2
votes
1answer
296 views

Cropping a non-cubic lattice unit cell

I would like to crop the hexagonal close-packed system as a hexagon and not as a cube. I would like to use the following volumetricPlot already given on this ...
1
vote
1answer
105 views

ListPointPlot3D in a Manipulate

I have a program using Manipulate. The program given certain values will compute some values. I want these values to appear in a 3D list plot but the problem I am ...
1
vote
1answer
48 views

Evaluation of m.v is blocked by applying MatrixForm. Why? [duplicate]

I'm trying to understand what is happening in the notebook session below. I have a 2x2 matrix m = {{-1,-1}, {-1,-1}}. And a vector ...
3
votes
1answer
122 views

Export LocatorPane as image by button

How to Export LocatorPane as image by button or at least by something else? Kuba, thank you! Your method works in a simple case: ...
3
votes
4answers
548 views

Interpolating a plot with missing values

With data = {{1, 1}, {2, 2}, {3, 3}, {4, 4}, {5, 5}, {6, 6}, {7, 5}, {8, 4}, {10, 3}, {10, 2}, {11, 1}} and ...
11
votes
1answer
1k views

Can Mathematica do two evaluations at the same time?

When one evaluation is running, if I want do another evaluation, Mathematica will put the second one in the queue and run it after the first evaluation finish. However, the first evaluation may take ...
1
vote
1answer
144 views
2
votes
1answer
188 views

Is there a better way to create my rotational-symmetric (180 degrees) rectangles?

I have created a simple way to create rotational-symmetric (180 degrees) rectangles, but my stuffit function bothers me. No matter what I tried, I couldn't get it ...
3
votes
1answer
317 views

Remove borders in a series of images

I have a series of mouse MRI images, here are two How can I automatically remove the metal cage around the mouse to make it look like this: The position of the cage is not always in exactly ...
4
votes
1answer
360 views

How do I built a zoomable Koch curve?

I'm new to Mathematica and my goal is to write a simple program in order to demonstrate self-similarity of the Koch curve by zooming in. Here is a good example of what I mean (it's a Java applet). I ...
4
votes
1answer
121 views

Highlight the same symbol throughout notebook

Once I saw people using Matlab use a keystroke shortcut that made all the same symbols as a selected symbol become blue. I am wondering is there is a function in Mathematica that is similar. If so, ...
12
votes
6answers
483 views

Correct way to integrate a certain function

I want to integrate $$\int_{0}^{2\pi} dt_1 \frac{a + b\cos(t_1 - t_2)}{c + d\cos(t_1 - t_2)}$$ where $a, b, c, d, t_2$ are real numbers and $c + d > 0$ & $0 \leq t_2 \leq 2\pi$. I used a ...
8
votes
1answer
113 views

Does the syntax coloring I see indicate a real problem?

I need a behaviour provided by: x = 2; Block[{x = HoldForm[x]}, x] x FrontEnd marks ...
4
votes
1answer
73 views

Apply a function to the current selection in place

Say a have the function foo: foo[x_] := x + 2 Like the Evalution ...
1
vote
1answer
189 views

How to simplify an expression into the sum of small fractions

I'm trying to simplify the following expression $$\frac{n.r \ p.q - (n.p + n.q) (p.r + q.r)}{(n.p + n.q)\ p.q}\to \frac{n.r}{n.p+p.q}-\frac{p.r+q.r}{p.q}$$ When I put it into Mathematica and use ...
2
votes
2answers
417 views

Convert DelaunayTriangulation-> Graph->AdjacencyMatrix

Is there a way to convert a Delaunay Triangulation into a Graph structure so that one can generate an AdjacenyMatrix of the Delaunay?
2
votes
1answer
370 views

Generate a set of 3D coordinates subject to constraints

Generating a set of random 3D coordinates is ok, e.g. ...
1
vote
3answers
158 views

Correct graphical representation of a discrete function (PMF)

I have a list: {1,2,2,3,3,3,3,4,4,5}. I want to plot the percentage occurrence of elements in the whole list. So the list plot I want to do is: ...
0
votes
1answer
60 views

Failing to get colours in Plot [duplicate]

When I plot the functions generated by NestList, I do not see differently coloured lines, which I do if I explicitly list them out. I.e. with: ...
2
votes
4answers
181 views

Replacing High Densities of 1.s in Very Large Binary Arrays

I am working with very large binary arrays on the order of {100,100000}. It may look something like this. ...
1
vote
0answers
221 views

Diagonalization in parallel

I would like to diagonalize one unitary non-sparse matrix of size 12870 with complex number entries (not symbols, this is really a numerical problem). Is is possible to make eigensystem run in ...
0
votes
1answer
129 views

How can I add points on a plot?

I have a list of points that I want to a plot, but I can't figure out how to do it with Epilog. Here's the code I have so far: ...
5
votes
3answers
461 views
4
votes
3answers
978 views

Generating list of alphabet letters

I want to create a list of length n with the letters of the alphabet. For example, if n = 3, by list would be ...
3
votes
1answer
97 views

Why are graphics rendered as MathML when I set $PrePrint = MathMLForm?

For external usage, I set output in MathMLForm by using $PrePrint=MathMLForm Everything goes well but makes graphics rendered ...
4
votes
1answer
899 views

Integrating a functional of an InterpolatingFunction

It is straightforward to Integrate an InterpolatingFunction. However, even for a simple functional of an ...
1
vote
2answers
123 views

ToExpression and Fortran notation

ToExpression["9.0E-03"] interprets the string as 9*e - 3 instead of what I am expecting: ...
3
votes
1answer
251 views

Convert Tube[BSplineCurve[…]] Graphics3D object to polygons [duplicate]

I wish to voxelize a complex shape composed of Tube[BSplineCurve[...]] objects, while maintaining the additional information of the (unvoxelated) surface normal ...
3
votes
1answer
450 views

How to eliminate the margin between figure and frame in DensityPlot? [duplicate]

In DensityPlot, how to get rid of the white margin between the figure and the frame so that the figure itself spans the entire domain? ...
3
votes
1answer
1k views

Plot a function based on Derivative - Gradient field

I'm trying to plot the gradient field of a function in such a way that is possible to change it easily, only editing the function. Consider the code: ...
1
vote
3answers
103 views

FullSimplify assumptions for function body

I'd like to pass an assumption to FullSimplify so whenever it gets a function that is squared and square rooted would return me only the function body, without ...
0
votes
1answer
87 views

How do I get a different (random) independent edge set each time I run FindIndependentEdgeSet?

I'd like to use FindIndependentEdgeSet[g] repeatedly to get random maximal matchings of a fixed graph, but each time I call this function it gives me the same answer (i.e. the same list of edges). ...
1
vote
0answers
73 views

Package FiniteFields

In a Mathematica session, I evaluate: Needs["FiniteFields`"]; fld = GF[2]; Now, for example, I'd like to compute $a^3+a^5$ for $a \in{Z_2}$. The result I'd like ...
0
votes
1answer
193 views

Using variable with delay in WhenEvents in NDSolve

I have a system of differential equations which is solved correctly. However, I want to trigger two events, one of which depends on the "time elapsed" after of the first event trigger. Is it possible ...
4
votes
1answer
143 views

What is the formula Mathematica uses for ZetaZero?

What is the formula/algorithm Mathematica uses for the ZetaZero command?
0
votes
1answer
82 views

Abstract algebra: define constants in a finite field

How can I to define a constant in $Z_{2}$? For example, I want to create a constant b that inherits the properties of an element from $Z_{2}$. For example ...
2
votes
1answer
140 views

Why is ListLogPlot skipping entire decades?

I'm having an issue with Mathematica wherein, when trying to use ListLogPlot, the scale of the y-axis skips entire decades. Instead of 1, 10, 100, 1000, it goes more like 10^2,10^4,10^6,10^8. I need ...
1
vote
1answer
101 views

Apply function to output of previous function

I am trying to write a function that takes 3 tuples. Each tuple contains two lists which are first divided. This results in 3 lists. Then I want to take the Mean of all the columns. I can do this ...
2
votes
2answers
180 views

How can I remove edges from my DiscretePlot?

By default, DiscretePlot displays "edges" along the sides and, prominently, align the top when ExtentSize -> Full is set. For ...
3
votes
2answers
175 views

Passing an internal static class in JLink?

I am trying to get started with the Stanford NER tools tools in Mathematica, and am having difficulty translating the demo they provide into JLink. The relevant code in the demo is: ...
7
votes
1answer
116 views

Unify the sampling of NIntegrate[ {f, g, h} w ]

I'm trying to numerically integrate a function which has a vector-valued slow part and a much faster component which is shared by all the components, i.e. an integral of the form $$ ...
13
votes
2answers
537 views

How do I get Mathematica to return a function call unevaluated?

How do I get Mathematica to return a function call (conditionally) unevaluated? I expect this may use the slightly-mysterious Hold function. As a toy example, ...
0
votes
0answers
36 views

Data Fitting with xerrors and yerrors using findfit [duplicate]

I'm trying to fit data with xerror and yerror using "Findfit", so i'm trying the same form than in tuto : ...
0
votes
1answer
88 views

A problem with parallelize

I am experimenting with Parallelize and ParallelTable This is the code I am using: ...
0
votes
0answers
49 views

Get value for a variable from user inside a module [duplicate]

I am writing a module. When I run the module, I want it to ask for a variable, like I can in other programing languages such as C++ or Python. For example, in C++: ...
0
votes
0answers
83 views

Evaluating expressions stored in notebook from Java

The Mathematica kernel can generally open a notebook and evaluate the functions present in the notebook using UsingFrontEnd Command. Example: ...
1
vote
1answer
94 views

Adding a legend to a MatrixPlot

I have produced this MatrixPlot: Rows refer to countries and columns to ranks. Row 1 refers to Norway with many 1 ranks, row 15 to Greece with many 15 ranks. Other countries are inbetween. I would ...
-1
votes
1answer
94 views

How to draw a network from a dataset reporting the labels of nodes of every link?

I have a dataset in format .txt of a directed network, containing a matrix A of dimension ...
8
votes
1answer
117 views

Maximum number of literal values for SetDelayed?

Under what circumstances should I expect Mathematica to turn a delayed assignment into an immediate assignment? I have put together a minimal example (available here) which demonstrates this behavior. ...
1
vote
1answer
121 views

Matrix and string variable

There are $100$ .dat data files which contain numerical parameters. ...

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