3
votes
1answer
446 views

Issues with ColorFunction Scaling when using RegionFunction in VectorPlot

I was plotting a VectorPlot and restricting it to the physically meaningful region using RegionFunction. To my surprise, the ...
0
votes
1answer
356 views

Solving a system of equations using subscripted variables

I want to solve this equation: X(i, j) + C*Y(i, j) = Z(i, j) Where ...
5
votes
2answers
142 views

Trouble with Replacements [duplicate]

I have the following line of code: Plus @@ Table[p[x], {x, 0, 20}] /. p[x_] -> Boole[MemberQ[{0, 5}, x]] The first part of this produces ...
5
votes
1answer
817 views

How can I efficiently write formatted data to a Gaussian Cube file?

I am working with data files that contain information about electronic wave functions. The data format is specified by the quantum chemistry program Gaussian. I need to import the data, manipulate ...
10
votes
4answers
2k views

Problem with ContourPlot

I tried these ...
3
votes
1answer
381 views

Including two ListLinePlots in a 3D graphic

I have two lists of data which I am plotting on two ListLinePlots. I would like to have these two plots appear perpendicular to each other on a 3D graphic. I have ...
6
votes
1answer
193 views

RSolve[{y[0] == y0, y[t + 1] == (1 - (t + 1)/100) y[t]}, y[t], t]

When I evaluate this code: RSolve[{y[0] == y0, y[t + 1] == (1 - (t + 1)/100) y[t]}, y[t], t] I get an RSolve::bvnul error. I don't understand why. Yet, if I ...
5
votes
2answers
196 views

Why does Integrate return a solution that is not defined at a particular point when it actually is well defined at that point?

I am trying to compute Integrate[Sqrt[x^4 + (y - y^2)^2], {x, 0, y}] Mathematica 8 gives ...
21
votes
3answers
1k views

How to program a F::argx message?

How useful is it to program a user-built function in a package to produce a red warning message F::argx if you give the wrong number of arguments to that function? ...
4
votes
1answer
486 views

substitution rules for Penrose tiles

This page on W|A shows a nice substitution rule to draw kites and darts. I'd like to implement the rule in Mathematica, so I've drawn the original kite and its replacement (separately). I've also ...
2
votes
1answer
200 views

diff-able text-only notebooks?

I would like to save my Mathematica notebooks as plain-text documents, so that I can keep them under git version control. I thought that ...
7
votes
2answers
123 views

How can I recover a graph from a graphical output in a notebook after resetting the kernel?

I have an old Mathematica notebook with an output for a graph structure $G$ I would like to recover. However, the routine for building up the graph is stochastic, so I can't simply rerun the code. ...
1
vote
1answer
104 views

given n lists, get list of applications of function to n-tuples

Is there a built in function or an easy rule to do the following transformation? H[{A[0], A[1], ...},{B[0], B[1], ...},...] into ...
0
votes
3answers
665 views

Assume function is real valued

I want to create a function returning subscripted symbols and I want these symbols to be assumed real. How do I do that? ...
0
votes
2answers
843 views

Do/For loop for plots

I have a lot of points that I would like to get shown on a plot. The problem is that sometimes I only have 2 points while other times i have 10 points. I've tried to make a for loop to create a plot ...
5
votes
1answer
157 views

How to apply tags to expression terms?

I often see on this site and at the mathgroup the repeated questions on how to rearrange expression that Mathematica "likes" to keep in one form, but the user prefers in another. Consider this trivial ...
7
votes
1answer
273 views

Making FindShortestPath a little bit sloppy [duplicate]

I have a dense graph, and I'd like to find multiple "almost shortest" paths from a source vertex, $v_s$, to a sink vertex, $v_s$, on an undirected graph $G$. How can I repeatedly run ...
1
vote
0answers
885 views

How can I speed up numerical integration of multidimensional integral?

I am numerically solving an integral equation that contains a double integral. I have managed to get a solution but it takes forever. I am wondering if there is a way to speed up numerical integration ...
14
votes
1answer
782 views

Simulating discrete time stochastic dynamic systems

What is the canonical way of simulating discrete time stochastic dynamical systems in Mathematica using the new functionality of Random processes? To take a concrete example, lets consider the ...
2
votes
2answers
320 views

integrating slightly complicated expression which includes Abs

I have been waiting for Mathematica to give me something for the following integral, errors welcome, but it has been "running" for almost 30 minutes now. ...
6
votes
2answers
372 views

Why is CityData[All, “Coordinates”] failing?

When I evaluate CityData[All, "Coordinates"] Mathematica returns {Missing["NotAvailable"], Missing["NotAvailable"]} ...
0
votes
2answers
151 views

Symbolic evaluation fails because it exceeds $RecursionLimit

I am trying to perform a simple arithmetic in complex algebra. ...
1
vote
1answer
1k views

Plotting a complex function [duplicate]

What does it mean if this message appears: {Im[(1-E^Times[<<3>>] f)/(1-Power[<<2>>] f)]-0,Im[(1-E^Times[<<3>>] f)/(1-Power[<<2>>] f)]-0} must be a list of equalities or ...
7
votes
1answer
4k views

How do I display a histogram with normalized counts?

I have some data corresponding to real number distances: {200.04053, 200.232123, 156.3242,...}, and I would like to bin these values and display them as a histogram ...
4
votes
1answer
212 views

Is there a fast way to trilaterate a point?

I have a point in 2D or 3D space at an unknown coordinate, $p_0$, and I'd like to determine its position using distances from known coordinates $(p_1, p_2, p_3)$. Beyond using ...
1
vote
1answer
541 views

How can I simulate a pot lid rotating around an axis that is quickly rotating?

How can I simulate the rotation of a pot lid about an axis that is quickly rotating as in the following image? I'm particular interested in the motion of the red dot. Here is my attempt: ...
7
votes
6answers
3k views

Series expansion in terms of Hermite polynomials

I am trying to expand a polynomial in terms of orthogonal polynomials (in my case, Hermite). Maple has a nice built-in function for this, ChangeBasis. Is there a ...
1
vote
0answers
102 views

Publishing quality graphs to Adobe Illustrator? [duplicate]

I am trying to produce publishing quality graphs. I would like to export graphs from a Notebook to Ai (Adobe Illustrator). How do I do this? Just started using Mathematica, very new! Thanks, Anousheh ...
2
votes
2answers
386 views

How to delete the current group-cell using the keyboard?

Related to Delete the current notebook cell using the keyboard. Difference is that here I want to delete the whole group of cells, including the original Input cell and all Print, Output, Message etc. ...
4
votes
1answer
2k views

How do I hide some of Input

I have a project with a friend, and we make some work in Mathematica. He is not very good at Mathematica, and I have made some long necessary formulas we need. I would like to show what I've made but ...
2
votes
3answers
1k views

Calculating Taylor polynomial of an implicit function given by an equation

I'd like to write a procedure that will take an equation: F(x,y,z) = 0 chosen variable: x a point: ...
24
votes
1answer
1k views

Can anyone explain how to use Mathematica's OAuth package?

I noticed that in HTTPClient.m which is included with Mathematica 9 and is located in ...
3
votes
1answer
270 views

Thick border on some ParametricPlot3D objects

Object x should be composed of thick lines, object su should have no or a thin border. With ...
0
votes
1answer
564 views

Upper bound for x

I want to ask a question about Reduce. I have a function, say f[x]. When I use the command ...
6
votes
1answer
284 views

On Reverting Code that Mma Switches to Raw Input Form Back to Standard Form

I experienced a similar issue to what is described in this post while editing formatted usage messages (that contained italics) in the declaration section of a package that I'm developing in the ...
3
votes
2answers
461 views

Nonlinear recurrence relation

I entered the following recurrence relation into RSolve and it just gave the question back to me. $$a_{n+1} = \frac{(1+a_n +(a_{nāˆ’1})^3)} 3$$ Is there another way to get a formula for the nth term?
5
votes
2answers
487 views

Mathematica cannot calculate a limit

When I evaluate Limit[E^(-n)*Sum[n^k/(k!),{k,0,n}], n -> āˆž] Mathematica gives me the result ...
6
votes
2answers
346 views

on simplifying an expression

After some integration process, I ended up with the following expression: ...
3
votes
1answer
343 views

Reuse ParametricPlot3D plotting options [duplicate]

I create several ParametricPlot3D's that all should look the same: BoundaryStyle -> Thick, ...
1
vote
2answers
212 views

How to convert TableForm to proper LaTex and why is “\” not replaced by StringReplace?

I'm trying to optimize the teXForm output of a table because the standard output ist not satisfying: ...
7
votes
2answers
315 views

Is there something akin to “SubgraphIsomorphismQ” in Mathematica 9?

Provided two unlabeled graphs, $G$ and $H$, I would like to test where $H$ is a subgraph of $G$. In other words, I'd like to test whether we can prune some fixed number of vertices or edges from $G$ ...
5
votes
2answers
486 views

Graphing time-series

I'm currently trying to use data gathered as a function of time (here, the fluorescence of a biological sample), but am new to Mathematica and don't know how to properly specify axis relations (and ...
9
votes
5answers
1k views

Is there a built in function to obtain the back diagonal of a matrix?

Given the following matrix: m = Array[Subscript[a, #, #2] &, {4, 4}] how can I find the skew diagonal or anti-diagonal or back diagonal of the matrix (...
1
vote
2answers
178 views

Request help for reading text data files with headers and 2 sections

I just started with Mathematica. I need it for many purposes, but the important one is to read a text data file and extract column values as variables. I have successfully tested the tab delimited ...
1
vote
2answers
1k views

Solve Differential equation system

I've tried to solve this differential equation system, buy without any luck. This is my code: ...
-4
votes
4answers
252 views

Extracting the integers from a list

I have a list where the elements are Reals and Integers. How can I extract the Integer? For example, if I have {1, 2, 3.4, 9.9}, how can I get ...
8
votes
0answers
124 views

Help bogged down at first query [duplicate]

When I open help at the first time in a mathematica session and I submit a query it always get bogged down for many seconds until a message appears as in the picture. Then I select continue waiting, I ...
9
votes
2answers
922 views

Keep MathKernel Running In Background - Speed Up Execution Time

Background: I'm running Debian on a remote server with Mathematica installed. I have several dozen small mathematica files that are run in cron jobs at unpredictable intervals and updated based on a ...
1
vote
3answers
182 views

Help me to find a way to do this repetitive stuff

I'm trying to do this: ...

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