4
votes
1answer
103 views

Figure with fill

I want to make a figure like this In Mathematica 9, to fill it with a grid inside (and necessary without part of the grid outside), but to generate this picture, I need to graph two semicircles and ...
3
votes
1answer
102 views

Finding pairs where the intersection of them is empty set from a nested list

It would be better to give an example first. Suppose I have a nested list of the form list = {{ 1,2,3,6}, { 3,6,10,20}, { 4,7,11}, { 10,20}}; where each element ...
3
votes
4answers
224 views

How to search for patterns to find the positions of prime numbers

I have a summation which yields a prime number at each location there is a 2, and I do not know how to search for the 2's. ...
0
votes
0answers
135 views

2d perspective projection of a sphere

I am looking for improved quality of 3d plots. I don't want to keep the object in Mathematica notebook - just export it to a .pdf file. Because it will be just one "side" of the plot I was thinking ...
0
votes
1answer
124 views

how to scale the plot of PDF (t-distribution)

The directions in my book say: "To sketch the t distribution in Figure 3.11, simply multiply the abscissa t value by the scale factor and plot this against the ordinate of t at that point." So ...
2
votes
3answers
139 views

Function like Cases/Select which also returns complement

I'm looking for a function similar to Cases or Select, but that also returns the complement of the resulting list. In other ...
0
votes
0answers
93 views

I have Mathematica, should I get Wolfram|Alpha Pro?

I have a nice and shiny Student license for Mathematica (version 10)! I also have an opportunity to get a discounted subscription to Wolfram|Alpha Pro. I love Wolfram language, and VNCing into my ...
16
votes
3answers
182 views

Resizing or moving Notebook window causes Manipulate to update its argument

Bug introduced in 10.0 and persisting through 10.2.0 Check this example: Manipulate[Grid[{{RandomReal[10]}, {Plot[Sin[x], {x, 0, 2 Pi}]}}], {a, 1, 3}] As ...
0
votes
0answers
111 views

running math file as batch job

I am trying to run the following mathematica program, ...
5
votes
2answers
254 views

Calculate area under a polyline

Consider the following code: tmp = {{0, 0}, {1, 1}, {2, 1}, {3, 2}, {1, 0.5}}; ListLinePlot[tmp, Filling -> Axis] Is there any easy way to compute filled ...
0
votes
1answer
91 views

WhenEvent for space variable

Can I use WhenEvent for space variable? For example ...
4
votes
2answers
197 views

Using GraphData to generate all directed graphs with n vertices

Using Combinatorica, it was possible to generate unlabeled (non-isomorphic) directed graphs of $|V|=n$. Here the example is for $n=4$: ...
0
votes
1answer
102 views

Using conditional expressions

I did: Solve[Cos[x] == 1/2, x] And got: ...
2
votes
1answer
96 views

Dirichlet convolution of two lists [closed]

The Dirichlet convolution of two arithmetic functions f,g is defined by $f*g(n) = Sum_{d|n} f(d)*g(n/d)$ How can I get the Dirichlet convolution of two lists? For example: Input: ...
-1
votes
1answer
100 views

How to get a 3D plot of from the the solutions of function [closed]

I have the following equation: (1 - x)^2 + T^2/((f[x] - L)*(f[x] - L - 2*T))*(P/(N-R+S)) == 0 f[x] = (x*r*(T + L) - T)/((x*r) - 1) ...
7
votes
1answer
182 views

Problem with DiscretizeRegion

Bug fixed in 10.1.0 ...
4
votes
2answers
95 views

NMinimize in one-dimensional Interval

An Interval should be a one-dimensional region, so a region. I tried to minimize a function over an interval, e.g.: ...
0
votes
0answers
56 views

Using NestList instead of Do [duplicate]

How can I express the following code using NestList: ...
14
votes
2answers
370 views

Messages leak out from Block

fixed in 10.1 When assigning message to a symbol localized by Block, I would expect that this message is not accessible outside of ...
0
votes
0answers
59 views

Modifying Game of Life code so that the lattice can be seeded with life forms

I want to modify Game of Life code so that the lattice can be seeded with one or two new life forms like: ...
10
votes
1answer
172 views

Copy Built-in function to new name

It is know that some built-in functions are system function and changing their properties may cause trouble. Suppose for example I want to change features of Cases: ...
0
votes
0answers
15 views

import part of data [duplicate]

I am using the following code for importing multiple files. ...
2
votes
1answer
61 views

How to fix the spacing problem using TeXForm for styling plots

Reference my old questions, How to use LaTeX for typesetting labels and titles in Mathematica and LaTeX and Mathematica. The problem is simple to explain. When I do this ...
0
votes
1answer
70 views

PDE raises NDSolve::ntdvdae, then kernel quits

In a related question, the SolveDelayed->True option seemed to solve the problem. SolveDelayed is not a valid option in M10 ...
9
votes
1answer
146 views

Slow work of SQLInsert with MS SQL Server in V10

This question is very similar to: Slow work of SQLInsert with SQLite, but for MS SQL Server. Unfortunately the use of SQLBeginTransaction and ...
0
votes
1answer
43 views

How to set a shared variable Power (a modified one)?

Unprotect[Power]; Power[0|0., 0|0.] = 1 ; Protect[Power]; Table[0^0, {i, 5}] No problem at all. ParallelTable[0^0, {i, 5}] ...
2
votes
1answer
140 views

SQLite and Mathematica

I want to connect to a local database with Mathematica. I used DB Browser for SQLite to create the database with a single table and then exported it locally as a .sql file. To access the database I ...
4
votes
2answers
109 views
0
votes
2answers
89 views

`Do` looping - break & output based on pattern

I have the following loop that I would like to stop after the pattern repeats & output cycle length: ...
6
votes
2answers
191 views

Efficient Lloyd Sampling of Images

I want to sample a grayscale image so that every voronoi cell contains approximately the same total intensity using lloyd sampling. My current code is kind of slow and I was hoping for some advice to ...
0
votes
1answer
47 views

Replace bunch of numbers by letter

I want to do following: ArcTan[1/Sqrt[-1 + (4 Sqrt[2] x^2)/(5 xc^2)]] /.4 Sqrt[2]/5->a^2 I expect to have ...
4
votes
2answers
217 views

Calculate PDF and CDF of a product of independent exponentially distributed random variables

Let x[1], x[2], ..., x[n] be independent random variables each of which is distributed exponentially, i.e. with the PDF ...
8
votes
2answers
88 views

Testing Notebook severe slowdown with newlines

I am having a severe slowdown problem with Mathematica 10 new Testing Notebook feature (File -> New -> Testing Notebook). Please try this simple test: Now introduce some newlines and try again: ...
5
votes
1answer
259 views

Function takes hugely different times to evaluate on sets of virtually (but also literally) identical data

I'm experiencing something which I believe to be weird with a function that I wrote. Briefly: what happens is that I generate random data to feed my function in two different but equivalent ways ...
1
vote
0answers
53 views

Build expression interactively

I define two lists: ...
0
votes
1answer
72 views

Mathematica function to generate a different 4 digit number [closed]

I m looking for a function that permit me to generate a different 4 digit number (>0) each time (to 4^10 possibilities) corresponding to a parameter that will never be the same (like current ...
0
votes
1answer
89 views

Plotting results of a NSolve problem

I am calculating, numerically, the zeros of a determinant. a1 and a2 are constants, q is a parameter. I would like to vary q and find the roots w as a function of q and plot roots w vs. q. All ...
0
votes
0answers
63 views

subtlety of self-defined function and its evaluation [duplicate]

I wrote a simple code as follows f[x_,y_]:=NIntegrate[x+z,{z,0,1}]; g[x_,y_]:=NIntegrate[y+z,{z,0,1}]; VectorPlot[{f[x,y],g[x,y]},{x,0,1},{y,0,1}] then ...
0
votes
1answer
80 views

Having trouble displaying imported Excel regression data [closed]

The plot points and residual lines are not showing, hard-coded data works, and imported data does do something, just not what its supposed to Is the table or the plot range the wrong size? I can't ...
1
vote
1answer
321 views

Code efficiency improvement needed solving problem 499 in Project Euler

I am trying to solve https://projecteuler.net/problem=499 by constructing a transition matrix and finding its steady state. Here is my code: ...
4
votes
2answers
180 views

Why can't a Plot be rendered by Graphics if it's a member of a list?

I grabbed the code to render a gear from a Mathematica Demo, but I'm having difficulty reproducing the way it's to be used: ...
1
vote
1answer
77 views

How to paste matrix to website and Email?

I tried to copy matrix from Mathematica to website, only end up with lots of garabge like this: ...
1
vote
0answers
24 views

Assign to variables inside Array, rather than changing array entries [duplicate]

I am generating an Array with symbolic coefficients: coefficients = Array[c, 3] > {c[1], c[2], c[3]} I would like to assign a value to each of these generated ...
1
vote
0answers
84 views

Smart pointer for Mathematica?

Would the implementation of the smart pointer idea be possible in Mathematica ? Let's say I have an object "o" of the form Class[object] where object is an Association, and Class has the HoldFirst ...
0
votes
2answers
157 views

How to write Newton-Raphson module and return a value?

I am writing a code which solve nonlinear algebraic systems via Newton-Raphson algorithm. I want to make a Newton Module with another file and use the Module in my test file, but i didn't achieve it. ...
8
votes
1answer
202 views

Plot that draws a dashed/solid curve depending on the y-value of the curve

Kind of as an extension of this question: How to plot a series using different colors depending on the y-value Is there something similar to MeshFunction or ...
2
votes
1answer
84 views

Problem with ParallelTable

The following code creates an array of length N, such that the sum of elements is less than or equal to p and each element is between 0 and l. All elements are integers. (code courtesy, Kellen Myers ...
2
votes
0answers
34 views

How to start a remote kernel on a machine with two ip addresses?

Suppose I have a local machine with ip address 204.XX.40.10 and a remote machine. And the remote machine has two network card, so it has two ip addresses: 204.XX.40.21 and 192.0.2.100, and only the ...
1
vote
1answer
84 views

MatrixPlot Styling

I like to build a colour sequence from a list. Each value has a corresponding colour. I used MatrixPlot to do that. I have two question concerning MatrixPlot styling. Code: ...
3
votes
0answers
51 views

How can I make a stylesheet that counts subcells?

The example cells in the documentation each have count of the cells inside their section: ...

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