3
votes
1answer
49 views

Conditional replacement of all occurrences of a variable?

I know there is functionality in Mathematica to perform replacements like: x[a] d[a,b]/.y_[z_] d[z_,p_]->y[p] Which naturally gives ...
3
votes
1answer
79 views

Create a ProbabilityDistribution

I am trying to wrap my head around the function ProbabilityDistribution. For training purpose, I'd like to recreate the binomial distribution (without using it) so that the two code lines return the ...
5
votes
2answers
102 views

Removing spurious parenthesis in `TraditionalForm`

I don't understand the following behavior (in v 9.0.1) of TraditionalForm regarding insertion of parenthesis. Let us start with the a definition for ...
1
vote
0answers
105 views

Can NIntegrate be used with the Levin method in several dimensions?

I've got some data in the form of an interpolating function. It's a function of three variables, $\rho(x,y,z)$. I'd basically like to integrate this with some phase over a cube of known size, like $$ ...
3
votes
0answers
91 views

Calculating eigensystem of a matrix containing very small numbers [duplicate]

I'm dealing with a matrix containing very small numbers like 10^(-370). When I compute the eigensystem of my matrix, it takes too much time, though the matrix size is not large. Can anyone explain ...
0
votes
0answers
78 views

how to read this result? [duplicate]

...
5
votes
3answers
182 views

Can I regroup terms into a sum?

Is there a way to regroup terms into a sum? I mean, for example, if I have the sequence $\quad \quad S_1 S_2 + S_2 S_3 + S_3 S_4 + S_4 S_5$ I would like to get the form $\quad \quad {\rm Sum}[S_i\,...
2
votes
1answer
196 views

Function of a random variable

Here is a probability density function (PDF) pdfq[q_] = C q^(4 n ν - 1) (1 - q)^(4 n μ - 1) $$P_q(Q=q) = C q^{4 n\nu - 1} (1 - q)^{4 n \mu - 1}$$ I'd like to ...
9
votes
3answers
367 views

Operate over list of pure functions

I have list of pure functions (All functions are InterpolatingFunction) i.e {{a, b}, {c, d}, {e, f}, ...} and I would like ...
1
vote
0answers
103 views

Solving an equation for rational modulus 1

I want to solve an system of equations of the form $$\prod_{i=1}^n x_i^{M_{i,k}}=1 \qquad k=1,\ldots,n$$ with complex $x_i$ with constraint $|x_i|=1$ and $M_{i,k}$ integers. This is basically a ...
15
votes
1answer
445 views

What is the right place for user-defined init.m?

What is the right folder to put a file init.m which will be run after all other init.m files applied by the various components of Mathematica have done their job? ...
6
votes
4answers
732 views

Change string date/time to be understandable for mathematica

I'm trying to convert a string of a data and time to be understandable for mathematica (I want to make time related plots). However, I can get my head around how to do this. For example: ...
1
vote
2answers
94 views

Generate a sequence of names such as a1, a2, a3 [duplicate]

How do I generate the sequency {disp1, disp2, disp3, ...}? I tried the following but it didn't give me what I expected: ...
1
vote
0answers
34 views

How to make a real number parameter go 2 decimal precision? [duplicate]

I'm new at community and I'm starting with Mathematica. I'm now having a trouble with a very simple problem which for many of you might be really obvious. In documentation ...
3
votes
1answer
128 views

Compatibility of Mathematica 10 and Endnote 7 on OS X

Given the new updates, are EndNote 7 and Mathematica 10 compatible when running on OS X?
1
vote
0answers
42 views

How to Plot with different styles different InterpolatingFunction [duplicate]

Im sorry for this question I'm new and it may be a stupid question, but I can't find nothing specific. I have these differential equations and NDSolve give me <...
1
vote
0answers
128 views

Exporting Code to pdf

I want to export Mathematica Input and Output code to pdf (for usage with Latex). I select the cells and use "Save selection as". However, the font size of the pdfs is to large for Latex usage and if ...
0
votes
0answers
218 views

NMinimize ignores constraints

I have a problem with NMinimize - I try to minimize quite a complicated function and use a couple of constraints (the way it is shown in the documentation). Now, ...
7
votes
2answers
612 views

How to create a function like in Python

I want to call a function that would perform a function rather than assigning an expression to them. I.e. ...
1
vote
0answers
92 views

Simultaneous fitting to multiple data sets with multiple variables and some common parameters [duplicate]

I am trying to fit two data sets to a function model described below which share a few common parameters. Say I have two functions with some common parameter(s) ...
0
votes
1answer
376 views

How to find all roots of a complex number [duplicate]

Finding all roots, and I know there are four f them, of this (1 - i)^(1/4) Not only real, but imaginary as well
1
vote
1answer
197 views

Mathematica 8 remove black background from image

How do I do that in Mathemtaica 8? I have found on this site many options like RemoveBackground[], but they don't work in Math.8. Are there any options? Here is ...
4
votes
2answers
427 views

Why doesn't FullSimplify simplify expressions with DiracDelta?

I want to simplify a complicated expression with some Dirac delta distributions, but FullSimplify does not do what I want. Specifically, I want ...
9
votes
1answer
557 views

Oval or Bunimovich stadium

The dynamic billiard demonstration, that can be found on wolfram demonstrations (here), is only designed for an ellipsoid-shape boundary(snapshot below). The idea is to have a dynamic billiard with ...
5
votes
2answers
295 views

Manipulate showing the trajectory of a particle

I'm trying to plot the trajectory of a particle: ...
6
votes
1answer
115 views

How do I format the output to include the function definition?

To explain, I do most of my probability homework in Mathematica, and use the typesetting built into Mathematica to finish answers. Often, I want to output a function as the answer to a problem, but I ...
5
votes
3answers
672 views

How to generate a chirped signal

As there is no ChirpSignal function in Mathematica, can anyone tell me how to write a custom function to generate a sinusoid with a frequency that changes ...
2
votes
1answer
171 views

How to take derivative of a tensor leading to kronecker delta? [duplicate]

I'm trying to write a Mathematica program to find derivatives such as the following simple example: Could you please help?
7
votes
2answers
293 views

Why doesn't this pattern work?

I want the in-built function Count to count the elements in a list which are greater than a value. Example: ...
2
votes
3answers
204 views

`Solve` with variables as single vector

Say I have a set of equations where the unknown variables are the elements of a vector $c=(c_1,c_2,\ldots)$ and want to solve it for $c$. Is there a way to do this with ...
2
votes
1answer
115 views

Compile with modification of arguments' values

Is it possible to compile while changing the value of the arguments the function receives, instead of just creating new variables, and then returning those new variables,i.e., is it possible to pass ...
16
votes
0answers
253 views

Bug(?) in version 10: Tooltip and ListPointPlot3D

Bug introduced in 10.0.0, persists through 10.1 The coordinates of a point in a three dimensional graph can be shown in a tooltip: ...
5
votes
2answers
2k views

Find all roots in range

Is there any way to check for all roots in a range? Jens' findAllRoots function is pretty good, but runs at approx. 10% of roots missed when I ran a quick check on ...
4
votes
2answers
531 views

Colorize Grayscale Image

I have a grayscale image that contains two objects. The grayscale pixel values can be divided into three intervals where two of them represent objects and the third represents the background. The ...
2
votes
1answer
73 views

Unprotect fails the first time, works on second pass [duplicate]

I am redefining some of the standard math functions. I know this is dangerous, so I am trying to be extra careful. (For instance, in the redefinitions, I make sure to only match a custom head) The ...
4
votes
1answer
242 views

How can I use multiple Textures in Graphics3D

I am creating a Graphics3D object for a box using 6 Polygons (1 per side). I can use one single Texture on one or more sides but I can not find a way to use different Textures for different sides of ...
2
votes
2answers
144 views

Using conditionals to check if LinearSolve found a solution

Is there some way to check if LinearSolve found a solution using conditionals in Mathematica 9? I need to solve a large number of linear equations, but I am only interested in the cases where there ...
13
votes
3answers
345 views

ListContourPlot in V10

Bug introduced in 10.0 and persisting through 10.3.1 or later It seems that I obtain different results when using ListContourPlot under V9 and V10. Using this ...
1
vote
1answer
140 views

Nothing happens when I click the mouse clicked on my graphics

I wrote codes to record list of coordinates when mouse clicked. It is expected that the coordinates should be plotted dynamically. But actually nothing happened. Can anybody help me to find the reason?...
0
votes
2answers
76 views

How do I get a Do function to create a list?

I have a Do function which gives me a column of expressions. How can I get the Do function to give me these expressions in a list. i.e The do function gives me this: a b c d I would like it do give ...
-1
votes
1answer
154 views

Rotate points by 60° in 2D

I wrote this code, to rotate a list of points 60° about the first point in the list in 2D, but Mathemtica says: "Recursion depth of 1024 exceeded."
8
votes
1answer
231 views

Vertex merging in graph?

Given a Graph such as the one produced with the following code ...
3
votes
2answers
314 views

How to define multiple functions using a for command

Let's say I want to plot 10 graphs of those following functions. Since they are recursive functions, I cant make a table with 10 different initial conditions because Mathematica stores each value ...
4
votes
5answers
335 views

How to join two strings one of which is Subscript? [duplicate]

If I write this one str=Subscript["x","y"]; StringQ[str] False How can I get str as string?
3
votes
1answer
217 views

How does Mathematica use system environment variables?

Is there a common way in which environment variables are accessed, stored, or used by the kernel? There are built-in functions for querying and setting vars in the system environment, but there are ...
1
vote
2answers
200 views

Problems opening a notebook in Mathematica

Reviewers: please see the comments below my answer for additional information on why the edits were made. -bobthechemist I have a text file (with a .txt extension) written for Mathematica, but ...
3
votes
4answers
255 views

Tooltip with ListLinePlot and interpolation

Is it possible to get the coordinates of any point on a graph using Tooltip, ListLinePlot and interpolation ? For example on this simple example ...
8
votes
6answers
2k views

Check if two lists are equal in any order

Suppose I have two lists, how can I efficiently check if the two lists are identical up to permutations of the elements? For example I would like the function to output: ...
2
votes
2answers
157 views

Change Temporary Directory

How to change the value of $TemporaryDirectory ? I need to change it because there is not enough space on the C drive and the calculation seems to stop after a while !
4
votes
2answers
334 views

Equation of a transformed (roatted) ellipsoid

Given an ellipsoid with semi-axis {a,b,c} and cantered at {a,0,0}, how do I use ...

15 30 50 per page