# All Questions

2answers
192 views

### Equivalent of MATLAB's “hold on” function

I'm making an animation where the number of iterations is known. I tried using Dynamic, as I prefer updating in real time over generating data before plotting. I ...
2answers
161 views

### Drawing Cylindrical Segment with Graphics3D

For a visualization I need a combination of 3 Cylindrical segments to visualize the incident, reflected and refracted beam of light at a surface. I got as far as the following code. ...
1answer
108 views

### Why is this code in functional style is slower than procedural style?

I know that in Mathematica a functional programming style is often more efficient than procedural style programming using For loops. But the code shown below seems ...
4answers
291 views

### How can I return the color at a coordinate in an image?

I have an imported and cropped image: TestPicture = Import["filepath.jpg"]; TestPictureCropped = ImageCrop[TestPicture, Min[ImageDimensions[TestPicture]]]; How ...
2answers
73 views

### Why will my plot not generate my entire plot?

I am trying to plot a sum of multiple HeavisidePi functions. A typical example would be something like this: ...
1answer
44 views

### How do I access the binary matrix underlying an EdgeDetect output?

Applying EdgeDetect to an image generates a black and white edge-detected image, which I suspect corresponds to an underlying binary matrix. How can I access this ...
2answers
89 views

### How can I define a function which is the sum of other functions?

I have a function which is summation of another function over different i,j iterators. U[r] = Sum[V[r, i, j], {i, 1, 5}, {j, 6, 10}] and ...
3answers
112 views

### Finding max, min, and closest root of two dimensional data

I have some data that is two dimensional (traditional (x, y) format) as so: var = {{x1, y1}, {x2, y2}, {x3, y3}} I would like to search through that large list ...
5answers
229 views

### Multiplying two dimensional data by a constant

I have a list of lists of the form: {{1, 2}, {2, 4}, {2, 8}} But I want to multiply only the second dimension of that data by a constant. I know I could do this ...
1answer
476 views

### How to compare power towers in Mathematica?

First I tried it directly, but it overflowed: ...
0answers
43 views

### Decimal representations of analytic values in an expansion

I have a solution to an ODE (which I call sol), which I would like to expand in terms of Log[1+x] around x=-1. I thought that: ...
0answers
68 views

Can I customize the In[] and Out[] headers? I'd like to add $UserName, ... 1answer 62 views ### How to make a notebook not savable? How to make a particular notebook not savable? Optionally, how to do this by evaluating a command in the notebook? 1answer 93 views ### Dynamically labeling a family of curves [duplicate] I have created some simple code which generates a plot. This plot contains a family of curves created by changing a single parameter "k". I use the Table function within the Show function to iterate ... 2answers 60 views ### Font size in PlotLegends, using Table to generate the list in the legend I am currently trying to get to graph with several functions as below. My problem is that I cannot change the font size in the legend (authomatically generated numbers by "Table" function). This code ... 1answer 217 views ### Why can't I change the value of MaxRecursion in NIntegrate when integrating BesselJ? I am trying to evaluate this integral numerically $$\int_0^{\infty } J_0(q R) \tanh(q) \, \mathrm{d}q$$ for large values of$R$. This makes the integrand oscillate more quickly and Mathematica ... 2answers 107 views ### Correct use of ListInterpolation I have a small problem with ListInterpolation. I want to use ListInterpolation to postprocess result of a numerical simulation. ... 1answer 92 views ### Unset variable by its name given as a string Unlike the function Clear, the function Unset does not work for string patterns. Given the name of a variable as a string, how can you unset the corresponding variable? Example: Given: ... 3answers 147 views ### Symbolic manipulation of functional form I have a functional polynomial expression of the form: ... 0answers 116 views ### Mathematica Rlink [closed] I am trying to run a series of computations using RLink. First I initialize the tools I need: ... 1answer 97 views ### String replacement to make the TeXForm output beautiful This question is inspired by this question: How to convert the symbol$d$in Integrate into$\mathrm{d}$?. Although it’s not a big problem, the TeXForm can be ... 2answers 99 views ### Count and plot the number of solutions in an interval I have equations depending on one or more parameters and I want to find and plot the regions in the parameters space in which there are a specific number of solutions. For definiteness let's ... 0answers 64 views ### Using perpendicular offsets in FindFit I want to use perpendicular offsets in the built-in FindFit function. Are there any possible ways or do I have to code everything by myself? 1answer 167 views ### Why is arithmetic faster for inexact arithmetic? I have been trying to compute eigenvalues of a rather sizable matrix A, about$500 \times 500$(but sparse). I asked Mathematica to compute ... 0answers 79 views ### How to make the imaginary part of a +0. I zero globally? Values like a +0. I are really annoying. Answers from How to reduce expressions with complex coefficients in the form of a+0.*I？ Is there a way to globally set when to treat a very small number as ... 1answer 93 views ### why there is a small imaginary part [closed] I encountered a problem. I have a eigenvector eigvsI[1] ... 2answers 73 views ### What's wrong with my calculation of the expectation of the Laplace distribution? ... 1answer 71 views ### Why can't I change the style of a cell repeatedly? I ran into this when I was working with an example from the Help Pages of V9. Cells is a new function added in V9. The following appears to work the first time it ... 1answer 70 views ### How to increase precision:$MinPrecision does not help

I have the following series: ...
0answers
36 views

### Multiple screens support for slideshows

I really like using Mathematica for building slideshows/presentations. But is mirroring the only way to see the content both on the laptop's screen and on the projector? When using screen mirroring, ...
1answer
77 views

### Labelling Curves Using ListLogLinearPlot within DynamicModule (So Close)

I currently have a large number of time-series datasets in the form where the name and time-series transposed data, so I have a list of lists of names for datasets and their time-dependant data. The ...
4answers
191 views

### Importing or reading data in binary format 212

I have a binary data file in format 212, and I want to import the file into Mathematica. How do I read or import binary format 212? I almost have no direct experience of working with any binary ...
1answer
74 views

### Finding n-th term of a sequence of functions

Lets say, I have the following series of functions, $f_1=a+1$ $f_2=a^2+2a+1$ $f_3=a^3+3a^2+3a+1$ Assume that $f_4, f_5,$ and $f_6$ are also known. However $f_n$ is not known as a function of $n$. ...
1answer
86 views

### Does LinearModelFit perform an ordinary linear regression (least squares)?

Does LinearModelFit give an ordinary linear regression? I see lots of options, but nothing like "least squares" or OLR.
1answer
82 views

### How to calculate this integral? Integrate[BesselJ[0, x - BesselJZero[0, 1]]/x, {x, -Infinity, Infinity}]

I tried to calculate the following integral, but it returned unevaluated. ...
0answers
52 views

### Put webMathematica folder outside Tomcat webapps folder?

Is it possible to put the webMathematica folder outside the usual Tomcat webapps folder and still have webMathematica work? ...
0answers
36 views

### Scaled ColorData Function [duplicate]

I have a four-dimensional array c, in which the first dimension represents time and the other three dimensions represent (x,y,z) ...
0answers
38 views

### location of csv file when importing [closed]

I am trying to import csv file to mathmematica. However, when I tried to import, Mathematica was not able to find the file (see below). Do I have to move the csv file to the specific position? ...
3answers
93 views

### Sync Animated Plots

Here is my Lorenz code: ...
0answers
64 views

### Most CDF displays in browsers suddenly became grayed out [closed]

Suddenly, starting May 5th, most CDF displays on Chrome and Firefox became grayed out. This problem occurs for the displays in my blog (old ones and new ones), and displays of Wolfram Demos from their ...
1answer
80 views

### Remap Ctrl+Space?

The Ctrl+Space keyboard shortcut is really important in Mathematica for using Placeholder[] boxes in input templates. Unfortunately, Ctrl+Space occupies the ...
0answers
106 views

### Parallelizing is much slower than single kernel evaluation?

Starting with a vector of matrices, tVec, I would like to parallelize the multiplication of each element with the same matrix ...
1answer
57 views

### How can I assign specific colors and sizes to 2D coordinate arrays being plotted with ListLogPlot?

I'd like to plot two sets of coordinates in two different arrays using ListLogPlot, and be able to individually specify the sizes and colors of the datapoints for each array. Things seem to work ...
2answers
82 views

### Import matrices side-by-side separated by TAB

The problem is 0(TAB)0 interpreted falsely as a dark red square although it should be a dark red square surrounded by zeroes/ones. Import has different data-formats ...
2answers
176 views

### Working with a database

I just started to work with a database through Mathematica. I have a large data set. I use an .mx file to store my data. Now I have to store the data in a database, ...
1answer
96 views

### How can I change the size of the plot markers

I use ListPlot in order to plot four sets of data and also insert legends in my plot. Here is the Mathematica code ...
0answers
54 views

### Command to get License Management Monitor info

Using Netlink, when we have more users than Mathematica licenses (used in a pool), we get messages such as: Error code: 11. Connected MathLink program has closed the link, but there might still be ...
0answers
53 views

### Is it possible to create a styled cell with some dynamic contents

I'm making a personal templalte/stylesheet, Let me explain my question use the [correspondence] sytlesheet： Create a New Cell, Alt+1 or Alt+Shift+1 (windows system shortcut) set the Style is ...
1answer
79 views

### How to manipulate a Fourier sine series?

I would like to plot the Fourier sine series for $f(x) = x$. I would like to manipulate the parameter n from $0$ to $10$ and plot the sine waves over $(0,1)$. My ...
3answers
218 views

### Implementing the Farey sequence efficiently

There is of course the silly implementation: FareySequence[n_] := Union[Flatten[Table[j/i, {i, 1, n}, {j, 0, i}]]] However, there are numerous properties and ...

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