0
votes
0answers
18 views

Find Vertex of Parabola

A Frisbee is thrown straight up in the air from a position 2 m above ground level. Because of the wind pattern, the height, h, in metres, after time t, in seconds, is given by the formula H = 2 + 6t – ...
1
vote
1answer
14 views

Calculate pixel intensity in two regions

I am just beginning to learn about image processing. I would like to know 1) how to show an original image with a visible mask of an arbitrary shape. And how to calculate the pixel intensities in the ...
0
votes
0answers
13 views

Function to calculate finite difference

I wrote a function to calculate multivariate finite difference of different orders ...
0
votes
0answers
21 views

Any approximations in EulerEquations?

I am using the Lagrangian method so I can numerically solve for the equations of motion for the double pendulum. It's been done by hand a million times and in every derivation, small angle ...
1
vote
3answers
94 views

Replace all integers by 1?

Let list1 be a list of variables of the form {c1 a, c2 b, ...} where $a,b,...\in\mathbb{C}$ and $c1,c2,...\in\mathbb{Z}$. I am ...
0
votes
1answer
18 views

There is an higher probability to win with 3 dices versus 2 or with 4 dices versus 3?

In Dice wars, you gain a territory rolling the dices you have in an adiacent territory (almost like Risk game). If I have more options to choose, there are more chances to win with 3 dices versus 2 ...
2
votes
1answer
12 views

How can I use parts of lists with Dynamic?

I'm a newbie - what am I doing wrong? I want to use parts of lists (vectors) in calculations but Mathematica will not evaluate anything that involves parts of lists that update dynamically. Is there a ...
1
vote
1answer
25 views

Breaking out of NDSolve

I am solving a coupled set of differential equations with NDSolve for 6 unknown functions of time. At a certain point in time, the system hits a singular point where the potential governing the ...
1
vote
1answer
32 views

Why `Plot` does not obey the `AspectRatio` specification?

I am plotting the density function of a beta distribution and I specify that aspect ratio should be one. I expect the x and y axes should have the same scale (unit length), but it turns out not. How ...
0
votes
0answers
19 views

Why First (or Last) and Take are distinct functions?

I think it would be better to make First take an optional second argument, so that First[list,n] is identical to ...
2
votes
0answers
31 views

Building bounded polygon around heatmap (or points)

I have a set of data for world marine piracy. I'd like to build polygons encircling areas of active piracy. So to start with I get piracy data and make a heatmap from it. ...
0
votes
0answers
19 views

SubsetQ returns unevaluated

I am using Mathematica 10.0.1.0, on Ubuntu 14.04.1. Executing SubsetQ[{1, 2, 3}, {1}] returns the same expression unevaluated: ...
0
votes
0answers
10 views

Again about a function defined by NIntegrate

I've looked on several similar questions but without success. Suppose I need to do the following (this is not a real problem, but only a scetch where an error appears): let $$(Kv)(x,s,t)=\int_s^t ...
2
votes
0answers
37 views

Visual representation of a Ranking over time (image provided)

[Disclaimer: I initially posted this question on stackOverflow 2 months ago and think it might be better suited for this forum (Original post: ...
1
vote
2answers
217 views

What quantity is this “length” called?

tmp = {x, y, z}^{1, 2, 3} Times @@ tmp Length[%] This gives a length of 3. But I was expecting 1. What is exactly this "length" of x*y^2*z^3 called? I would ...
1
vote
3answers
80 views

Matrices and Combination

When the positive integers 1 to 9, inclusive, are used exactly once as elements of a 3 x 3 matrix, what is the largest possible value of the determinant of the matrix?
0
votes
2answers
40 views

Custom list plot ticks

Not as exciting as the buttocks question, but ... For some list log plots, it is faster to calculate for certain log values. eg: ...
2
votes
1answer
32 views

Deferent results depending on the input form of the matrix [on hold]

Why is it so, N[Eigenvectors[{{1., 0.5, 4.}, {2., 1., 2.}, {0.25, 0.5, 1.}}]] returns: ...
4
votes
0answers
36 views

Combine Stereographic “Entity” Plot of Arctic Sea with Contour Plot

In the announcement of Mathematica 10 there were some very cool features for every geo-related researcher. Like this one what i'm trying to do is to overlay an ContourPlot onto this beautiful arctic ...
1
vote
1answer
62 views

Column Division

I'm new at Mathematica. I need to find all the reminders of a division between two integers - just like column division - and stop until I obtain a reminder equal to one of those already found. For ...
1
vote
3answers
54 views

List Manipulation Via Conditionals

I'm trying to convert one list to another by applying a condition on the list's elements. But I can't figure out how to do this in mathematica's language. Python example below ...
0
votes
1answer
24 views

Convert Dynamic to Manipulate

The following code is a modification of Wolfram code I found under ClickPane Help. I want to convert from Dynamic to Manipulate to make it easier for me to add various controls. I do want to keep the ...
0
votes
0answers
47 views

Blank sequences do not display anymore as continuous lines

BlankSequence[] and BlankNullSequence[] "suddenly" do not display anymore as "continuous lines" in my v.10.0.1 (OSX) (of course ...
5
votes
1answer
68 views

How to share `LineLegend` among sub-figures in `GraphicsGrid`?

Using GraphicsGrid, I have put two figures that share the same x-axis in a row. However, I failed to let them share a common ...
0
votes
0answers
33 views

Using N with Eigenvalues [on hold]

I'm calculating eigenvalues of matrices. The problem is that it works for some parameters and not for others. The output in my .dat-data has #1 [other stuff] #1^2 ...
4
votes
0answers
44 views

CDF Player - MMA9 - MMA10 oddities

I'm (slowly) building a WordPress site with some didactic simulation made with Mathematica. Users can run the simulations (on-line or off-line) with the free Wolfram CDF Player. One of the last ...
4
votes
1answer
28 views

The specified setting for the option FEFloatIterator cannot be used

I am currently trying to get a numerical simulation running where one variable is iterated over many orders of magnitude. As the calculation takes pretty long, I would like to display a ...
2
votes
1answer
53 views

How to prepare a Mma expression to insert it into Comsol?

Preamble Sometimes I have to solve nonlinear PDEs using Comsol. Often these equations I already have in Mma, written in a Mma notations. For this reason I would like to be able to transform them so ...
50
votes
4answers
14k views

How do I draw a pair of buttocks?

I'm trying to develop a function which 3D plot would have a buttocks like shape. Several days of searching the web and a dozen my of own attempts to solve the issue have brought nothing but two ...
1
vote
1answer
96 views

Finding the index of (x,y) pairs in a list

I have a large list of $(x,y)$ pairs, and I want to find the index of a particular pair in order to extract some data from another array. By way of an example, ...
0
votes
1answer
54 views

Plot multiple solutions [duplicate]

I want to plot multiple solutions of an equation, so that one can differ them in the plot. The given equation is e.g. ...
0
votes
0answers
30 views

Are there any build-in or third-party packages for general topology or algebraic topology in Mathematica?

I am learning general topology (wiki) and algebraic topology (wiki). Are there any build-in or third-party packages for general topology or algebraic topology in Mathematica? Through googling, ...
1
vote
2answers
46 views

How to Hold/Defer only one (only given) level?

Is it possible to Hold/Defer some of outer expressions, having evaluates inner ones? For example, I want to prepare a table of expression values, like this ...
0
votes
1answer
91 views

Physics Lab with mathematica [on hold]

Well, I am very new at Mathematica. I have some datas from my physics Laboratory. I used to use physplot, a simple program to plot data points,but now I want to use Mathematica to plot those points, ...
0
votes
0answers
18 views

choose a WSTP program to launch

When I run an external program(compiled by Visul C++ 2012 in windows 7) to use the wolframkernal by WTSP, for example:project1.exe -linkmode launch,it will open a dialog box named "choose a WSTP ...
0
votes
2answers
59 views

Turn a string into a list of strings [on hold]

Is there a way to turn a series of letters, say: "kspe" Into a list composed of strings (not variables) in the form of ...
0
votes
1answer
33 views

Composition of Multivariable function

I am trying to compose functions of xleft, maybe like xleft[xleft[f]] or even higher order. And here is my function: ...
4
votes
0answers
49 views

How to make Graphics3D with multiple lighting sources being rendered faster

I have a very "precise"(through setting "SpherePoints") Sphere illuminated by hundreds of random color lighting sources. The ...
4
votes
2answers
160 views

How can I import and split lines with ASCII separator?

This is my data file, each line was separated by SOH, maybe hex \x001, I've tried some options of ...
1
vote
2answers
65 views

How to turn an expression into a number

I am working with a function that computes the covariance between two variables. After computing this, I'd like to use Plot or Plot3D to see how this covariance depends on the parameters of the mean ...
1
vote
1answer
49 views

how to make interpolated data as a function?

For example, data1 = 0 1 1 2 3 3 5 2 6 2 9 4 11 5 13 6 14 7 16 8 data2 = 0 2 1 3 2 2 3 1 4 2 6 3 8 4 9 6 11 4 16 7 each data have different x-axis interval. so ...
0
votes
0answers
52 views

How do I use an offset with Parametric Plot?

This is a line of code from a Mathematica demonstration called "Coupler Curves of a Four-Bar Linkage". ...
1
vote
1answer
41 views

How to export a ParametricPlot3D as .stl for 3D printing

I am a attempting to render and export a model lorenz attractor to .stl using Mathematica, so that I may 3D print it! I was able to come across a notebook (from a deeper end of Mathematica than I swim ...
0
votes
1answer
47 views

Why `Delete` does not work?

I'm trying random thing in Mathematica just for learning and I can't solve this problem. I want to use the Detele function to delete some elements in a list but ...
3
votes
0answers
39 views

Parallelization and memoization? [duplicate]

I have an expensive function on discrete values, f[n_] := f[n] = n^2 (* Expensive calculation *) Since f[n] is an expensive ...
1
vote
0answers
44 views

Is the “Table” function limited in number of elements it can compute? [on hold]

i tried using "Table" to compute a list of 400,000 strings but the output takes forever to get. I have tried with smaller size of about 100 and i get results as fast as possible. But when the number ...
1
vote
0answers
19 views

Parsing RLink RObject for summary.aovlist

There's some slightly similar requests out there (e.g. Getting R textual output into Mathematica ) but I'm wondering if anyone has put together a more general purpose solution to parsing ...
0
votes
0answers
33 views

Plot function producing no graph [on hold]

I am trying to plot this probability distribution but nothing is showing up on the axis: ...
0
votes
1answer
28 views

Using Loop to create mutiple EventHandlers

I have a problem, that is I want to use loop to create multiple EventHandlers, but my code shows nothing. What can I do? ...
2
votes
2answers
117 views

Cumulative histogram with log-log scale

How to do a cumulative histogram on Mathematica on a log-log scale? This question is pretty straightforward, but a search didn't help me at all. Keep in mind that all I have is a list of n numbers ...

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