5
votes
1answer
819 views

Solve system of ordinary differential equations that doesn't have an initial condition (t=0), but has an inifinity condition (t=infinity)?

I have a question for solving t -> Infinity on Mathematica. First, I have a system of ODEs: ...
5
votes
6answers
358 views

How to change specific values in a List [duplicate]

In a list lst I want to change all values > 255 to 255. Why is this code not working? ...
5
votes
2answers
196 views

Delete contexts from a string representation of a symbol

I want to delete the string representing the context of a symbol. For info I need such a functionality in my ShowIt function defined here I'd like to know how I ...
5
votes
3answers
1k views

How to use results of NDsolve[] for further solving of ODEs?

I have a system of ODEs with 10 eqns. I can solve the first 5 independently. How can I use those results to solve for the remaining 5? An easy example would be $\dot{x}=f(x), \quad \dot{y}=g(x,y)$ ...
5
votes
1answer
965 views

When do I use Mathematica, when do I use Gephi, and how do I use them together?

Mathematica has great operations for analyzing graphs but when the graphs are a bit bigger, Gephi seems to be more efficient (at least on my computer) at drawing and analyzing, i.e. visualizing the ...
5
votes
2answers
367 views

What alternative notation of subscripts/superscripts that are also treated as SYMBOLS in Mathematica?

I tried to avoid using the subscript $A_0$ in the Module, and get an error with $A[0]$. ...
4
votes
1answer
56 views

How to create a CDF “on the fly”?

I don't know if I have asked the question the right way: As CDF is essentially a simple text file, I would like to create it "on the fly" without saving it to the hard drive. I would like to give a ...
4
votes
1answer
132 views

Construct a function that can generate a geometry by extruding a section

Toady I want to construct a geometry shown as below: I know the Mathematica has the functions like Cylinder, Sphere and so ...
4
votes
4answers
309 views

An easier way to find the properties of an ellipse from its equation?

In this Q&A about fitting an ellipse to a set of points, there are multiple answers that generated general equations of the ellipse, like this one by @ubpdqn: However, the steps to find out the ...
4
votes
1answer
205 views

Point style in ListPointPlot3D

In ListPointPlot3D, it seems the only point style available is the default, because there is no PlotMarkers option for this ...
4
votes
1answer
115 views

NDSolve - sampling for result during the computation

I am using NDSolve for a Langevin dynamics problem. I want to the know long term behaviour of my system ($t>1$) but it has to be simulated with very small time steps ($dt\sim 10^{-9}$). An example ...
4
votes
2answers
69 views

How can I make a stylesheet where inline cells have are styled like input cells?

How can I make a stylesheet where inline cells have are styled like input cells? By "similar", I mean the same font and syntax highlighting. I have even tried copying all settings from ...
4
votes
2answers
118 views

Clicking to add/remove a Locator

I would like to add a Locator to a figure displayed by Manipulate when I click inside the figure, at the location where I click, ...
4
votes
3answers
218 views

Notation package: parenthesis placement for SuperscriptBox

The question concerns the Notation package. I want to define notation for the function very similar to the built-in Power[a,b] ...
4
votes
1answer
349 views

How to implement Kemeny-Young method? (rank aggregation problem)

Prehistory I am trying to make some statistical analysis of some experimental data, arises from measurements made ​​on an ordinal scale. I faced with the problem of rank aggregation: to get from ...
4
votes
2answers
160 views

Grid ItemSize is smaller than expected

If I execute MatrixPlot@IdentityMatrix@100, the result is a good size. However, if I evaluate ...
4
votes
1answer
206 views

Setting a Counter in Mathematica Notebook

I would like to write a book using Mathematica, but I will write one chapter on several files. How to tell Mathematica that the BookChapterNumber pointer has the ...
4
votes
3answers
253 views

make specific cluster

I have set of coordinates. I want to make clusters in which every point is within 1.5 distance unit of it's neighbor. ex of point coordinates: ...
4
votes
1answer
540 views

Plotting a 2D shape along a 3D parametric function curve

Say I have a 3D curve that is parametrically defined. How would I be able to plot shapes like figure 8s whose centers are aligned along the 3D curve? Say the curve was: ...
4
votes
2answers
366 views

Numeric calculation of Hessian

I want to calculate the Hessian matrix for a function that can only be evaluated numerically. So far, I have the following (where f is just for testing): ...
4
votes
1answer
132 views

How to transform a DumpSaved .mx file to .m file conveniently?

I have many DumpSave-d .mx files under a directory. They are generated under Linux. The .mx ...
4
votes
2answers
227 views

Modified Cell Different Display

Is there a way to show maybe a slightly different color, or change the cell bracketing color of a Mathematica cell when it has been modified? Ideally it would be nice to follow the standard of ...
4
votes
1answer
218 views

Dynamic legends involving show

My question is how do I get dynamic legends (legends that turn data on/off) to work with Show? This is an extension of an old question here; How to dynamically toggle curves on/off in a crowded ...
4
votes
1answer
174 views

Where will I put packages?

Recently,I got WebMathematica. Initially I searched WebMathematica documentation in Mathematica documentation, but it doesn't return any results. For this I read tutorials; finally I placed the ...
4
votes
2answers
319 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 ...
4
votes
1answer
189 views

Manipulate a Plot that contains a variable that contains symbol [duplicate]

This snippet mm = m Manipulate[{mm, Plot[mm x, {x, 0, 1}]}, {m, 0, 1}] (m is not defined anywhere) produces a sadly fixed ...
4
votes
2answers
484 views

Transparent Cylinder with Dashed Edges only

I would like to have that kind of cylinder with Dashed edges (including the bellow inner ring): I've been trying that: ...
4
votes
1answer
100 views

How to substitute $x$ in a expression $f(x)$ but not calculate the value of the $f(x)$ at the point $x$?

I want to subtitute $x = 1$ into the expression $$f(x)=x^2 + 3 (x^2 - m^2) + \sqrt{x^2 + 1}$$ but I don't calculate the value $f(1)$, that is mean, I want $$1^2 + 3(1^2-m^2)+\sqrt{1^2 + 1}.$$ If I ...
4
votes
1answer
385 views

Exporting Mathematica expression as SVG

I was thinking it would be nice if I could export Mathematica expressions as svg, but I am having some issues. At first blush everything seems to work fine. This piece of code does produce a svg file: ...
4
votes
2answers
903 views

How to fix BodePlot that comes with Mathematica?

I am using Mathematica to go through the examples and exercises on the book Modern Control Systems, 6th edition by Dorf. On page 605, there is a table (Table 8.5) with the Bode plot for several ...
4
votes
1answer
188 views

Dynamically link cell content in Mathematica?

Is it possible to dynamically link the content of two cells? For example, can I set up a Notebook with two text cells that display the same value, and if the user types in one the other updates, etc.? ...
4
votes
3answers
264 views

Extracting Pareto elements from a list

How can I extract the Pareto elements from a list? For example, for that list: ...
4
votes
2answers
625 views

Define a color function based on color samples obtained from ColorBrewer

I am quite new to mathematica and I am searching for a way to create a smooth colormap based on the samples given by http://colorbrewer2.org/ . Is it possible to create a interpolated function from ...
4
votes
2answers
5k views

How do I solve coupled ordinary differential equations?

I have four coupled ODE's. I am not sure how to plot and solve them using Mathematica. I won't give the exact problem, but the following is something analogous: The equations ...
4
votes
2answers
343 views

Custom (physics) dictionary for mathematica (used for word-processing, spell checking)

Is there a dictonary available that contains physics slang like spinor, vacua, gauge etc.?? How would one integrate such a file (or a simple text file containing the words) into the front-end without ...
4
votes
1answer
1k views

How to run a Mathematica program using command line on windows?

I have to run some Mathematica programs on a remote computer. The system of that computer is Windows XP. But I do not know how to run the program using command line on windows. Can you help me? Thank ...
4
votes
3answers
2k views

How can I plot the complex graph of $x^x$ in Mathematica?

For example, this Wolfram Alpha query shows this graph: But it does not show the code for plotting it in Mathematica. Plot[x^x, {x, -1, 1}] only plots the real ...
4
votes
1answer
367 views

Multiple simultaneous events in EventLocator method for NDSolve

I'm using NDSolve to integrate a system of ODEs, and EventLocator to stop the integration when it leaves a certain region in phase space. This works perfectly as it should. However, I've also added ...
4
votes
1answer
608 views

Removing clipping masks from exported PDFs

I usually export graphics from Mathematica as PDFs which I tweak with Adobe Illustrator. When most plots are exported from Mathematica as PDFs they contain a large number of mostly useless clipping ...
4
votes
1answer
119 views

How do I force columns in a Grid to be equally spaced?

Suppose that I have this table tab, which I display using Grid. Is it possible to force the columns to be equally spaced? All ...
4
votes
1answer
195 views

Programmatically opening a palette from the Palettes menu

How can I programmatically open a palette from the Palettes menu? Is there a Front End token for this? Motivation: Certain settings for the palettes that are installed into standard locations and ...
4
votes
2answers
647 views

A dot appearing after a zero, and making the entries of a matrix into fractions

For more info about the difference between 0. and 0 I am a self-taught Mathematica user and I have some elementary questions-- perhaps too elementary for this site, but here they are. If ...
4
votes
1answer
128 views

How to speed up mouse events?

Grids of dynamic objects responding to mouseovers seem to be quite slow in general, for instance: ...
4
votes
3answers
733 views

Replace function and its derivatives found with Solve

If I have an equation eq = f[x] + g[x] == 0 and I solve for f[x] sol = Solve[eq,f[x]] ...
4
votes
1answer
289 views

Running a package automatically when it's saved

When developing some new code (eg. a function to analyse something) I usually make a .m and .nb file. The code goes in to .m is then called from the .nb. But sometimes I forget to run the package ...
4
votes
3answers
308 views

How to cancel floating point factors?

I am currently having problems with some floating points. I have a function, which gives as an intermediate result (for example) ...
4
votes
2answers
257 views

How to close the front end so I can clear all Global variables?

I first thought that doing Quit[] in a cell, or Evaluation->Quit kernel, is supposed to remove all Global variables, but I have a case where this is not happening, then I read that there is a command ...
3
votes
1answer
74 views

Import iTunes xml data and convert it into a dataset or table

I have an xml file with song data from iTunes (https://dl.dropboxusercontent.com/u/1012958/iTunes%20Library.xml) and I'd like to import it to Mathematica to do some statistics. I get an XMLObject like ...
3
votes
2answers
147 views

Problem with Poincare section

these are equations for some double oscillators: $x'(t)=p, p'(t)=-x-3y, y'(t)=q, q'(t)=-y-3x$ I would like to plot the Poincare section for collection of $(y,q)$ when $x=0$ and $x'(t)>0$ (or for ...
3
votes
1answer
93 views

Custom operators; custom pattern matching with pure functions

What I'm trying to achieve in Mathematica is the creation of a binary operator whose operands are both pure functions over the natural numbers. The result of the operator should be another pure ...

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