1
vote
0answers
49 views

reset the value of a variable [closed]

Folks, I have a problem in populating a matrix without overriding the values. After performing computations for various values for j, I want to store these values in following matrix. Here is the code:...
0
votes
1answer
139 views

Fourier series of the odd extension of a function [duplicate]

Using Mathematica to make a plot, I noticed that the interval it's defined over must be changed in order to do the Fourier series. How do I change the interval to be on an interval of $[-{\cal l}, {\...
11
votes
3answers
435 views

Best method to find variation in width along the image of a slit?

EDIT: Solutions by @Alexey Popkov and @Vitaliy Kaurov are very intuitive and both can be used to find a solution for the task. I have a slit of 15-18 microns by 1 mm projected with magnified 4X onto ...
4
votes
2answers
92 views

Limiting grid line length in combined TimelinePlots

I am trying to make a complex TimelinePlot in which temporal periods are indicated as shaded areas (using Filling -> Axis) ...
8
votes
1answer
191 views

Dynamic does not update when wrapped in DynamicModule

I'm trying to wrap some dynamic code into DynamicModule to localize all the variables, yet when I do that, the variables stop updating. That does not happen if I ...
5
votes
1answer
122 views

Wolfram Script Not Completing when ran as cron job

I have a fairly simple Wolfram script called from within a shell script that I would like to run at certain times. The shell script calls a python script to get some recordings to from GPIO and saves ...
9
votes
1answer
127 views

How to implement a custom random process object?

I want to implement a custom random process thing1 to pass to RandomFunction. The process I have in mind is conceptually extremely simple: two alternating Poisson ...
5
votes
1answer
272 views

Executing Mathematica code via Notepad++

I wonder if there is a way to execute Mathematica code via Notepad++. After some searching on the web, I found that there is a user-defined language that supports Mathematica highlighting, but there ...
2
votes
1answer
185 views

Confusion with SplineFit (Angle calculation)

This question is continuation to this other one I am creating polymers (where each monomer is of equal length) using this method: ...
3
votes
2answers
126 views

Efficient Sampling of A (Countable) Discrete Distribution

I have a sequence of positive terms $(a_n)$, for which $\sum_{n=1}^\infty a_n = A <\infty$, and wish to take a psuedo-random sample from the discrete probability distribution \begin{equation} \...
2
votes
1answer
102 views

Using PlotRange to cut off outlying points

In the documentation for PlotRange, there is the following line: If a particular minimum or maximum is specified as {Automatic, α}, this means that the range ...
4
votes
2answers
173 views

Dot product for lists

Suppose we want to get the dot product for the following lists aa and bb, whose elements (a, ...
1
vote
1answer
139 views

How to find zeros of 16th degree polynomial with coefficients which contain one symbolic parameter?

I'm trying to find eigenvalues of matrix which is 16x16. Here is a part of matrix: ...
2
votes
0answers
91 views

Is it possible to automatically apply Parallelize when possible

Parallelize in Mathematica is pretty easy to use. Most of the time, applying Parallelize to an expression, it tries to evaluates ...
2
votes
1answer
67 views

Custom display for constructed functions

In a similar vein to my previous question, is it possible to define a function that displays differently to its default? eg I would really like Binomial[a,b] to be ...
1
vote
1answer
72 views

Define operator with special characters [duplicate]

I have looked here which describes how to define operators. I was wondering whether there was a way to assign thes operators to special characters? eg Let $\odot:=(a+b)(ab),$ so ...
19
votes
2answers
311 views

How does Rescale[] handle infinities?

Rescale appears to be a simple function. It just does a simple linear $y = a x + b$ type rescaling of the values: ...
-1
votes
1answer
84 views

3D plot in spherical cordinates [closed]

Y = 0.04 *sqrt (5/(16*pi))*(3*cos[Theta]^2 - 1) + 0.08*sqrt(6006/pi)/64*((1 - Cos[Theta]^2)^3)*Cos6[Phi] Theta = [0, pi]; Phi = [-pi, pi] Need to plot <...
0
votes
0answers
80 views

Inverse Superposition

There are 4 tables that, I have written them as bellow: (m, n, s, and r are orthogonal basis. r.r=n.n=m.m=s.s=1, and m.n=n.r=...=0). a's, b's, c's and d's are coefficients and are numeric values. <...
2
votes
2answers
131 views

How can I check that the general solution obeys the original differential equation?

For example: I solved the following differential equation: y''[x] == (λ x^(3/4) y[x])/Sqrt[1-x] that 0<x<1 with the ...
1
vote
1answer
245 views

How can I use NDSolve with a variable parameter?

I'm a new user and I can't understand how to solve this function for variable values of vr (for example vr from 0 to 5 in steps ...
2
votes
0answers
45 views

How to save the current configuration of preferences?

When I go Edit -> Preferences -> Appearance there are many colors to set. I want to set them all non-default, but I too want to save the configuration and be able to reload it, when needed. My only ...
0
votes
0answers
78 views

Shortest Common Superstring for all k-length strings on an alphabet

Given all strings of length $k$ of an alphabet of size $n$. This gives $n^{k}$ strings. Now I want to create one superstring that contains all these strings as substrings. They hopefully strongly ...
1
vote
0answers
18 views

Value jump in Manipulate when opening input field [duplicate]

In working with some Manipulate functions, I have noticed an oddity when opening the "Show Animation Controls" icon. Here's a simple example that plots a sine wave, ...
3
votes
0answers
284 views

Export 3D plot or Graphics3D object as stereoscopic 3D .jps file

I recently came across some Matlab code to output a 3D graph as a stereoscopic left/right .JPS file, viewable e.g. with 3D Media Viewer, Stereoscopic Player or using any 3D television or beamer: http:/...
0
votes
1answer
70 views

Why I got -Graphics- when i use “Plot”? [closed]

Recently, when i use "Plot" in mathematica 9.0, the result is -Graphics- not a picture. How can i solve this problem?
6
votes
4answers
614 views

How to color the same contour line with different colors according y value

Here is an example: ContourPlot[Sin[y - x^2] == 0, {x, -1, 1}, {y, -10, 10}] Because all these separate lines come from the same contour line ...
0
votes
1answer
80 views

Calculation Performance (slow Plotting)

I have a functions, which is an Integral. It is exaclty this function Zf[x_] := 2*I*NIntegrate[Exp[-y^2.0 + 2.0*I*y*x], {y, 0, Infinity}]; Later I need to plot a ...
3
votes
3answers
103 views

Combining $n$ lists [closed]

From this question, I know how to combine two lists. In fact, if $X_1,X_2, X_3$ are lists with the same length, then the command Transpose[X_1,X_2,X_3] will work in ...
4
votes
1answer
108 views

Formal Differentiation

I'm trying to formally differentiate an expression. (I am aware of how to differentiate formally?, but am unable to generalize the idea) For example: ...
2
votes
1answer
89 views

How to visualize such PopularCurve entities?

The following command EntityValue["PopularCurve", "Entities"] returns a long list of PopularCurves: {dragon curve, ...
0
votes
2answers
261 views

Create a moving plot along a parametric plot using Manipulate?

I have been looking through Manipulate examples and haven't been able to create a working plot yet. I have a parametric plot defined: ...
1
vote
2answers
75 views

Setting constants in a function containing If

I'd like to set the constants in a function that uses If, after it's been defined, but my definitions doesn't seem to stick. Simple example: ...
3
votes
2answers
118 views

Permanently Changing Default Color

I can't find this answer elsewhere, but is there a way to permanently change the default plot color? In 10 the default plots are orangish and in 9 they were a purple-bluish color. Is there a way to ...
2
votes
2answers
133 views

Solve[ ] doesn't work with transcendental equations

How to solve x^5-sinx=0 in mathematica? I try in this way: Solve[x^5 - Sin[x] == 0, x],but t doesn't work.
2
votes
1answer
115 views

P-Values are inconsistent when using DistributionFitTest repeatedly

I am attempting to become more familiar with the DistributionFitTest, specifically the distributions it yields and their fittedness. What I have found is that when I generate random data, fit it, and ...
0
votes
1answer
71 views

Solving differential equation (Analytical or Numerical)

I want to solve the following differential equation for $0 < x < 1$ ...
0
votes
1answer
71 views

NDSolve Problems with Cardiovascular Modeling [duplicate]

I am trying to use 27 simultaneous differential equations to model the cardiovascular system. I have the following code, however, the output isn't giving interpolating functions, but rather another ...
2
votes
1answer
148 views

SetDirectory[NotebookDirectory[]] in one notebook causes Directory[] to change in a different notebook

This is causing me lots of problems. I found that issuing SetDirectory[NotebookDirectory[]]; in notebook A.nb causes subsequent ...
2
votes
1answer
73 views

Why are these methods giving me different results? (Trying to test SplineFit)

I am creating a polymer(where each monomer is of equal length) using this method: ...
6
votes
3answers
143 views

Evaluate a expression split in a list

I have a list with this format {integer, sign, integer, sign, integer}, sign being one of these: Plus, Subtract, Times, Divide. For example, let's say: ...
3
votes
0answers
129 views

Why is Thread[{ a, b }] the same as Transpose[{ a, b }]? [closed]

I understand the idea of both Thread and Transpose, but do not understand whatever nuance it is that makes Thread[{ a, b }] == Transpose[{ a, b }] Where ...
10
votes
2answers
389 views

AJAX-style HTTP calls triggered by a variable change

I'm trying to create a dynamic InputField that would autocomplete the address as I type it into the field, by calling Google Maps' GeoCoding API on every change of ...
0
votes
1answer
71 views

Stopping sliders in Manipulate going to dynamic unfeasible regions

I am trying to use Manipulate to create a function which allows a user to play with a probability density. The following generates a static density over the range 2000 - 4000, then allows the user to ...
-1
votes
1answer
82 views

Coefficient: how to simplify the “form” [closed]

The title is not very clear, but my English is not that good, so I didn't know how else to write it. So, let's get to the problem. I have a list of elements, in form of a sum, like this: $finalstate ...
1
vote
0answers
111 views

Finding the global extrema of a surface? [closed]

I am trying to figure out how to find the global extrema of the function surface shown below and can't seem to get answers that make any sense. I am using the FindMinimum and FindMaximum functions ...
3
votes
3answers
222 views

When using NDsolve, how to determine the positions of steady states?

I am currently trying to numerically solve a set of ordinary differential equations of chemical kinetics. However, I want to implement perturbations only when system reach steady states. For example ...
5
votes
2answers
80 views

How to define a function to save a list to a same-name file

I want a convenient way to save lots of intermediate data lists into files, so that next time the files can be imported automatically to homonym list variables in the notebook, without having to ...
1
vote
1answer
135 views

Bin a large matrix

I have a large dataset and I'm trying to plot its scatterplot as well as an overlayed set of binned "summary" data points (in a different color of course). My intended effect is similar to this one ...

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