinates: listA = RandomReal[{0,100},{202,2}]; listB = RandomReal[{0,100},{97,2}]; I'm attempting to quickly generate a ...
13
votes
4answers
858 views

What is the most elegant way to display multiple graphs with a common title?

I often seek to display two graphs, side by side, with a common label over them. There is no option for adding a label to GraphicsRow, which means, I think, that I ...
3
votes
1answer
123 views

Use URLFetch in init.m

I'm not able to use URLFetch in my $UserBaseDirectory/Kernel/Init.m as it always returns ...
4
votes
2answers
204 views

CMYK colours changing

If I draw a coloured diagram like Graphics[{CMYKColor[0, 0.83, 1, 0], Rectangle[{0, 0}], CMYKColor[1, 0, 0, 0], Rectangle[{0.5, 0.5}]}] and select the red ...
4
votes
1answer
159 views

Can I compile a function containing ArcTanh?

Can I compile a function that contains ArcTanh[]? The following doesn't work Needs["CCodeGenerator`"] c = Compile[ {{x}}, ArcTanh[x]^2]; c[2.5] Mathematica gives ...
0
votes
0answers
44 views

Eigenvalues of a matrix, rhombus/hash sign [duplicate]

I wanted calculate the eigenvalues of A = {{0, 1, 0, 0}, {a, b, c, 0}, {0, 0, 0, 1}, {d, 0, e, f}} Then assigned the parameters a value ...
2
votes
1answer
161 views

Fraction Alignment in Plot Export to JPG [duplicate]

I've produced some plots that have fractional tick labels on the horizontal axis and they look fine. ...
0
votes
0answers
32 views

Custom FrameTicks not working [duplicate]

I would like to have a custom ticks on x-axis on my ListPlot, but nothing is showing, what am I doing wrong? ...
5
votes
1answer
221 views

Embedding StreamPlot in Graphics3D

I am trying to visualise the action of the infinitesimal generator of a Lie group on the solution of a 2-ODE system drawn in the 3D space (t,y1,y2): t is time and y1,y2 are the two dependent ...
1
vote
1answer
155 views

Input text field GUI [duplicate]

Is there a way to input multiple rows of text and save it as a variable? Like an InputField, but with multiple rows? I would like to make a simple text redactor, so that I could enter a text and then ...
7
votes
2answers
157 views

Can I Print to a different notebook? (within the context of the same kernel)

Please imagine a simple loop: For[i=1,i<=100,i++, Print[i]; ]; We can ask Print[] to output $(1,2,3,4,...)$ to a ...
7
votes
1answer
100 views

Why does Rescale performance vary significantly based on the real number values in a list?

I have a list of the form: testList = Table[{Flatten[RandomReal[{-200, 200}, {1, 2}], 1], RandomReal[{-200, 200}, {69, 2}]}, {i, 1, 100}]; And I would like to ...
3
votes
2answers
120 views

Creating a trigger to update a previous ListPlot output with new data

Imagine I'm running a loop that's manipulating and changing elements in an array. Is it possible for me to create a ListPlot output in my notebook that updates on ...
6
votes
0answers
153 views

Finding hidden treasure (aka finding undocumented functions) [duplicate]

I was searching for a way to determine if a point is within a polygon and stumbled upon rm -rf's answer. (actually, I really wanted to find a point within a ...
6
votes
1answer
577 views

How do I calculate Standard Deviation confidence intervals in Mathematica?

I have a series of simulation results and I would like to demonstrate how the confidence interval for the mean and standard deviation decrease as the number of results increases. I have done this for ...
2
votes
1answer
586 views

How to show factorial in expanded form with variables

When evaluating the following (Factorial[n + 1]/Factorial[(n + 1) - (k + 1)]) with Mathematica 9, the result is sent to output as ...
5
votes
2answers
929 views

How to find the non-differentiable point(s) of a given continuous function?

For example, the non-differentiable point of the function $f(x)=|x|$ is at $x=0$. How to find the non-differentiable points of a continuous function that is defined numerically?
4
votes
2answers
578 views
9
votes
1answer
539 views

Example program for calling Mathematica from C

I want to call Mathematica from a C program. Suppose I have two numbers x =2 and y=3. I want to define the x, y in a C program and call Mathematica and I want Mathematica to do the sum and return me ...
8
votes
3answers
430 views

Create sine function with random increase in phase

I am trying to simulate a signal that randomly increases its phase, so far I have tried two thing but neither worked. I usually use matlab but I want to learn some Mathematica so I thought I would try ...
11
votes
1answer
310 views

Can Manipulate controls have the option Appearance -> “Labeled” by default?

I was wondering if there's a way to tell Mathematica to use the option Appearance -> "Labeled" for all Manipulate commands by ...
4
votes
1answer
169 views

How to change the aspect ratio with drawing tool?

I'm drawing an image in editing an slide show with the drawing tools. But the aspect ratio of the created drawing seems fixed and not changeable with mouse dragging the border and corner as in other ...

15 30 50 per page