# All Questions

195 views

### Sequence of binary trees with different source nodes and with the same Strahler hierarchical order

I would like to create a picture which contains a sequence of binary trees with the same Strahler hierarchical order (for example equal to 2) e with a sequence of different source nodes "i" (from 1 to ...
186 views

### BarChart with two ChartLabels

I am creating a BarChart, where i wish to have the actual value on the top of each bar and the label of the bar on the bottom. Basically i have created the BarChart with the label in the bottom, but i ...
338 views

### ListDensityPlot and ListPlot3D with big data [duplicate]

I have a large data set (512 x 512) and I have problems plotting it. ListPointPlot3D works fine But ListDensityPlot won't go through all the points (the same goes for ListPlot3D): Is there a way to ...
310 views

### Creating directory structure through Mathematica

Is there mkdirs() (make directory structure) equivalent in Mathematica? I want to specify something like this : dir1/dir2/dirn ...
513 views

### Find the values of 3 variables that best fit 6 equations [duplicate]

I have 6 equations ...
134 views

### Displaying the roots of a complex function using ListCurvePathPlot

I have the following algorithm: ...
1k views

### how to solve second order nonlinear coupled differential equations using NDSolve with hyperbolic function

i have to solve some solitons scattering through this coupled equations. i need to get two different graph, but still the graph did not come out. and also the equations quite complicated containing ...
289 views

### Animating the steps of a Kohonen SOM in Mathematica [duplicate]

As the title suggest, I'm trying to make an animation of how a bunch of points into 2-D (and possibly 3-D space) evolves by each step of my program. In order to do so I've data which contains the x ...
82 views

### Calling variables with use of numbers in their names

I have got few huge matrices named by ascending numbers, e.g. x1, x2, x3,... and I need to do the same operation with all of them - to multiply their components, ...
143 views

### Mathemathica: How to plot diagram? [duplicate]

i want to plot a diagram by this command using mathemathica. but it plotted as a beeline while it must be have a bit aberration.what is my fault in plotting? i want to display my diagram such as ...
266 views

### How to represent the lines that are formed by the intersection of two planes?

I am trying to set up Brillouin zone and representing the lines that are formed by the intersection of two planes is part of my step. I have tried the sample sections from the graphics guide book, but ...
115 views

### Why am I getting wildly incorrect results from FirstPassageTimeDistribution with inexact transition matrix?

Working on some large systems using DiscreteMarkovProcess, I changed the transition matrix to machine precision vs using exact values, which sped things up handily. ...
1k views

### How to compute the curl of a vector field?

Can anyone help me out with this? I am trying to get Mathematica to evaluate curl of a vector field. The vector field is ...
151 views

### Create formatting wrapper for use with ToString

I'd like to create a custom number format for use with ToString. However if I do the obvious and create a function that calls ...
297 views

### How to force the compilation language to be C++ (not C) in CreateExecutable or CreateLibrary

I'm trying to speed up a section of a Mathematica 9.0.1 notebook by performing some calculations in C++ with the Cilk Plus and Threading Building Blocks tools available for the Intel C++ 14.0 compiler ...
263 views

### Hierarchical clustering: convert Mathematica cluster hierarchy to NEWICK format

Can anyone tell me a clever way to convert the hierarchical clustering object, created, say, by Agglomerate or DirectAgglomerate ...
363 views

### Reading specific entries from a CSV file

This question is related to the following: Speeding up Import and Export in CSV format Stream CSV files Reading periodic elements from a large file I have a set of very large CSV files (a few ...
187 views

### NIntegrate returns zero for non zero integrand, 4d Integration

I am trying to calculate the following integral. ...
210 views

### How to place more than one ChartLabel in a BarChart

I have the following data: ...
225 views

### More efficient implementation for comparing coefficient lists in a Do-loop

I'm wondering how to speed up the following code so it actually computes for $n=2$: ...
589 views

### Principal Components - how to obtain linear transformations?

I have a list "xlsf" with 6 columns and 1200 rows for PCA analysis. The PrincipalComponents[xlsf] gives the following: "The principal components of matrix are ...
252 views

### Manipulate Iterated Logarithm

Could I create a third slider that controls two other sliders? I would like to master slider to move slider k from min to max, at which point, the master slider ...
186 views

### Assign named placeholder to a variable (as a string)

If I want to assign a regular placeholder as a string, it's very easy: (anything the user types in will automatically be given quotes around it, so when they evaluate the cell str is a string) ...
99 views

### Create polynomials from Series

This question actually doesn't have quite a lot to do with the Series function, but I don't know how to describe my problem. So here's the thing. I'm trying to ...
73 views

### How to make the coordinate indicator in a plot bigger? [duplicate]

I want the little vertical line which indicate the coordinate of the system in plot bigger. For example, in the picture below I marked those lines I am talking about with a blue rectangle. How can I ...
218 views

### How to add the position of an added vertical line to the plot itself?

In this question it is answered how to add a vertical line to a graph. However, it has not been shown that how can someone add the position of that vertical line to the axis. How can I add the ...
2k views

### How do I change my font size to 18 points globally? [duplicate]

The default font is WAY too small. I can't read it on my jumbo-size laptop monitor, and my professors can't read my papers when I turn them in. Can somebody please provide DETAILED instructions on ...
97 views

### Import array indices from Excel

In an Excel file, I have some numbers which I will use as the indices of arrays. I want to read those numbers and assign them as the array indices in Mathematica. For instance, in Excel I have and ...
99 views

### Rendering of a HighlightGraph in a Manipulate content pane distorted by changing the highlighted edge

A HighlightGraph inside a Manipulate initially displays correct however after approximately 2 seconds, the layout changes and ...
83 views

### NMinimize not starting [duplicate]

I am new to Mathematica so I might be asking a trivial question, although I wasn't able to resolve it for several days. I am trying to optimize a 7x7 matrix with 12 variables with a certain evaluation ...
887 views

### Maximum of Minimum of a two variable function

I have F[x, y] := (y/2)(2 Cos[2x] + 2 Cos[x] + 1)/5 + ((1 - y)/2)(2 Cos[x] + 1)/3. I am looking for the maximum of the minimum of ...
90 views

### Manipulate and OpenerView

I have discovered a problem with OpenerView. My opener views always close when I change the value of the manipulator control in my ...
116 views

### Dramatic increase in memory consumption and performance drop with ParallelMap

Consider the following toy problem: ...
1k views

### How to create these famous surfaces in topology with the desired color effects?

It was said such real objects of famous topological surfaces were plotted by the cooperation between mathematician Richard Palais and artist Luc Benard, and published as the cover page of Science ...
87 views

### Generation of Sliders via Tables/For loops

I have a list named data that contains lists of arbitrary size, data={{0.5, 0.5}, {}, {0.5, 0.5, 0.5}, {}, {}, {}, {}, {}, {}, {}} I now want to generate for ...
30 views

### how to export multiple graphics from Do loop? [duplicate]

I would like to export graphics generated from do-loop as jpg. There will be like more than 100 graphs. I want to combine it later in latex beamer as animation. When I put Export command inside the ...
263 views

### A regularized hypergeometric function related question

I'm interested in finding a way (if possible) of expressing this specific value of the regularized hypergeometric function in terms of known constants. How might I use Mathematica to check this ...
107 views

### Nest Replace Function with different rules

I have a table of data that I want to filter. Any value of zero in the table means that value was not calculated, so it should get populated with the tag "NC". Next the table is filtered for all ...
576 views

### Fourier series for rectangular wave incorrect, why?

I'm trying to get the fourier series function(s) to work for a square wave with duty cycles other than 50% ie rectangular wave. ...
554 views

### Marking specific points on a 3D curve

Here is the curve below. (written as a position vector) r = {Cos[7 Pi*t], Cos[6.2*Pi*t], 2.5*t} ParametricPlot3D[r, {t, 0, 2}] I want to know how I can mark ...
1k views

### Control BarLegend size

I want to plot a big 2D array of experiment data. I need plot axes and tick labels as well as a bar legend using BarLegend: ...
1k views

### Finding all maxima and minima of a function

To find all (global and local) extrema of a function in $\mathbb R^3$, I have written the following. Example function: ...
462 views

### Solution given by Wolfram Alpha but not _Mathematica_

Why will Mathematica not give a soluion to Solve[Log[x] == Log[j, Log[j, x]], j], but Wolfram Alpha will?
741 views

### Obtaining the envelope of an oscillating function and perform fitting

There is an elegant way to obtain the envelope of an oscillation function explained here http://mathematica.stackexchange.com/a/27854/15966 My question is how to modify the code below so I can fit ...
328 views

### Trying to combine an image with a Plot

I've got this picture: The image has a resolution of 2001x2001. The left most pixel has an x-value of -2, and the right most pixel has an x-value of 2. Same goes for the y-values. Now I am trying ...
48 views

### Automatic Cuda/CPU code; Fast programme run [duplicate]

I have developed my thesis codes by means of Mathematica software in a .nb file format. Despite using the available Parallel code capabilities and doing all the numerical integrations by means of ...
17 views

508 views

### How to get better quality EPS graphics

Yesterday, I was doing any Tables of 15 graphs similar to the next example, to save .eps and use in latex. In the generation of the graphs Mathematica spends many time. Is possible to reduce this ...
121 views

### What is wrong with my use of Flatten? [duplicate]

Why does Flatten[f[g[a, f[b]], f[c, d]]] result in f[g[a, f[b]], c, d] I expected the answer to be ...
153 views

### Plot roots of B(z) according to angle small to large

I have the following function: B[z_]=((z*(z - 0.5)*(z + 0.5))/((1 - 0.5*z)*(1+0.5*z))) I want to plot the roots this polynomial according to angel like below ...

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