# All Questions

47 views

### Will custom fonts in my notebook be carried over?

In my notebook, I have Open Sans (a free font) as a text font and Consolas (a paid font) as a code font. Those fonts are coded into the stylesheet of my notebook. My question is: if I send someone a ...
493 views

### Creating a 3D List Line Plot From Discrete Points

Given the following Runge-Kutta ODE solver and the graphical output below, how do I get a 3D line plot instead of a 3D point plot? I see that there is no ListLinePlot3D function, so I thought it might ...
100 views

### Use only exponents (no radicals) in output expressions

Radical symbols ($\sqrt{\,\,\,\,}$) are the devil. Is there any way to get mathematica to never use them, and instead express everything as an exponential? i.e. I want ...
48 views

### How to include automatic references to cells styled with DisplayFormulaNumbered

Under the Style menu, there is an entry called DisplayFormulaNumbered. It does exactly what it seems to suggest: it indexes the ...
144 views

### Syntax highlighting conflict

I'm trying to syntax highlight this expression: x=$\sqrt{\pi }$//N and from various sources I've learned that x (the assigned symbol) belongs to context Global while the Pi and N belongs to System. So ...
103 views

### Remove singularity at zero from $-((i^{-n} (-1 + i^n)^2)/(n^2 π^2))$

The expression h[n_] = -((I^-n (-1 + I^n)^2)/(n^2 π^2)) is real for all integers n. Although indeterminate at ...
300 views

### Why does Equal[“string”, False] not evaluate to False?

Why does Equal["string", False] not evaluate to False? I would have thought Mathematica could prove that these two things are ...
323 views

### How can I construct a distance table?

I have a list of city names (of arbitrary length), f.e. c = {"BAL", "NYC", "LAS", "AUS"}; and the distances between them : ...
85 views

### Invisible characters being inserted into the output from FindMaximum

I have been using Mathematica for quite some time but I have never seen anything like this. It started without warning and I am not sure how to fix this. Please have a look at the following example ...
96 views

### Why do two roots of my equation disappear when I give numerical values to two parameters?

Consider the equation ...
151 views

### How to modify font for all text fields?

I know that one can modify the StandardForm style so that all input and output codes (and maybe other things too) follow that style. This makes it tricky to make input code different from output code ...
131 views

### How can I make my plot continuous?

Looks like plots became of low quality in Mathematica 9? How to make Mathematica to plot continuously? Logically current plot style is solid.
266 views

### Finding all sets of elements with two common elements in a large dataset

I have a very large network of atoms ($\approx 10^6$ atoms) with fixed positions that resemble a cellular structure: I have two files including: fixed locations of each atom set of points which ...
33 views

### Manually launching remote kernel results local process frozen

I'm trying to launch a Linux (Ubuntu latest) machine as a slave of my local PC (Windows 8). Both machine have Mathematica 9 installed. However, I'm behind a router, so I think it's a little more ...
110 views

### Calculating the conditional probability of discrete samples

I have two lists: a = {0, 1, 1, 1, 0, 1} b = {1, 0, 1, 1, 0, 0} I'd like to calculate the conditional probability of a given b; for example, $p(a=1 | b=0)$. Is ...
62 views

### How I can define a new function as a function argument?

I need to pass a function with t as independent variable as a function parameter and want to create a new function of the same through this provided the argument of another function. Here is my code. ...
181 views

### Find equal elements on a list

Consider the following code to produce the sequence $x_1,\ldots,x_{n+1}$ where $x_i=11\cdots1$ ($i$ digits 1). Is there an easier way to do this? ...
97 views

### One-column table not properly displayed by TableForm

I want a table with a single column of data, and with headings along both the rows and the column. One might expect it to work like this: ...
123 views

### Animation of moving rectangles in 2D from data file

I am not very familiar with mathematica but I know the basics so I thought I give it a try. For a project I have to animate rectangles moving around in 2D (later also 3D). The data come from a C ...
274 views

### Negative probability?

I am trying to get the sum of the squares of seven random variables, all uniformly distributed. This is what I tried. ...
91 views

### Set all output to be of specific form

I want every output expression in a notebook to use //PowerExpand and also to format numbers as scientific. Is there a way to do this without explicitly calling ...
115 views

### Machine Epsilon

I'm trying to evaluate the machine epsilon of my computer (see below). I wrote this: ...
95 views

### How to find all possible correlations between n vectors

Given the Matrix ...
88 views

### ReplaceAll performance problem: packed arrays on the LHS are unpacked when the RHS is too long

The following is one of the most mysterious performance problems I encountered and came up while extending the booleval function mentioned here. I am looking for a ...
93 views

### FindRoot for numerical function and how to search more than one root

I have to find the first few zeros of function for which I have not the analitycal expression. The function is named f in the following code and it is the result of ...
55 views

### My “N” turned red randomly [duplicate]

For some reason my N function showed up in red even though I haven't noticed it in that color before. The color actually makes the code much more readable but I just don't know if I should be alarmed ...
112 views

### How to set initial guess in NDSolve

I'm trying to solve a BVP using NDSolve and I want to impose the starting initial guess. I googled and looked at the help, but I couldn't find this option. ...
116 views

### Finding the first five eigenvectors and values for a 500×500 matrix

I'm trying to find the first five eigenvalues and vectors of a matrix that has the following proporties: ...
74 views

### Suspend computation so it can be resumed even after the PC is rebooted

Sometimes a computation takes a long time. But when I sleep in the night, I want to shutdown my PC. Next morning when I wake, I want to start Mathematica and resume the computation. If you are ...
76 views

### Usage of Block in Compile

When is there an advantage to using Block in Compile? For instance, if I have a multiple-step code, how do I decide which ...
58 views

### Taking Mean for several elements of a list [duplicate]

i have the following question: Let us assume we have the following list: list={1.1,1.2,1.0,2.1,2.2,2,0,3.1,3.0,3.2} I need a function that always takes three ...
101 views

### Custom operators; custom pattern matching with pure functions

What I'm trying to achieve in Mathematica is the creation of a binary operator whose operands are both pure functions over the natural numbers. The result of the operator should be another pure ...
66 views

### System of differential equations - solving for a constant

I will reformulate my question in the hopes it will be more intelligible. First, I defined the functions: ...
131 views

### Working with nested matrices

I have a matrix: A = {{a, b}, {c, d}} But each its element, itself, is another matrix too. ...
151 views

### How to load data into a Manipulate expression

I have data showing truncated octahedron geometry changing with time. How can I read those data into a Manipulate expression? To be specific, I want to manipulate ...
59 views

### Order imported files by their alteration date

Probably a very easy question, but I could not find the answer, so it would be very nice if you can help me: Let us say I have 10 files, all with the extension ...
348 views

### Speed up ContourPlot3D

I have two issues with the following code. (1) It executes too slowly. If I use "Speed" instead of "Quality" for PerformanceGoal, I get the speed but an undesirable delay in proper rendering of the ...
231 views

### Adding plot legends in version 8

I use Mathematica to draw the displacement, velocity, and acceleration of one point in a graphic. ...
495 views

### Any way I can solve this integral?

So, Mathematica can't solve it. Any workaround? \begin{equation*} \int_0^\pi \frac{1}{\sin\left(\frac{\theta}{2}\right)^\beta + 1} \mathrm{d}\theta \end{equation*} The code is: ...
61 views

### How can preserve my manual edit of an expression when exporting to LaTeX?

Context I would like to use the Mathematica front end to pre-process expressions before exporting them to LateX, for the sake of readability. Example Say I have this expression ...
155 views

### Function that is a good fit to the plot made with SmoothHistogram

How can I find a function that fits the plot from the SmoothHistogram function? For instance if I have data like this and plot a Smooth Histogram, how can I get a function that fits the plot? ...
94 views

### Solving differential equation - initial condition

I want to solve the differential equation: DSolve[{R''[ρ] + 2 /ρ R'[ρ] + (1 - (l (l + 1))/ρ^2) R[ρ] == 0}, R[ρ], ρ] This works fine and outputs: ...
93 views

### Better code for two variable fractal interpolation functions

I am trying to write code for 2-variable fractal interpolation functions using two iterated function systems and two starting functions (both $y(x)=x$) which creates a sequence of piecewise defined ...
84 views

### Mathematica Compiled Functions - additional functions

Mathematica supports an exact list of compilable functions: They are listed here: List of compilable functions. However, I would need to add the following functions: ToExpression, StringFreeQ, ...
102 views

### Plot A Function Of A Stochastic Process

I am trying to do something very simple in Mathematica 9. I want to play around with option pricing and for that I thought it best to use the new stochastic process functionality. So, first of all I ...
56 views

### Exporting a plot inside Manipulate - Update first, then Export

I want Mathematica to excute the first action inside the Button fully before executing the second action. In particular, look at the following plot which I want to ...
148 views

### Intersecting/Overlapping Image Elements Counts?

I have what I believe should be a relatively easy problem to solve that I have not been able to find an elegant solution for. I need to compare two binary 2D images and count if any of the elements ...
71 views

### How to generate a random signal consisting of the specified functions

Let's assume that I have some particular signal on the finite time interval which is described by function $f(t)$. It could be, for instance, a rectangular pulse with amplitude $a$ and period T; gaus ...