All Questions

109 views

ParallelEvaluate: Evaluation Rules and Increment

I'm trying to understand how ParallelEvaluate works, considering the two following snippets: ...
43 views

Bar legend does not display values

My BarLegend shows only zeros instead of right values and I cannot find the reason. I set following minimum and maximum: ...
191 views

How to generate a random binary tree with a given number of vertices and with a given shape, namely compact or elongated

I tried to generate a random binary tree with a Table of RandomInteger and to give a shape with a ...
84 views

User defined output forms

I have a mathematica program which performs some manipulation which I then want to continue in another language, as I already have some code written in it. Syntactically this language is very similar ...
122 views

how can tangent half angle substitution be done in Mathematica?

Is it possible to replace sine and cosine in terms of tangent half-angles and again the tangent half-angles by a variable say t?
138 views

Collapsible Group of Control Objects

I did what I believe was a thorough search on this topic, but still ended up fruitless. Apologies if there is a trivial solution to this. Is there a way to group control objects together to form ...
106 views

LiftingWaveletTransform with irregular grids

One of the properties mentioned in the literature about the lifting wavelet transform is that it can be applied on irregular meshes or grids (i.e. not equally spaced samples); but I don't seem to see ...
429 views

Visualization: elliptical insights into data sets…

I was recently reading the following paper on visualization techniques using ellipses to gain statistical insights. Elliptical visualization for looking at correlations has briefly been touched on ...
129 views

multiple sequential definitions, defining own set function

I want to define a function for doing multiple definitions, where I apply the same function f to all values, and definitions are done not at the same time but after ...
190 views

Solving a system of equations using matrix form

Please bear with me as I am a beginner at Mathematica. In the following system, all variables on the right hand side are known, except for w1, ...
254 views

BoxWhiskerChart without whiskers

I would like a chart showing the median, 1/4, 3/4 quartiles, without the whiskers or fences. how can I achieve this? I cannot figure out how to turn off both the whiskers and the fences in the result ...
167 views

Plotting: DensityPlot produces artifacts

I am trying to plot the electric potentials of bouncing balls using the following code: ...
219 views

How to find a particular solution using NDSolve

I'm looking for a way to find a specific solution to a differential equation. As a simplified version of my problem, here's a similar setup for a simple harmonic oscillator problem. ...
84 views

Finding integral bounds

i have this integral shown below is equal to 1, and i need to find "a" on mathematica, but I'm not sure how. integral (from 0 to a) sqrt((-50.8938 sin(8.4823 t))^2+(4-11.3097 sin(11.3097 t))^2) dt = ...
145 views

Smarter way of manipulating plot style?

Say, I have a colorlist listColor={Black,Brown,Red,Cyan} Now, I have some Plot function that I can use this list: ...
151 views

NIntegrate: Catastrophic loss of precision

Below is a simplified code that I am trying to evaluate. I am basically getting the rms value of a Wakefield function. When I finally try to evaluate the rms, I get an error. Any help would be greatly ...
59 views

Showing Steps of Calculations [duplicate]

I'm solving a a differential equation in Mathematica and was wondering how to show the steps, like how Wolfram|Alpha does it, in the program. Any ideas?
290 views

What is wrong about Abs[x]-a? Is it a bug?

Why is the Out[74] not {1 - a, {x -> -1}}? ...
554 views

Find all roots in the interval of nonlinear equation

I am struggling on how to find all the roots of 1+1/2^x+1/3^x==0 which lie in a given of real and imaginary interval. Solve ...
82 views

Timing Differences

In More efficient implementation for comparing coefficient lists in a Do-loop link, george2079 posts in his first answer a piece of code that takes 352 seconds to compute. When I run this same piece ...
72 views

95 views

Solving for variables that satisfy an equation

I have the following ...
163 views

Looking for an elegant way to solve a (system of) ODEs/functional equations with undetermined coefficients

I want to solve an ODE using undetermined coefficients/guess-and-verify and am looking for an elegant way to use this technique. I am running into a few ugly warts. Here is a basic implementation for ...
61 views

Elements of a List according position in axis

({{a, b}, {c, d}}) a, b, c and d are Lists of 300 length. Their first 4 elements must specify their position in the column (1 column, 2 column, etc) and the ...
123 views

Defining tensor components generally

I would like to define a tensor according to its components, something like the following: [F(x)]_i,j = Integrate[f(x,y)A_i(y)B_j(y),y] where i and j are ...
252 views

NSolve for high degree univariate polynomials

I am trying to solve a high degree univariate polynomial using Mathematica's NSolve command. But when I plug the solutions generated by Mathematica back to the equations, the equations are massive ...
104 views

Select words from different rows of column headings

I have a 2-dim array. The first 3 rows have column headings. The heading can be a single word, or 2 words (which take 2 rows) or 3 words (which take 3 rows). For each column I know which row has ...
896 views

Find the smallest positive integer that satisfies a certain condition

I know Mathematica is really powerful when it comes to functional operations like applying a list of tasks to a list of variables. Sometimes I feel like it isn't the most powerful tool when it comes ...
276 views

Keep kernel running for execution of scheduled task

How can I keep a kernel running until all scheduled tasks have completed? For example upon running the following script bazinga.m: ...
71 views

How to add more than one label to Histogram automatically

I have a huge data and I want to add two labels to the Histogram. the problem here is that the labels are calculated and added automatically to the histogram. for example if I have the following ...
78 views

importing a file with asterisk in its name (Linux machines)

I am trying to import a file: ...
363 views

Scalar product operator of complex vectors

What is the scalar product operator for complex vectors (or matrices) in Mathematica? The usual $Dot[]$ doesn't work. E.g. here is what the Mathematica gives $$\{1,0\}.\{I,0\}=I$$ but the answer ...
581 views

How to make custom discrete color data function

Attempting to make custom discrete color data function: my custom color: is it possible to use my custom color ...
179 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 ...
111 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 ...
111 views

NDSolve :: ndode error while solving an coupled ODEs

I have a scenario where in trying to solve for the ground-state of a Hamiltonian, I require to be able to solve some coupled differential equations. Prior to this I have already set k=1 and Δ=5  ...
190 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 ...
180 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 ...
365 views

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

I have 6 equations ...
119 views

Displaying the roots of a complex function using ListCurvePathPlot

I have the following algorithm: ...
956 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 ...
214 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 ...
79 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, ...
108 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 ...
211 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 ...
105 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. ...
536 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 ...
126 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 ...