# All Questions

43 views

### Numerical integration with large exponents

To make a long story short, I am doing mostly analytic calculations and therefore do note have good skills in numerical integration. I have to numerical integrate the following integral ...
46 views

### How to deal with error ndsdtc and indexss in NDSolve [closed]

I have a quiet complicated PDE and I want to solve it with NDSolve in Mathematica, but the software is giving me these two errors and there is no hint in the help ...
68 views

### Getting FerrersDiagram to work

I am trying to generate FerrersDiagram (see http://reference.wolfram.com/language/Combinatorica/ref/FerrersDiagram.html), any clues to getting it to work? I get error message for the following: ...
28 views

### No output from Plot3D when run from a script

Running Mathematica 10 on Ubuntu 14.04. When I run the following in the notebook it shows a plot. When I run the same code from a script (math < plot3d.test.m) ...
29 views

### Trouble definining a function to use only certain heads

I'm trying to write a function that accepts only a particular Head (for example, prints only Symbols) using pattern matching. However, the following code has me a bit of confused. ...
35 views

### SendMail fails to send zipped folder

I have run into a problem sending mail from within Mathematica. I can send attachments of most file types: .jpg, .nb, .xls, etc. I have run into a problem trying to send a zipped folder. I have looked ...
72 views

### Suppress extrapolation of interpolating function in a ContourPlot

I have defined an interpolating function, myfcn[x], valid on the domain x = 0 to 1.5. I am then using ...
226 views

### SortBy misbehaving?

It maybe a stupid thing in the end but I'm stuck a couple of hours now. I have a list of 2 points on the plane and I want to get the one with the biggest second coordinate. I thought I knew how ...
471 views

### a table of rectangles

I have code to generate this image: But my code is awkward and clunky: ...
63 views

### How do you (sanely) fix up data in a csv/table?

I have data in a CSV file I've Import[]ed. Some of the data needs fixing up - date formats changed, data normalized, etc. After fixing up I'll insert it into an SQL database. My CSV file has ...
70 views

### On plotting the Weibull distribution

First: How can I plot the Weibull distribution with parameters a = 2 and b = 3.5 on the range of ...
22 views

### Plot3D and NIntegrate issues

f[x_, y_] := 2*x - y Plot3D[f[x, y], {x, -1*Sqrt[4 - y^2], Sqrt[4 - y^2]}, {y, -2, 2}] NIntegrate[f[x, y], {x, -1*Sqrt[4 - y^2], Sqrt[4 - y^2]}, {y, -2, 2}] I ...
135 views

### Plot part of a circle

I want to draw a path of integration and I am facing the following problem. Given 2 point on the unit circle, draw all point of the circle that are left of the line the two points define. This is to ...
41 views

### Series expansion for rational function with weird powers of variable?

Consider the following series expression: Series[1/(a+b x^(1/3)+c x^(4/3)),{x,0,1}] The result comes out appropriately: 1/a - b x^(1/3)/a^2 +b^2 x^(2/3)/a^3 ...
71 views

### Square root estimation

I happened to read a something online about estimating a square root in a very simple way, known as Heron's method or the Babylonian method for square roots. The following (python?) code was included ...
133 views

### Graph showing valid English words obtained by insertion of single characters

I'd like the most efficient Mathematica code for making a formal tree graph whose nodes are valid English word strings (in DictionaryLookup[ ]) and directed links represent the relation 'insertion of ...
57 views

### Need some explanation of “Global*”

When I start a new notebook, I enter Names["Global*"] I get this {"list", "msgs", "rhs", "z"} Then I enter, ...
79 views

### Joining two lists with diverse properties [closed]

I want to make a list from two independent ones. ...
30 views

### how to use ParametricPlot with solution of NDSolve and other function?

I need to plot a hysteresis loop. For that purpose I solve corresponding differential equation with NDSolve command and now I need to plot dependence of the this ...
33 views

### Matrix clustering in Mathematica?

Suppose I have a square matrix $M$, which you can think of as the weighted adjacency matrix of a graph $G$. I want to order the vertices of $G$ in such a way that the entries of the matrix $M$ are ...
40 views

### Faster way to use Solve in a multiple parameters function

I have a complicated function, G, of several arguments: $G[{\lambda1,\lambda2,a,b,c,d,\sigma u,\sigma v,\rho,q}]$. First, I want to fix a=0.5,b=0.7,c=0.4,d=0.35, q=1. Then, I need to find the values ...
62 views

### Manipulate filters in arrayplot with graphical user interface

I have a set of images which need to be filtered by different filters. So I have made an interface in which the user can choose his or her filter. However I now want to manipulate the degree of the ...
107 views

### 2D Fourier transform of a few (4) disjoint discs on a plane

I'd really appreciate some advice. Short Version I'm trying to calculate the following  ...
48 views

### Number recognition in Mathematica [closed]

Suppose that I have a number $n$ with many decimal digits of precision. What is the code to use to get Mathematica to recognize possible closed-form expressions for that number?
35 views

### Troubles with ParallelEvaluate

I need to evaluate the same expression on all subkernels just like ParallelEvaluate does. This code distributes perfectly (2 kernels): ...
98 views

### Odd problem with Module

I've been having a strange problem with Module. Oddly it seems to be linked to my use of Import and then applying a function such as Flatten to my Import. I pasted images of my code and output ...
172 views

### How can we plot the complex roots of an equation?

If we'd like to display the $n$ roots of a polynomial on the complex plane as points, how can we do this? For example, if we have the equation $x^3 + x^2 + x + 1$, how can we plot the 3 roots as ...
157 views

### Using Cases to get elements in a list

I have the following list: ...
72 views

### How to compute an integral with 300 digits accuracy [closed]

I'm new to Mathematica and I would like to ask what is the code to use to calculate numerically an integral with 300 digits precision; also, I would like to know what is the right code to use the ...
94 views

### Finding the area bounded by a logspiral curve and two straight lines

I'm facing some trouble with finding the area of a region which is described by x-y coordinates (or line equations) and a curved line represented by logspiral. I tried my best in coming up with the ...
24 views

I'm attempting to import a PDF file into the Wolfram Desktop (though I have also used Mathematica 10 with identical results) on a Mac running OS X 10.9.4. The ...
64 views

### Custom plot range cropping

I'd like to plot two functions, say, Plot[{1 + Sin[x]/4, 10 + Cos[x]/4}, {x, 0, 10}, Frame -> True] Since their amplitudes are really small, I'd like to ...
36 views

### Second order nonlinear differential equation [closed]

I want to solve the following second order nonlinear differential equation in Mathematica, but do'nt know how. Please help. ...
99 views

### DownValue assignment using Apply

Why does assigning a DownValue using Apply, e.g., ...
78 views

### Mathematica output containing the variable name [duplicate]

Is there a way to have Mathematica automatically print the name of the variable during an evaluation when the semi-colon is suppressed. So for instance, Matlab would do this: ...
43 views

### No response when try to solve differential equations [closed]

DSolve[y'[x]==x^2,y[x],x] I just tried to solve a simple differential equation by the software, except for a the"Evaluation" blinked once, no response for my ...
41 views

### Write output to a file as well as showing it in my notebook

I know this is a bit vague, but I will try to be as specific as I can. Basically, I am looking for a way to save formatted output, like sink in R and ...
65 views

### How to combine TimeSeries of different dimensionality into TemporalData object?

I was wondering if it is possible to combine multiple TimeSeries data objects of values that have different dimensionality into one ...
100 views

### Sort eigenvectors of a list of matrices

I have a list of matrices and want to obtain a list of eigenvectors and eigenvalues for each matrix, both sorted by the size of the eigenvalue. If I write ...
29 views

...
55 views

### Does PrivateFontOptions -> {“OperatorSubstitution” ->False} fail in version 10?

Please consider the following, version 10.0.1, OS X Mavericks: ...
48 views

### creating a lattice using periodicity [duplicate]

i have 2 atoms A and B the coordinates of the A atoms are $r1A= (0,-2d)$ and $r2A= (\sqrt{3}/2 ,-d/2)$ the coordinates of B atoms are $r1B= (0,-d)$ and $r2B= ( \sqrt{3}/2,d/2)$ now i would ...
66 views

### Computer freezes during NIntegrate[]

I have a notebook that freezes the computer every time I run it (I mean the whole computer becomes unresponsive and do not react to ctrl-shift-esc and ctr-alt-delete as well as alt-tab and ...
35 views

I have a set of 8 points: [x1, y1, x2, y2, x3, y3, x4, y4] they are x y pairs. We see below that easeIn_right has start point of ...
54 views

### Taking derivatives

This is my code: X := g[P] P = a*t R = t*X FOC = Dt[R, t] This is what I get for the last line: ...
353 views

### Product of elements of a list

Sum is for functions; Total is for a list. Product is for a function; what is the command ...
23 views

### How exactly does ReplaceAll work? [duplicate]

I am not sure if this question has been asked before but anyway, Consider these two examples: ...
225 views

### How can I create a plot like this in mathematica?

I think this is called a caterpillar plot. The dot is the mean and the lines represent a 95% confidence interval. On the x axis there are several different test cycles, the red line is the true ...