0
votes
2answers
276 views

How can I give graph required data with GUI?

Consider that I have the simple graph of ...
0
votes
1answer
999 views

financial data behind Wolfram|Alpha and Finance Platform

I need to price 23,000 securities from 1999 to 2007, and they are surprisingly hard to find on subscription-based services, like Bloomberg LP, ThomsonReuters or S&P CapitalIQ offerings. Probably ...
20
votes
2answers
1k views

3D orbits and inaccuracy over time

I wrote a little program to use Newton's Law of Universal Gravitation to animate 3 planets orbiting a central star, but I have run into a problem. Here is the code that I used to create the program (I ...
5
votes
1answer
2k views

How to draw some 2D curves in a 3D plot? [duplicate]

I want to plot several 2D curves (Sin[x] at y=0, Cos[x] at ...
12
votes
2answers
783 views

DumpSave for the forgetful

A few weeks ago I created a big matrix, and in order not to have to recreate it, I stored it using DumpSave["file.mx", variable]. Now I want to read it back in and ...
1
vote
1answer
558 views

Prandtl-Meyer function

I'm trying to solve for Mach number based on the given Prandtl-Meyer function, however I keep getting odd error. Here is my code: ...
2
votes
2answers
445 views

Mass Symbolic Manipulation with Subscripts? (from plaintext Input)

The simplest example of the change being sought is a greek letter, typed in as plaintext nu, and its may be replaced by the symbol, ν: expr = 3nu*kx*ky+ ...
7
votes
2answers
500 views

Convert Graph to Graphics

In Mathematica 9, a graph is returned as an object with head Graph: In[8]:= CompleteGraph[8] // Head Out[8]= Graph ...
1
vote
1answer
218 views
1
vote
0answers
72 views

Unable to copy/paste CDF embed code in Ubuntu

I tried this question in superuser but no luck, maybe somebody here knows what is going on... Mathematica offers export to a format they call Computed Document Format (CDF) - it is basically a player ...
3
votes
1answer
550 views

How to adjust parameters to experimental data on a NDSolve problem

I have 2 differential equations with 2 variables, x and y,which are a function of t and I have the parameters k1, k2 y k3. ...
5
votes
2answers
271 views

Simulating a Stochastic Process within certain bounds

I would like to simulate paths of a Geometric Brownian Motion till it hits one of two barriers, say 10 or 200. ...
1
vote
1answer
174 views

How to send a function definition to MathLink from C/C++?

In this tutorial some MathLink concepts are introduced. At page 33 in the last lines the author is talking about sending to MathLink a function definition like ...
7
votes
6answers
3k views

How do I draw a hemisphere?

I want to draw a solid or partially transparent hemisphere above a partially transparent cuboid object in Graphics3D. However, I do not know how to do this s.t. only half the sphere is drawn. Here's ...
4
votes
2answers
419 views

Cannot call custom function loaded from script using C/C++ MathLink

I am using MathLink with C/C++ on a Unix system in order to call a Mathematica (version 9) function and get the result. The function I need to call is a personal function of mine ...
5
votes
1answer
182 views
1
vote
2answers
274 views

Problem in reading data from a text file with two variables

I want to read in a data file, test.txt, in Mathematica. The file has the following content: ...
5
votes
3answers
507 views

Find the position of a string element, knowing only part of the string

I have a list, e.g.: list = {1, 2, 3, "Element 1", 4, 5, "Element 2", "Something else 1", "etcetera"} Now, I want all elements starting with ...
3
votes
1answer
125 views

Optimizing a simple calculus using a list of matrices - Repeated dot product between a vector and a list of matrices [closed]

I want to make the following operation : $$ \begin{bmatrix} \dot q_1\\\dot q_2 \end{bmatrix} + \begin{bmatrix} \begin{bmatrix} q_1 & q_2 \end{bmatrix} \mathbf A_1 \begin{bmatrix} q_1\\ q_2 ...
6
votes
2answers
457 views

Exporting twice crashes Mathematica on Ubuntu 12.04 with Unity

I'm trying to work out if it's a Mathematica, Ubuntu or setup specific bug. I've asked some colleagues to try it on other Linuxes. This also crashes on OS X with Mathematica 8.0 and fails with 9.0, ...
2
votes
2answers
947 views

How can I get even steps on x and y axes in a plot?

I'm plotting the shortest distance from a point to a line using the following code ...
88
votes
7answers
4k views

Can one identify the design patterns of Mathematica?

... or are they unnecessary in such a high-level language? I've been thinking about programming style, coding standards and the like quite a bit lately, the result of my current work on a mixed ...
2
votes
0answers
545 views

I can't solve this set of equations

I am having trouble solving a set of equations in mathematica. I do not get any errors, but i don't get any answers as well. I have some restrictions on my parameters and variables in the equations ...
1
vote
3answers
1k views

Changing FrameTicks of ListPlot

I am unable to change the frameticks for my list plot. I am trying to plot a growth rate omega function which looks like this: ...
3
votes
1answer
125 views

Comparing data sets with fade transitions (Code speed-up)

I am using the utility below for data comparison. However, with my real (more complex) charts the processing is quite slow, so setting the Pause time under ...
6
votes
1answer
118 views

How does `LongestCommonSubsequence` work?

When I recently came across this posting about LongestCommonSubsequence I was curious about how the function worked. ...
1
vote
3answers
204 views

finding an argument of a complex number

What is the simplest way to find the argument of the following function? ((1 - E^((I π (1 - α))/(β - α)) z)/(1 - E^(-((I π (1 - α))/(β - α))) z)) as I tried the ...
1
vote
1answer
141 views

Another MoebiusMu question

When I evaluate the Mertens function to infinity: NSum[MoebiusMu[k], {k, 1, \[Infinity]}] I get -1, but I expected to get -2. I wanted to modify the ...
0
votes
4answers
1k views

How can I make a Plot over a discrete set of domain points?

I want to plot the function $y=2^x$ at the $x$-values given by Table[Prime[n], {n,20}] How should I write the plot function? Like so? ...
15
votes
3answers
692 views

How can I create a 3D FilledCurve object?

FilledCurve can create a 2D graphics object; for example: ...
15
votes
2answers
293 views

What are Root objects with multiple polynomials?

In Mathematica 9 a new flavor of Root object with multiple polynomials was introduced. For example, ...
3
votes
4answers
384 views

another way to do this mapping of a two argument function

Sorry, I'm just starting to learn mathematica. I have the following two-argument function: h[{x_, y_}] := x ^ y When I do the following: ...
4
votes
4answers
584 views

Remove linear trend from data

I have a large data set with 150k lines and two data columns. I noticed that there is a linear trend, which I want to remove. So, I do the following: first fit with a linear model ...
4
votes
2answers
548 views

Linear regression in a chosen range of points

Hi I'm absolutely newbie in Mathematica and have following problem: My list looks like {{50, 0.75}, {51, 0.76}, ..., and I want to choose a range out of my ...
2
votes
2answers
270 views

Why do Plot and ListPlot use the last PlotStyle when only one thing is plotted?

When a list of PlotStyles is given, ListPlot behaves as expected when there are multiple things to plot: ...
3
votes
1answer
382 views

on RegionPlot3D and ContourPlot3D

First I have ...
5
votes
2answers
132 views

RSolve gives a Context::ssle error

I want to solve the following recurrence equation RSolve[{(k + 2) c[k + 2] q^(k + 1) - c[k] == 0}, c[k], k] During calculation in Mathematica I get this ...
6
votes
0answers
111 views

ShowSelection color

The color of a selection is controlled by the operating system. E.g., enter the following code in separate cells. ...
9
votes
1answer
134 views

Is it possible to make v9 ignore case when completing names?

In v8, I could type, say, fulls or texf to get FullSimplify or ...
9
votes
0answers
648 views

Numerically solve 2nd order differential equation with singularity

Consider a second order differential equation with a potential that diverges at some generic value in the variable. For example: $$-y^{\prime\prime}(s)+\frac1{\mathrm{cn}{(s\mid k^2)}}y(s)=0$$ where ...
1
vote
1answer
142 views

Conditionals slower than operators?

I want to make my application faster. I tried to replace an If condition with operators. The If condition is ...
1
vote
1answer
249 views

Mismatch between Axes -> True and Frame ->True

Using Axes -> True of the following........ ...
15
votes
6answers
2k views

How to find major color in a picture?

I want to find the major color (the color which appears most often) in a picture and do some analysis later. For example, if I have this picture: What I want to do is find out that gray, red, ...
1
vote
1answer
230 views

Output precision

I've solved some equations using FindRoot and then computed some values. Now when I print the output, I only get a certain precision {{0.01, 496.983, 61.3147, ...
10
votes
1answer
136 views

How do I expand StirlingS2[n, 10] in terms of elementary functions?

I know that it is possible to expand StirlingS2[n, 10] in terms of elementary functions of n. I tried ...
0
votes
1answer
155 views

Outputting a set of graphics 3D objects with positions defined by one array and colors by another? [duplicate]

I have a set of 2- or 3-space coordinates in an array, $(v_1,...,v_N)$, and an array of RGB color values (outputs from ImageValue[]) for each coordinate, $(c_1,...,c_N)$. How can I output a ...
3
votes
1answer
975 views

Detection of horizontal lines in an image

Ok I'm trying to detect horizontal lines in an image. But the problem is that the line is quite obscure. So I'm not sure if it is even possible to extract that. I tried many different filters, but ...
2
votes
0answers
111 views

Prevent Suppression of Superscript 1 in Print

I'm trying to print Christoffel symbols of the second kind for a surface in $\mathbb R^3$. I currently am using something along the lines of ...
3
votes
1answer
240 views

What causes strange line artifacts to appear in plots with certain PlotRanges?

I have seen this strange plotting artifact occur before and I was able to make it go away by changing the PlotRange. However, this time I need the prescribed PlotRange to be what I define and I get a ...
5
votes
3answers
984 views

Solve for the intersection point of 3 surfaces

Basically, I have three 2-torus (tilted) in 3-dimensional Euclidean space. They are expressed by parametric equations: ...

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