2
votes
2answers
94 views

How to combine notebook into one cell

I want to have my entire notebook be a conditional while statement. However, I don't want to merge all of my cells together, as it is a long and detailed process. Is there a way to create another cell ...
0
votes
2answers
179 views

How to control the layering of graphics displayed with Show

I am trying to combine two graphics objects using Show. The first one is an isosurface: ...
11
votes
5answers
450 views

How would you efficiently implement BinListsBy?

Let's say I have a list like this: data = {{21, "Alice"}, {27, "Bob"}, {22, "Charles"}, {34, "Dora"}, {75, "Eliza"}} containing ages and names of persons. What I ...
3
votes
1answer
58 views

Strange NSum behavior for slightly larger number of terms

For some sums, NSum gives me the result nicely for some number of terms, but if I add one more term, it suddenly becomes much slower. I haven't found the minimum example for which this can be ...
1
vote
1answer
92 views

Prohibiting Autorun in a Manipulate?

One of the four possible AppearanceElements for Manipulate is "ManipulateMenu" which provides a number of features such as ...
1
vote
0answers
34 views

Determine Functions Given Data Points [duplicate]

Is it possible for Mathematica to solve for f(x,y) = 0 such that {x,y} contains {{0,0.5}, {1,0.5}, {0.6,0.8}, {0.4,0.2}} ? Do we need to specify f(x,y) first ? ...
0
votes
1answer
104 views

Put a rounded parentheses in a label [duplicate]

I have this plot: ...
1
vote
2answers
84 views

Using Combinatorica`ListNecklaces in v9

I am using Mathematica for visualization of DeBruijn graphs. However, I am having a bit of trouble using ListNecklaces. I want to know how many cyclic shifts of ...
3
votes
1answer
306 views

How to map vertex points from the surface of a straight pipe onto 2D plane

How to map vertex points from the surface of a straight pipe onto 2D plane. The 3D surface points of the straight pipe can be found here: data Working code: ...
0
votes
0answers
100 views

Failing to get a coloured coordinate in 4D plot

I am trying to get a colour data plotted according to a coordinate. I am working with 4D vectors, with three spatial and one temporal coordinate. I tried the accepted answer at Plot 4D data with ...
0
votes
1answer
105 views

Help with Computation-heavy triple integration

I'm Trying to use Mathematica to symbolically integrate a function with respect to x, y, and z. For some reason, this computation either takes about, 60s and returns the input, or takes many hours ...
2
votes
0answers
60 views

Natural boundary conditions variational methods

I am working on a problem of the calculus of variations. From the Variational Methods package, I can very conveniently use EulerEquations to get stationarity ...
3
votes
0answers
207 views

Understanding performance: graph connected components

I need to analyze directed graphs with 10M edges, 1M vertices, and 300K strongly connected components, so that the largest one contains 400K vertices. I read some explanations of Leonid Shifrin here, ...
6
votes
1answer
127 views

Why PlotRange doesn't work for this set of values? [duplicate]

This code, doesn't show me data corresponding to x axis values 1000 and 10000 ...
5
votes
8answers
527 views

How to add a column to a table that counts the number of times the lines appear?

I am at a complete loss at this. I have a table with 2 columns and n lines. Some of the lines are repeated. What I want to do is add a new column that counts the number of repetitions of each line. ...
1
vote
1answer
172 views

NIntegrate failed to converge?

Hey guys I have a pretty simple code that consists of an RMS calculation. The issue is that I am getting quite a few error messages when I run it. The following equations are highly published physics ...
-2
votes
2answers
124 views

plot data with small differences

I want to plot data with very small differences. I can't see the differences in my plot:
2
votes
1answer
225 views

Define function that counts recursive fibonacci

If I write count=0; fib[0]:=(count=count+1; 0); fib[1]:=(count=count+1; 1); fib[n_] := (count = count+1; fib[n-2] + fib[n-1]); Then I can ...
4
votes
3answers
2k views

Smooth 4D (3D + color) plot from discrete points

I have a file containing isosurface $\{x,y,z,F\}$ data (around 9000 points). My goal is to generate a smooth (NOT a discrete set of points!) colored surface using ...
3
votes
2answers
165 views

A suspicious result of an integral

I integrated this term in Mathematica: $$\int_{-\infty}^{\infty} d\omega*\sin(s*\omega)*\frac{1}{e^{\beta*\hbar*\omega}-1}*\frac{\omega}{\omega^{2}+\gamma^{2}}$$ The code in Mathematica: ...
0
votes
4answers
232 views

Label each panel of Grid

I have a set of figures that I would like to show as grid for a publication. I currently just export the figure as an eps and use another software package to add Labels (A,B,C,D) to each panel of the ...
3
votes
1answer
324 views

State “i” goes to state “j”

I would like to have a code that given a state "i" in S, it give the set of states "j" which are accessible from "i". Is that possible in mathematica? My state space (S) is ...
0
votes
1answer
64 views

Determination of export video runtime

I have a huge simulation and tried to export it as a video file (or .gif). However regardlessly what I specify under the Framerate option the video its just running for 4 seconds (too fast). When I ...
0
votes
2answers
120 views

Discrete ContourPlot3D with restrictions

I have the follow simple condition between integers: k - 2 h - l == 0, which describe a plane that I plot with: ...
8
votes
3answers
399 views

How to parse information contained in a file name

I have a set of files containing my data, and the file-names contain relevant information that I would like to extract. What I have is: ...
0
votes
2answers
291 views

Extract X value from corresponding Y value from a List or Transpose [duplicate]

I have a list of X values and Y values separately, and also together with: data=Transpose[{X,Y}] This data is from a chromatogram, and I want to extract the ...
1
vote
1answer
410 views

Look up a non-US stock price

I need to get historical prices of certain non-US stocks (specifically, they are traded at Prague Stock Exchange, Czech Republic) but I am not able to find the proper "name" that Mathematica would ...
3
votes
2answers
304 views

How can I get thicker lines in the legends of a ListLinePlot?

I want to have thicker lines in the legends of this plot: ...
0
votes
1answer
157 views

How to plot a list of lists with ListLinePlot?

(edited, after rasher comment, changing any detail and variable names) You can plot an evolution with 3 lines (up=maximmun, in the middle=mean, bottom=Minimum) with this code ...
1
vote
1answer
236 views

Plot a vector valued function of two variables using color density

I have a vector (3D) valued function of two variables. I want to visualize it as a density plot, using R,G,B color values to display the value at the point (x,y). I've come up with a couple of ...
1
vote
1answer
83 views

Output resets when after closing/reopening the file

I've been having an issue in a project I am working on for a demonstration that involves a manipulate containing buttons that influence local variables. In essence, the problem is demonstrated by this ...
1
vote
1answer
108 views

Calculate support of given wavelet

I am calculating approximations using wavelets but outside the multi resolution analysis framework; particularly, I am not using the built-in wavelet transforms. Still, I need to calculate ...
1
vote
2answers
167 views

Extract data from DateListPlot, limited by PlotRange

Extracting the points from a line in a ListPlot in this answer uses points = Cases[Normal@plot, Line[pts_] :> pts, Infinity]; This works in DateListPlot ...
4
votes
3answers
182 views

will the same result be evaluated twice per evaluation?

here is the silly question of mine, if mathematica takes 3 seconds to evaluate the function ...
0
votes
0answers
102 views

Centrality measures and normalisation

Are centrality measures normalised in Mathematica 9? Only ClosenessCentrality is normalised. How I can normalise other centrality measures notably ...
3
votes
1answer
212 views

Tell Mathematica to factor something specific

Is there a way to tell Mathematica to factor $$ \frac{1}{1-x^2} $$ from a large expression? For instance if the expression is A_1+A_2+A_3 and I want to factor ...
1
vote
1answer
104 views

Write an expression as a full derivative

Is there a command that tells Mathematica to try to write the terms (if possible) of an expression as total derivates? Example: I want to tell mathematica to write ...
0
votes
1answer
99 views

Combine a contour plot of a conic and an inset with an polygon such as all its vertices are on the conic

I have a difficulty to programmatically adjust the size of a polygon within an inset of a conic (here I limit myself to a circle) in order to have all its vertices on the circle: ...
0
votes
0answers
167 views

How to resolve Start up error 502?

My Mathematica is not launching properly (I run it on Ubuntu 12.04 LTS). Here is the screenshot of the error message. I've tried the following suggestions : ...
0
votes
1answer
97 views

Select duplicate values from a list [duplicate]

How can I select the duplicate values in a list? Example: {1, 2, 1, 1, 1, 1}
8
votes
5answers
989 views

Generating an Ulam spiral

An Ulam Spiral is quite an interesting construction, revealing unexpected features in the distribution of primes. Here is a related topic with one answer by Pinguin Dirk, who has provided one ...
2
votes
2answers
293 views

How can I propagate an asymmetric error in a function about the central value?

If I have some asymmetric error about the central value in x and y, then how can it be propagated in a function f[x, y, z]? For example, given ...
0
votes
2answers
117 views

I have the roots; how can I find an equation that they will satisfy?

I have two solutions; I want is to find an equation that these solutions satisfy using mathematica. The solutions are $x= \frac{{(26-k)}^2}{26}$ and $y= \frac{{k}^2}{26}$. I know by hand computing ...
2
votes
1answer
135 views

distance between each vertex of a graph and its output

I have a question regarding this Q&A. Let's call a vertex that is not the tail of any directed edge an output of the graph. The graph below has only one output (at the far right). If I want the ...
6
votes
6answers
2k views

Convert a string into a list of numbers

I got the following problem I don't know how to solve or if it's at all possible to solve(I'm quite new to Mathematica and don't have an IT background, so please explain slowly if possible:)) I'm ...
9
votes
1answer
519 views

Relative performance of the Julia language

I was just reviewing the Mathematica benchmark code linked from the Julia language home page http://julialang.org/. The stated goal of the benchmarks is to test the performance of specific algorithms, ...
-2
votes
1answer
152 views

how draw root locus in mathematica 9 for a special case

my closed loop transfer function is: H(s)=2exp(-q)/(1+exp(-2q)) q=sqrt((a+k*sqrt(s)+s)*s) , s=sigma+jw how can i draw root locus of H(s) as 'a' changes for ...
1
vote
2answers
602 views

3D Plotting with PieceWise function

Im trying to plot the following function: $f(x,y)$ = $\left\{\begin{matrix} (x+y) & (x,y) \in T \\ (x+y)^2 & (x,y) \notin T \end{matrix}\right.$ where $T= \{ y\leq -x+1, x\geq 0, y\geq ...
5
votes
4answers
800 views

How to completely delete the head of a function expression

Is there any way to completely remove the head of an expression function? For example, how would I remove the head Cos from ...
0
votes
2answers
258 views

ListLinePlot with colors from data

I am trying to color a simple 2D plot (using ListLinePlot) based on data in the form of 3-vectors. ...

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