All Questions

0
votes
1answer
124 views

Plotting results of numerical differential equation

I'm numerically solving the ODE equation $a = -kv$, i.e. $ x'' = -kx'$. sol = NDSolve[{y''[x] + 0.1 * y'[x] == 0, y[0] == 0, y'[0] == 10}, y, {x, 0, 100}] I need ...
0
votes
1answer
281 views

Bit Operations — Force Binary Bit Representation

How to force binary bit representation of a number, so BitNot does yield the 1s-complement? BitNot[n] turns ones into zeros and vice versa in the binary bit representation of n. I was unable so ...
5
votes
2answers
164 views

How to present a Graphic and a Table in close proximity to each other

Often, with a Plot or within Manipulate I want to display a graph and, in close proximity to it, a table showing the results of ...
1
vote
1answer
159 views

How do you multiply out integer powers in a symbolic expression?

I have the following problem: I want to transform integer powers into a series of multiplications within symbolic expressions. E.g. x^3 should be written as ...
2
votes
1answer
142 views

How to evaluate the sum over a hyperplane

I have difficulties in evaluating the following expression: $$\sum_{\small n_1+...+n_{k}=m-k}\; \prod_{i=1}^{k}\frac{1}{(n_i+1)(n_i+2)}$$ I have tried the function ...
7
votes
2answers
372 views

Bitwise operators - Hamlet for Mathematica

What is the best way to check this famous equation: 0x2b || ~0x2b == 0xff Mathematica doesn't seem to have a handy bitwise negation operator. The best thing I ...
5
votes
1answer
221 views

Override @ to mock Java Classes

This question appears impossibly long so apologies in advance (skip to the bottom if you want to see the actual questions). I want to be able to mock Java Classes in Mathematica code. For example, I ...
33
votes
1answer
1k views

Mathematica 9 cannot solve this Integral. Mathematica 8 could. Is this a bug?

I was trying to (re)calculate a problem of an older Wolfram blog post (Problem 11457, by M. L. Glasser) with Mathematica 9.0.0.0 (on OS X 10.8.2). ...
2
votes
2answers
209 views

How can I shift the frame ticks to the corner of each element-cell in a Matrixplot?

I am using the following code,to create a Legend for my plot. I would like to shift (or re-position) the frameticks to the corner of each of the cell-elements instead of being in their middle. I ...
0
votes
1answer
482 views

Array of functions, evaluation in plot

I would like to create two arrays of functions yfunc[[i]] and tfunc[[i]], with each entry of those functions being a function ...
20
votes
1answer
524 views

How can we create Randolph diagrams in Mathematica?

I have become fascinated with Randolph Diagrams and was wondering how we would create the diagrams from logical sequences using Mathematica? It looks like it would be a combination of logic and ...
7
votes
2answers
1k views

Game theory packages

Is there any game theory package around? I mean supporting functions which take a game in matrix form and tell you all about nash equilibra, best strategies, ect
4
votes
2answers
235 views

Pattern matching repeated structures with named subexpression components

I am trying to write a function with a pattern that tests its arguments for a particular structure. But in that pattern I'd like to name a subpattern to make it easier to exract and operate on. The ...
18
votes
4answers
766 views

How to efficiently import videos

I need to do frame-by-frame analysis of videos. I can import the video files I need, but each file is too large to import at once. I can use the ...
5
votes
3answers
360 views

Interpolation with boundary conditions

I'm working on a sales projection, trying to create some flexibility in handle the forecast using locators. The toy code is something like this: ...
4
votes
3answers
1k views

Definite integral takes a very long time

I'm trying to integrate the following function: $$ r_e=\int_0^z\frac{dz}{\sqrt{\Omega_m(1+z)^3+\Omega_\Lambda}} $$ where $\Omega_\Lambda=1-\Omega_M$ and both $\Omega_\Lambda$ and $\Omega_M$ are real ...
9
votes
2answers
378 views

LF line break instead of CR+LF when exporting text files on Windows

I want my program to always save a text file with unix-style LF line breaks (even when Mathematica runs on Windows). But the way the built-in ...
10
votes
2answers
221 views

Difference between action of a Slider and a HorizontalGauge

First time posting. I am working on creating some interactive materials for the engineering classes that I teach and have run into an issue that I cannot puzzle out. I am using a slider to allow for a ...
-4
votes
2answers
280 views

Calculate one-tailed critical point from a probability distribution

I would like to calculate the numerical value of $\xi\in\mathbb{R}_{\geq0}$$$P(|U|<\xi)=0.95$$ where $U$ is standard-normal distributed. How may I do that in Mathematica?
8
votes
3answers
739 views

plotting a {{Latitude,Longitude}} list on top of a GIS shapefile

I have a dataset composed of points specified in {Latitude,Longitude} format. Call it latlong for the purposes of this question. It displays properly with ...
1
vote
0answers
119 views

Mathematica and Python integration? [duplicate]

Possible Duplicate: Is there a way to run Python from within Mathematica? I do see the latest version has R-link: http://www.wolfram.co.uk/mathematica/new-in-9/built-in-integration-with-r/ ...
27
votes
2answers
748 views

DeleteDuplicates not deleting duplicates

It is not surprising that DeleteDuplicates[{5,5.}] returns {5,5.} because DeleteDuplicates ...
10
votes
1answer
632 views

NDSolve Differential Equation Error

I am trying to solve the following differential equation- ...
3
votes
1answer
208 views

Font Issues: “Like Resource 58” error

I'm running Mathematica 9.0.0 on a Macbook Air with OSX 10.6.8 and I've recently started having issues with the font in the program. All special characters are being replaced with other characters in ...
5
votes
1answer
557 views

How to start simulating physical problems?

I'm quite new to Mathematica, I have version 9. I need to use it to simulate some physical problems. I know the equations (like Maxwell's equations and Newton's laws and so on), but I have no real ...
5
votes
4answers
253 views

Can the general term my recurrence equations be written with Floor or Mod?

I want to know the formula for the general term of the following recurrence system. I guess it can be written with Floor or Mod. ...
2
votes
1answer
2k views

Forcing FindRoot to return only real solutions

FindRoot documentation reports that if the equation and the initial point are reals, the solutions are searched in the real domain. However, in the following case I ...
8
votes
1answer
115 views

How to catch the “Preemptive” evaluations from within the main loop?

When trying to make an optimized version of my plotRange fonction I faced a problem of catching the "Preemptive" evaluations ...
0
votes
2answers
583 views

Assign the output of a loop [duplicate]

Possible Duplicate: Creating a table/Matrix during a For loop Yet another simple question. ...
7
votes
7answers
588 views

Can my color function be written more simply?

The code shown below works well, but I think the pure function I'm supplying to the ColorFunction option could be more elegant. How can I simplify it? ...
0
votes
0answers
70 views

Trying to access element of a matrix [duplicate]

Possible Duplicate: Question about MapThread and Dynamic I'm trying to extract element of a matrix. Let's suppose that the matrix is ...
3
votes
2answers
329 views

Dynamic matrix multiplication

I have the following problem: I want to multiply two matrices and sum them to another matrix C. A.B+ 2B Easy! The matrix A varies as a function of three inputs a,b and c. The second matrix, B, is a ...
7
votes
1answer
80 views

Aborting from inside a Dialog

Suppose I got in a Dialog and wanted to not Return but Abort the computation. How could I do ...
6
votes
1answer
93 views

Is it safe to use older version subkernels with a newer version main kernel?

At the moment we only have access to version 8 of the Lightweight Grid (i.e. version 8 of the Mathematica kernel). Is it safe to run version 8 subkernels together with a version 9 main kernel? It ...
7
votes
1answer
276 views

1D Random Walk with Excluded Sites and Variable Time-Step

Here is the physical problem I would like to simulate: Consider the following variations to the 1d random walk: allow for certain, random sites to be excluded with probability 1/2. allow for the ...
3
votes
1answer
69 views

local logfiles for remote kernels

I'd like remote slave kernels to produce log files on my local machine, subject to the following constraints: 1) I don't want to install a distributed filesystem or do other administrative work on ...
3
votes
2answers
196 views

How to remove border points from InputForm?

I have this code, and it generates the below ListStreamPlot. The second graph is the ListStreamPlot overlaid with the points ...
1
vote
2answers
434 views

Plotting Inverse Functions using ParametricPlot gives error message [duplicate]

Possible Duplicate: Plotting multivariable integration I am trying to plot an inverse function. If I do something like this: ...
16
votes
2answers
1k views

How to translate interactive graphics from Mathematica to standard HTML+SVG?

I have a simple interactive plot in Mathematica, with controls for various parameters. The point the plot is simply that, by manipulating these controls users can explore how the plot changes as the ...
3
votes
2answers
288 views

integral, explicit form

I want to estimate the ratio of integrals: $$ \frac{\int \frac{4 a T^3}{\frac{4 a T^4}{3}+\Lambda_1 \left(\frac{4}{T^3}+1\right)}}{\int \frac{4 a T^3}{\frac{4 a T^4}{3}+\Lambda_0 ...
6
votes
1answer
254 views

What algorithm does Plot use to determine abscissas?

(I'm hoping this question is not hopelessly naive...) My understanding is that Plot's strategy is to generate a list of abscissas, evaluate the argument expression ...
1
vote
2answers
630 views

Derivative of a spline approximation

To approximate an experimental data function $f(t)$ with $t \in (t_{min},t_{max})$ I used a cubic spline $s(p)=(t(p),f(p))$ with the parameter $p \in (0,1)$ and $p = t/(t_{max}-t_{min})$ by using the ...
-1
votes
1answer
249 views

Why does the PlotStyle not apply globaly when I plot multiple data files

I have several data files which contain columns of data. All my files follow the same format data001.out, data002.out, ... , data00n.out. I want to import and plot all of them simultaneously. In ...
4
votes
1answer
181 views

Why does Assuming for Integrate not work as expected?

I'm trying to perform the following integral with Mathematica 7: ...
20
votes
1answer
381 views

What is PointForm?

I stumbled across a function called PointForm but the only documentation I can find is the pop-up line offered by autocomplete, which contains the same information ...
2
votes
0answers
171 views

About calculating Integrals

I am trying to Integrate the following Integral (all of the variables are reals) $$\int Exp(-(\cos^{-1}\left[\frac{\text{n}_0 (\text{v}_0-\text{x}_0)+\text{n}_1 (\text{v}_1-\text{x}_1)+\text{n}_2 (u ...
21
votes
4answers
809 views

An apparently “simple” limit?

Let $c$ and $h$ be real values. I was using Mathematica to compute the limit $(h \rightarrow \infty)$ of the following expression: $$ \frac{\left(h^2 +c^2 h^2 + \sqrt{4 h^2+\left(h^2+c^2 ...
5
votes
1answer
303 views

Simplification of double symbolic sums containing a DiscreteDelta without explicit summation range

I am trying to get Mathematica to automatically do simplifications like the following: $$\sum\limits_{q}^{q\in qV}\sum\limits_{q'}^{q'\in q'V}{f(q)g(q')\delta(q-q')}=\sum_{q}^{q\in qV}{f(q)g(q)}.$$ ...
2
votes
3answers
264 views

How to Dynamically Locate (get coordinates) of a point, inside a Manipulate?

I've been searching all around the "Documentation Center" and other forums and just can't get to solve this issue. I'd like to dynamically locate a point (get it's coordinates) inside a Manipulate. ...
6
votes
1answer
252 views

How to create a large sparse block matrix

I need to generate a very large sparse block matrix, with blocks consisting only of ones along the diagonal. I have tried several ways of doing this, but I seem to always run out of memory. The ...

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