4
votes
5answers
327 views

How to generalize and speed up this program?

There is a vector whose length is $n*m$, we can part it into $n$ sections in order. I want to define a function to compare the $i$-th and $i+1$-th section and find the minimum. The program for $n=m=3$ ...
1
vote
2answers
183 views

Image's pixels GPU colour classes splitting

How can I split in color classes, the pixels of an image that I load in Mathematica? I would an output like this: ...
8
votes
2answers
1k views

How do I find line integrals?

For example, how can I calculate $$\int_{\left | z \right |=1}\frac{dz}{z}$$ I know that the answer is $2\pi i$ but how do I do it using Mathematica?
1
vote
1answer
462 views

How to integrate this cumbersome piece-wise function?

I have this systems of equation: ...
5
votes
2answers
428 views

How to add new nodes to an existing graph with fixed (coordinates) nodes?

I'm ultimately trying to create a directed graph with some of the nodes in fixed positions and the other nodes placed around them in "acceptable" positions. It's better if I ask the question by ...
1
vote
1answer
309 views

ParametricPlot3D and Sphere Graphics

I'm trying to put a sphere into a 3D parametric plot, but I seem to have a strange problem. Here's the code: ...
0
votes
0answers
75 views

Some boundary issue of Integration

When I try to solve the integration f(x) as following (type it in the Mathematica) $ f(x)= \frac{1}{π} \int_{-1}^{1} \frac{\sqrt{1-y^2}}{(y-x)}dy $, I met some boundary problems. I have searched some ...
2
votes
1answer
169 views

RevolutionPlot3D: Inconsistency between Mathematica 8/Linux and Mathematica 9/OSX

The following code runs error-free in Mathematica 8.0 under Linux. ...
2
votes
1answer
91 views

Interaction of InputField with Row (but not Column, Grid or Panel)

In Mathematica 9, there's an interaction between InputField and Row. The following fragment (without or without ...
2
votes
0answers
494 views

Interpolate throughout a 3d data list without extrapolation

I have a 3D list of data for which I'd like to plot an interpolated surface. There are several ways to achieve this, but none I cannot find a method which ONLY plots the ENTIRE interpolated surface ...
1
vote
1answer
84 views

What's the best way to select compatible options? [duplicate]

How do i safely, efficiently, and elegantly select compatible options? I normally do ...
3
votes
2answers
165 views

ParametricPlot3D Question

When I graph: ParametricPlot3D[ If[11*Cos[t] <= 5, {9*Cos[s]*Sin[t], 10*Sin[s]*Sin[t], 11*Cos[t]}, Null], {s, 0, 2*Pi}, {t, 0, Pi}] I get but ...
2
votes
1answer
94 views

Use Mathematica to determine the falling law

We have a one-variable equation $\rho(R)$ where ρ = (14656.4+277.526*R^2)/(45.9225+R^2)^{5/2} + 0.370036/(R*(0.25+R)^3) This equations describes the evolution of ...
5
votes
2answers
350 views

Change character encoding for file read using OpenRead

I have a large bzipped file that I want to read using OpenRead on a pipe with UTF8 encoding. Doing the following does not give me UTF-8 encoding. My ...
1
vote
0answers
47 views

How can I manipulate a circular part of an image? [duplicate]

I want to a specific part of an image, while leaving the rest of the image unchanged: The part should be circular en the center and radius of the circle should be easily adjustable. So far I can only ...
7
votes
1answer
135 views

How does Plot determine vertical range when not user-specified?

Consider the example1: p0 = Plot[Tan[x Pi/2], {x, -1, 1}] In this case, the vertical range specified would be $(-\infty, \infty)$, which is clearly impossible to ...
3
votes
2answers
222 views

How can I track the execution time of an evaluating Manipulate cell?

In Wolfram's tutorial on Advanced Manipulate Functionality, a nice example of a continually evaluating Manipulate cell is presented: ...
3
votes
1answer
127 views

Auto line breaks in workbench

I have been using Mathematica for a while and thought of using Worbench to structure my project better. However, moving my code from .nb-files to .m-files in a Workbench project does not really work, ...
15
votes
2answers
325 views

Automatically close Mathematica

It seems there are a lot of related topics but I haven't found an answer. I want to automatically quit Mathematica after some procedures are done but dialog window appears: ...
8
votes
3answers
198 views

Select and Blank

I try to filter sublists of a list which match a pattern. test = {{"String1", "a"}, {"String2", "b"}, {"String3", "a"}, {"String4", "a"}}; The result should ...
5
votes
3answers
301 views

How can I solve a forward-backward-looking recurrence system?

I would like to (numerically) solve a forward-backward looking recurrence equation in Mathematica. The system is something like: ...
1
vote
1answer
124 views

Function optimization errors

I have the following Mathematica code (Mathematica version 9): ...
5
votes
1answer
406 views

Matrix Rational Canonical Form

Is there a way to calculate the Rational Canonical Form of an $n\times n$ integer matrix using Mathematica? I have been perusing the documentation and web, but nothing so far.
7
votes
5answers
708 views

How to cancel a common term from numerator and denominator?

What mathematica commands are needed to simplify $\frac{x+n x^m}{x(1+x)}$ to $\frac{1+n x^{m-1}}{(1+x)}$ ? ...
3
votes
1answer
118 views

Copy/paste of Interpretation to Latex fails, but works for InputText

As part of another issue, the following has come up. Create an Interpretaion: Interpretation[Subscript[a, b], a[b]] Select ...
2
votes
3answers
419 views

Saturated Density Plots

I am making some density and contour plots in Mathematica. These plots have very high peaks which saturate with color and prevent me from seeing differences in the peaks. Is there a way I can tone ...
6
votes
1answer
537 views

Modelling a Rocket Launch using NDSolve

I'm trying to model a rocket launch with Mathematica but I've run into a little problem since I don't know how to turn the thrust off. I'm using Newton's Law of Universal Gravitation plus an added ...
1
vote
1answer
174 views

BSplinefunction and its derivative

Hi I am trying to use curve fit some data using the BSplinefunction. I havent been using Mathematica long, so my questions might be quite basic. ...
2
votes
1answer
164 views

Add Pattern to List Removing Duplicates

Lets say I have a list of patterns ...
1
vote
1answer
96 views

Symbol not added to context

I have run into a problem that is currently stumping me. I'm running a WebMathematica server, and am trying to create a package to use on one of the pages. However, when I load the package, it appears ...
4
votes
1answer
116 views

“Save as (html)” and still render Input cell code as text?

When I' m testing on this post' s method I found some problems. ...
1
vote
2answers
111 views

Why I cannot use the option “MathOutput”?

I'm on Windows 8.1 with Mathematica 9. ...
4
votes
7answers
381 views

Given a symbolic expression how to find if starts with a minus or not?

I am using a Mathematica function which returns some error term in symbolic form. I needed a way to determine if this term starts with a minus sign or not. There will be only one term This is to ...
5
votes
3answers
266 views

Interpolation steeply drops to 0 beyond data

I use Interpolation on unstructured 3-D-Data to visualize different regions via RegionPlot. A problem I run into is that the interpolating function steeply drops to zero beyond my set of data. This is ...
0
votes
3answers
206 views

Given a Boolean representation of a system, how can the Reliability Function be displayed as symbolic algebra?

Can Mathematica 9 convert a Boolean representation of an RBD to its symbolic algebraic form? If I have a simple series Reliability Block Diagram made up of 2 components, c1 and c2 bexpr1=And[c1,c2] ...
0
votes
0answers
173 views
4
votes
1answer
234 views

Create ParametricFunction object without ParametricNDSolve

Documentation of v9 states that ParametricFunction is generated by ParametricNDSolve and ...
4
votes
4answers
164 views

Robust function for manipulation of nested lists

I have a nested list of the form: ...
0
votes
0answers
334 views

Using Solve Within Manipulate to Model Feedback Control System Problem

This post is extremely long and I do apologize - but please bear with me with all the explanation of the context of the question - due to how long the code is I have included a hyperlink where you can ...
6
votes
2answers
478 views

Displaying index as subscript on output: e.g. C[i] -> C_i with Notation[…] or Interpretation[..]?

You have all convinced me not to type in formulas with subscripts. However, in order to be able to match the subscripts in my whiteboard math, I figure a 2nd best solution is to want to display ...
0
votes
1answer
548 views

Bifurcation diagrams for system of equations

I am interested in constructing a bifurcation diagram for parameter a in the dynamical system given in the code below. I want to see how parameter changes affect the stability of the system. The ...
6
votes
1answer
129 views

Moles/Liters doesn't get simplified to Molar even though Molar*Liters gets simplified to Moles

Why can't Mathematica 9 simplify mol/L to M, when it can simplify M*L to mol? ...
1
vote
0answers
204 views

CUDA* commands are very slow on OS X and Mac

I have Mathematica 8.0.4.0 installed on my new MacBook Pro running OS X 10.8. I also have the latest CUDA drivers (and even the CUDA SDK) from nVIDIA. I've noticed that commands like CUDAQ[] take a ...
4
votes
1answer
136 views

Why are the two shades of the same color in this figure?

Given $S \subseteq \mathbb{C}$ I am trying to plot $f(S)$ for given complex valued function $f$ Looking at other answers on this site for similar questions, I came up with this ...
2
votes
0answers
58 views

Simplifying a quadratic [duplicate]

I have a general query about simplifying expressions in Mathematica, which I will illustrate using quadratics. If I tell Mathematica to simplify $a x^2 + b x + c$ then ...
0
votes
1answer
202 views

Plotting region $f(S)$ for given complex function $f$ and $S \subseteq \mathbb{C}$ [duplicate]

I have a function $f: \mathbb{C} \rightarrow \mathbb{C}$ and I want to be able to see the effect of $f$ on any particular region of $\mathbb{C}$ e.g. what happens to the unit disk under this ...
2
votes
2answers
200 views

Exporting graphics without X server

I have a Mathematica installation on a Linux server that is intended to be used for batch processing. Some of the things that will be processed will include rendering of graphics. However, if I use ...
2
votes
1answer
248 views

Demonstrate aliasing effect in sound

I'm trying to demonstrate the aliasing effect using sound, that is, when the sample rate is fixed and the sound frequency is increased, we would hear the sound pitch go down when we pass the Nyquist ...
0
votes
1answer
100 views

Arbitrary number of variables in Module, Block, etc

How do I specify an arbitrary number of variable names and initialize them inside of a Module or Block? For example, I want to do something like: ...
2
votes
2answers
360 views

About Argument of complex numbers

Suppose my z = x + iy Now, if y=0, then z = x i.e it becomes a real number So, logically ...

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