3
votes
1answer
63 views

Pathological behaviour when evaluating a sum

When I declare the function $f$ as follows: f[n_] := Sum[x/Sum[Sqrt[y], {y, 1, x}], {x, 1, n}]/n the input ...
1
vote
1answer
125 views

In a manipulatable graph, display x values of all intersections with one of the lines?

I'm doing a project about Moore's law, I'm trying to create a graph that which you can manipulate, but I want the x-values of the intersections with one the lines to be displayed; how would I go about ...
0
votes
0answers
177 views

Trace of intersecting planes

I have a set of curved planes that intersect each other. I only want all the parts of all planes displayed that are above the intersecting traces. Further, I would like to highlight the intersecting ...
2
votes
1answer
373 views

Creating a C++ project with Visual Studio 2010

I am trying to create a GUI using Microsoft Visual Studio C++ 2010 by calling Mathematica in my codes. I have done everything step by step as mentioned here Then I wrote this code as mentioned in ...
27
votes
3answers
1k views

Create a torus with a hexagonal mesh for 3D-printing

I am new to Mathematica, and I'm looking for a way to create patterns on the surface of 3D objects. One thing I have not been able to do is create a hexagonal mesh on a torus. What I would like to ...
10
votes
2answers
349 views

Get tab key to indent a block of code

Is there some way I can change Mathematica keyboard behavior so I could select a block of text/code, press tab, and the selection would be indented to right? Similarly, I would like shift+tab to ...
1
vote
0answers
41 views

How do I change a ColorFunction filling to be top-down as opposed to left-right? [duplicate]

I've been stuck on a seemingly simple Graphics issue for quite a while now... I am trying to make a temperature distribution Plot that will have a colorFunction filling to show red when at a higher ...
0
votes
2answers
149 views
7
votes
1answer
397 views

How to visualize the structure of this dynamic programming code

I am studying Mr. Wizard's answer to this question which tries to identify elementary circles in a graph. That answer uses dynamic programming technique to simplify the code. The underlying guideline ...
0
votes
1answer
234 views

Animation of 2 Differential Equations - 1 Independent Variable

I have effectively 1 differential equation that had to be broken up into 2 (max number of steps reached). I have gotten the solutions for both using NDSolve and have plotted each together. Now, I am ...
2
votes
5answers
493 views

Generating a list of integers that roughly satisfy a distribution

Say I have a normal distribution, NormalDistribution[25, 7] I'd like integers from 1 to 50, not sampled at random from that distribution, but sampled in a way ...
3
votes
3answers
105 views

Zooming the interval arround $0.333\cdots $, whats wrong?

I'm trying to zoom the interval arround $0.333\cdots$ with: ...
2
votes
2answers
184 views

BarChart include multiple fields on x-axis

I want to chart data using a BarChart, the labels on the x-axis should consist of three values, however I can only use one of the values (the street name), where I would like to include the city and ...
11
votes
2answers
218 views

Probability of the sum of the largest n samples

15 numbers are randomly chosen from U(0,1), what is the probability that the sum of largest four numbers is greater than 3.5? ...
1
vote
4answers
98 views

Question about sum and list in a function

I have a list of this form: $ lst =\left\{\left\{q_1,x_1,y_1,z_1\right\},\left\{q_2,x_2,y_2,z_2\right\},\text{...},\left\{q_n,x_n,y_n,z_n\right\}\right\} $ I want to use this list in the function: ...
8
votes
0answers
163 views

Check whether a working CCompiler is installed

Let me give a bit background: As many of my answers imply, I often use the auto-parallelization (meaning, that Mathematica distributes the calculation automatically over several cores when ...
5
votes
2answers
402 views

How to input formula embedded in text

I'm creating a styled notebook showing a simple theorem. I can set cell style as text or theorem or code to satisfy my requirement. But when I explain the theorem, I need to embed formula (not ...
1
vote
3answers
155 views

Deleting Vertices in GridGraph

Take a simple GridGraph: g = GridGraph[{3, 3}, VertexLabels -> "Name", ImageSize -> 150, ImagePadding -> 10] I am ...
17
votes
1answer
504 views

Fast DensityPlot

Is it possible to increase the perforamce the DensityPlot? For example, let's try to plot this "flower" ...
2
votes
1answer
342 views

Bounded Voronoi Diagram

I am trying to compute a Voronoi diagram bounded by a box. In some cases, the points used to compute the diagram form a diagram such that at least two boundary points are within the same polygon. For ...
2
votes
1answer
201 views

See Local Variable at breakpoint within MODULE?

Within the debugger, can we watch local variables within a Module? As the screenshot shows, the “i” only display its global value (12) upon a message breakpoint. Is there a way to show its local ...
1
vote
1answer
583 views

Error messages from NDSOlve

I am trying to solve a boundary value problem with NDSolve. The code is: ...
3
votes
1answer
102 views

Why is held expression evaluated?

Context: I'm studying non-linear dynamics. As part of a bigger problem, I'd like to generate lists of the form {{deq, ic1}, {deq, ic2}, ...}, where ...
0
votes
0answers
104 views

DSolve not giving solution expected

I'm trying to solve the ODE $\frac{\partial M}{\partial \tau} = [ 4 c_3 N(\tau) + c_1 ] M(\tau),$ where $N(\tau) = \frac{q}{2 c_3} \frac{ 1 }{c_2 e^{2 q \tau} + 1} - \left ( \frac{ q + c_1}{4 c_3} ...
3
votes
1answer
98 views

Cannot use CTRL + F and UN/COMMENT

I would like to ask a question with Mathematica 9.0.1. I find that both FIND: CTRL + F UN/COMMENT: ALT + / become unavailable. Pressing the shortkey or selecting from the menu could not activate ...
0
votes
1answer
63 views

Different integral when used with assumptions

I want to calculate an integral, but Mathematica gives me different results if I am more specific with the Assumptions option of ...
3
votes
0answers
95 views

Tools for Stability/Automatic Error Analysis in Mathematica

I have a longer analytic expression in several variables containing special functions and others. Does Mathematica bring tools - or are there any packages - to examine the stability when I evaluate ...
1
vote
1answer
167 views

ListPlot with high precision

I have a list of numbers, e.g. {{1.,0``27.698970004336022},{2.,0``27.698970004336015}} but usually much longer, suitable for ...
1
vote
3answers
110 views

Detecting the existence of an element in a subarray with specific properties

If I have an array that looks like this: ...
8
votes
2answers
691 views

Can you apply the Cellular Automata function to a grid containing numbers?

Im attempting to simulate a simple evacuation model using cellular automata theory.My study aims to determine whether Cellular Automata can effectively represent how people would behave in a fire ...
6
votes
3answers
149 views

Expected sum of largest 3

I pick 4 numbers from the Uniform Distribution. I need the expected value of the sum of the 3 largest. I am pretty sure that the answer is 9 / 5 which agrees with a simulation. I would like to get ...
8
votes
1answer
277 views

How does LocationTest choose its “AutomaticTest”?

Is there a way of determining how LocationTest chooses its "AutomaticTest"? Sometimes it's clear from the ...
0
votes
1answer
183 views

Reduce Cannot Solve Complicated Function

As per the answer to this question: SolveAlways rejects inequality, I tried the following commands: ...
0
votes
1answer
111 views

SolveAlways rejects inequality

I have two functions of x, f and g. f[x] = g[x] + 2, ...
0
votes
2answers
74 views

How can I make my output to be added to an existing list?

v = {{0, 0, 0}, {1, 0, 0}, {1, 0, 1}, {0, 1, 1}, {1, 1, 1}} For[i = 1, i < 6, i++, For[e = 1, e < 6, e++ 1, Print[Mod[v[[i]] + v[[e]], 2]] ]] I ...
9
votes
1answer
359 views

Fitting Vogel's formula for phyllotaxis to the image of a flower

After having read this question I was inspired to investigate how we could take an image of a plant displaying phyllotaxis and fit Vogel's model of phyllotaxis to the image. The theory is very simple. ...
1
vote
1answer
133 views

how to show or find full path of file listed in the File->Open dialog?

This question was posted 2 days ago at community. I had a good answer but it does not quit do what I wanted. Hence I am trying here to see if someone might know of some other solution. Here is the ...
2
votes
2answers
187 views
4
votes
1answer
370 views

Export Plot from Table to $\LaTeX$ — conform with pgfplots

General purpose My intension is to use data created by Mathematica as in Export Plots to $\LaTeX$, $\LaTeX$ and Mathematica, or How to export multiple Barcharts from Mathematica to $\LaTeX$ but ...
3
votes
2answers
103 views

How to align the output of MatrixPlot with the output of Plot

I am trying to figure out how to align different types of plots into one image. For example in the following code, it plots two lines on top of a MatrixPlot. I want ...
1
vote
1answer
105 views

Testing a List inside of an Table if it is != 0 [duplicate]

I'm new to mathematica so I hope this is not a too stupid question, but I couldn't find a solution in the mathematica documentation. I've got a normal table, initialized with "0" as entries. In the ...
1
vote
2answers
189 views

Making nice code: choosing one of several procedures

Happy new year mathematica gurus of stack exchange! As I see it one of the major obstacles in getting decent at programming mathematica is that, not only do you need to learn how certain commands ...
1
vote
1answer
158 views

Defining a recursive integral sequence

I have a recursive integral sequence as follows: $$y_0(x)=1+r,$$ $$y_1(x)=-\frac{1}{\Gamma(a)}\int_0^x (x-t)^{a-1} y_0(t) dt,$$ $$\vdots$$ $$y_n(x)=-\frac{1}{\Gamma(a)}\int_0^x (x-t)^{a-1} y_{n-1}(t) ...
2
votes
2answers
160 views

Definitions inside ParallelTable?

How can I make definitions inside ParallelTable to use them outside? For example, if I execute: ...
1
vote
1answer
468 views

Plot in a 2-dimensional simplex

I have a row vector as $P=(p_1,p_2,p_3)$ which should be obtained from the following constraints: $a_1p_1 + a_2p_2 + a_3p_3 = b_1p_1 + b_2p_2 + b_3p_3$ ($a_i$'s and $b_i$'s are known) $p_1 + p_2 + ...
6
votes
1answer
207 views

View the FullForm of ^^

Why am I unable to see the FullForm of ^^ (the shorthand notation for BaseForm)? ...
3
votes
2answers
550 views

How to plot several functions without jumping? (multiple eigenvalues of a system as functions of 2 parameters)

I've been working on this research problem for months with some success by no global/proper solution to the problem. So I have square, Hermitian matrices of various sizes ($8,20,38$ dimensions) with ...
2
votes
1answer
516 views

Histogram with a logarithmic scale for the y-axis

How can I get a histogram with a logarithmic scale only on the the y-axis? With ...
0
votes
2answers
60 views

Function that returns the binary string given its index in lexicographic ordering

Index the binary strings in lexicographic order, so that the empty string " " corresponds to 0, the string "0" corresponds to 1, the string "1" to 2, and so on. I want a function that, given a ...
26
votes
5answers
2k views

How to plot ternary density plots?

How can I get a ternary density plot just like the plots from OriginLab? ContourPlot and DensityPlot seemingly can solve the ...

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