1
vote
1answer
43 views

Axis Labels Disappear With Manipulate

I have a ListPlot3D with custom axis labels that I am scrolling with Manipulate. My issue is that the axis labels scroll away as ...
-1
votes
1answer
75 views

Is there a change in V10 with Solve and exponents?

I've encountered a strange problem with V10. I can't quite nail it down, but the Solve seems to be unable to solve equations that it could in previous versions. ...
1
vote
0answers
62 views

How to figure out whether a nonlinear inequality holds or not

I have an inequality consisted only of seven parameters as follows: $(1 + g)^{-(m+w)}\big[\big\{a+(1-a)(1 + g)^m\big\}(1 + p q)Q - (1 + g)^w \big\{(1 + g)^m (1 + q)-(1-p)q\big\} Q\big] < 0$ ...
3
votes
1answer
39 views

LibraryLink path problem

I have a library function that need to load some external data files. But it looks that the path in the default path of library function is the path that Mathematica is currently in. Is there a way ...
-3
votes
0answers
35 views

Write equation as a multinomial in the variables x and Sin[y] and extract the coeficient of x*Sin[y]^2 [on hold]

I need help solving this problem. Thank you. (a*x^2 + b*x*Sin[y] + c*Sin[y])^2 + (a*Sin[y]^2 + b*x)^3 Write the above as a multinomial in the variables x and Sin[y] and extract the coeficient of ...
1
vote
2answers
93 views

Integrating Squared of Interpolating Function with respect to one variable

I am interested in evaluating a two dimensional interpolating function produced by solving the wave equation. Here is the code that includes the resulting interpolating function. ...
0
votes
0answers
79 views

Defining a Gaussian Distribution Fit to data

I am given a set of data and told ahead of time that the data will need to be fitted to a Gaussian Distribution. I know that Mathematica has preset functions for linear, quadratic, and cubic fits, but ...
0
votes
2answers
46 views

Write the equation as a polynomial in x and extract the coefficient of x^2 [on hold]

I need help solving this problem. Thank you. (a*x^2 + b*x*Sin[y] + c*Sin[y])^2 + (a*Sin[y]^2 + b*x)^3 Write the above as a polynomial in x and extract the ...
7
votes
2answers
187 views

Attaching a legend to BallAndStick picture

I am looking for a way to add a legend showing the identity of various atoms (with different colours) to this picture. Any Clues? ...
1
vote
0answers
36 views

k-means clustering in parallel

How can the k-means algorithm for some given distance function be implemented using ParallelMap or other parallel processing program constructs in Mathematica?
2
votes
0answers
37 views

k-means clustering using squared correlation in Mathematica

I am trying to cluster data using the squared correlation coefficient since in the case of my data, -1 correlation is equivalent to 1 correlation (polarities do not matter). How can this be done in ...
6
votes
7answers
172 views

Join decimal part

I have a list of mesures that each vector is like {0,1,-2,259} but it should be like {0.1,-2.259} So I did a rule, like ...
12
votes
6answers
280 views

Finding all paths of certain length between vertices in path graph, non-simple ones too

First I will tell you what my ultimate goal is, because maybe there's another way of doing it other than what I am trying. I need a list of all $(a_1, a_2, \ldots, a_N)$ tuples that satisfy certain ...
2
votes
0answers
46 views

How to make a new analytic function work seamlessly with Mathematica's analysis functions?

I am defining a new analytic function of six variables. I have algorithms to evaluate it numerically, and have amassed a large catalog of analytic properties. It is easy for me to program the ...
3
votes
1answer
64 views

Inverse prediction function

I am trying to write a code which learns a data set. Now, I want to know the input value for a given output value. Consider, the following code ...
4
votes
1answer
42 views

Convert Locator (x,y) values to Lat/Lon as per GetCoordinates on Map

I want to convert the (x,y) coordinates you get from using a locator on a map to Lat/Lon coordinates - exactly like the GetCoordinates tool does when you right click on a map. ...
1
vote
1answer
66 views

How to checkpoint computations?

Suppose I do some big experiment, presumably in a Table[], or a ParallelTable[]. Experience shows that there is a non-zero ...
4
votes
3answers
111 views

Combining more than two lists by first column as index

Please bear with me. It might be easy but its been hard for me. I have say three lists: ...
1
vote
2answers
130 views

Plotting an orbit using first principles [duplicate]

I am fairly new to Mathematica, but I am trying to plot an orbit of the Earth around the sun using the equation: $\quad r(t+dt) = (2 - G*M*dt^2/r^3)*r(t) - r(t-dt)$ I need to break this into ...
1
vote
1answer
39 views

Running a Mathematica Notebook from command line and saving the output [on hold]

I am working on a project that requires some calculations to be done in Mathematica. I don't know Wolfram language and I don't have the time to learn it (I am using a 30-day trial) so I have a python ...
2
votes
4answers
104 views

Precision problem with numerical solution of a differential equation

I want solve $$ 2\sqrt{|\gamma|}x = \int_{1}^{t} dy \sqrt{\frac{1+2|\gamma_2|y}{y^2(1-y)}} $$ where $0<t\leq $1. I'm using a for cycle to evaluate t, calculate the integral and the assign the $x$. ...
2
votes
2answers
108 views

Histogram with variable bin size [on hold]

Suppose I have some dataset,e.g., Histogram[RandomVariate[PoissonDistribution[2], 10000], 10] which gives, $\hspace{2cm}$ How can I change the histogram such ...
2
votes
2answers
38 views

Column Operation - Subtract part of nested list from part of another nested list [duplicate]

I have two lists with x- and y-coordinates with different z-coordinates of the form {{x0, y0, z0_1}, {x1, y1, z1_1}, ..., {xn, yn, zn_1}} and ...
0
votes
1answer
70 views

StreamPlot in Mathematica

A $2\times 2$ linear ODE system can be visualized by SteamPlot in Mathematica. For example ...
5
votes
2answers
185 views

Counting Real roots

I'm interested on how to count the number of real roots of a random polynomials in an instant, how to put the result in a table and how to plot it in a graph.I generated 1 million random polynomials ...
-2
votes
1answer
59 views

Trouble to assign solution of differential equation to a function

I have written a function to Solve the following differential equation where the number n (called in my code Nphoton) is a variable. Nevertheless I have troubles to assign the solutions ...
6
votes
1answer
55 views

Taking the derivative of a function with indexed variables

I have a number of functions that depend on a variable x. I am using a second, integer variable to index these functions, i.e. something like ...
4
votes
4answers
181 views

Concatenating strings, unevaluated expressions and evaluated expressions/values

Maybe this is something very simple to some of you. Anyway, I think this can be useful to many others like me. I would like to build an output that involves strings, unevaluated expressions and ...
4
votes
0answers
140 views

Strange behaviour of MMA in derivatives of some standard functions

There are some peculiar things to be discovered in derivatives of some standard functions in MMA: Strange behaviour Example 1: Abs We have ...
2
votes
0answers
49 views

Listable on first level

I have some function which take List as input. f[l_List]:=someActions[l] I need apply this function to a list of lists. Now I ...
4
votes
0answers
37 views

Combining separate CHColorStructureDiagrams to form one molecular structure

I am trying to attach a fructose molecule to a sucrose molecule by using information obtained from the following ...
0
votes
0answers
13 views

How to calculate number of cards' permutations in card game [migrated]

I have trick taking based card game with 32 cards. Initially each player has 8 cards. After each trick number of cards in all players' hands are decreasing by one. I'm writing an AI Bot which knows ...
7
votes
1answer
67 views

How to get output from standard error in command line?

I'm trying to run some external command line program in Mathematica, and I have problem getting the output. For example, ...
6
votes
3answers
188 views

Speed of ConvexHullMesh

Pick $N$ random points on the surface of the sphere, then use ConvexHullMesh[] to compute their convex hull. Empirically, this takes time quadratic time in $N,$ ...
0
votes
0answers
39 views

Complex Numbers: need to find $\left | H(\omega ) \right |$ and the arg $\left | H(\omega) \right |$ of the following equation [on hold]

Let $H(\omega)$ be a complex-valued function of the real variable $\omega$. Find $\left | H(\omega ) \right |$ and arg $\left | H(\omega ) \right |$. $\quad \quad H(\omega) = ...
3
votes
2answers
87 views

Sublists of Random Permutations

What is an efficient way to create a list of (psudo)randomly chosen permutations? I'm trying to create a list like below: ...
1
vote
0answers
40 views

Set Frame Margin for Exporting Video File (.avi)

I have a question regarding setting the frame margins of exporting .avi file. I want to make a short video of some pictures I import using Table: ...
5
votes
7answers
686 views

What is the equation to plot a vertical line?

Please help. Trying to find area between three curves, e^-x, x = 2, y = 1. Can't find out how to plot x = 2. Don't want to use ...
0
votes
1answer
81 views

How to get an Excel-like surface plot with ListContourPlot3D

I'm trying to create an Excel like surface plot from an import of data from an Excel workbook. I get the data without issue. It is a set of percentages in bin ranges over a series of dates. I'd ...
1
vote
1answer
57 views
+50

Symbol resolution for contexts inside packages

Say I create $UserBaseDirectory/Autoload/MyPackage/init.m containing: ...
18
votes
4answers
868 views

Homotopy Visualization

I noticed that both the lower cased 'i' and the Apple logo  are topologically equivalent to the disjoint union of two closed discs. I'd like to animate a homeomorphism from the left to the right, ...
1
vote
1answer
43 views

ReadList or any other command to read in blocks of very large numbers

I have a data file, data.txt, having following data: ...
0
votes
1answer
33 views

How to use many global assumptions [on hold]

I would like to use many global assumptions. Say I have two global assumptions. $Assumptions = 0 < a < 1 $Assumptions = 0 < b < 1 Then I would like ...
1
vote
0answers
37 views

Problem with importing numbers resulting from an executed file in Mathematica

I am running Mathematica 10 and I have a mathematica file, MBdebug.m, that contains the line val = Import["! ./MBpart1ep0", "Table"]; MBpart1ep0 is an ...
1
vote
1answer
39 views

Strange behaviour of Set and Part when given a sequence

Consider this example: lis1 = {a, b, c}; lis1[[2]] = Sequence[e, f]; lis1 (*{a, e, f, c}*) lis1[[2]] (*e*) lis1[[2]] = Sequence[g, h]; lis1 (*{a, g, h, c}*) It ...
4
votes
2answers
48 views

DSolve results not what expected

I have the following formula: s'[t] == 230.94 Tan[0.914743 - 0.138564 t] When I solve this by hand I get: ...
2
votes
2answers
91 views

Retrieving coordinate positions using ChemicalData for input to quanutm modelling software

I am trying to set up an input file for a quantum chemical modelling software. How do I obtain the (XYZ) coordinate positions in Angstroms using information obtained using ChemicalData. Have some ...
2
votes
1answer
48 views

Mesh for points in 3D

I've got a set of Eisenstein integers (triangle lattice points in the complex plane), and I've selected them to be above a line, so that they form a triangle: I then took these 2D points and ...
2
votes
0answers
25 views

Compiled DiagonalMatrix

The standard function DiagonalMatrix cannot be compiled, so I tried writing my own: ...
0
votes
0answers
30 views

gridlines in a plot [on hold]

Please, someone to help me to abbreviate this commmand ContourPlot[{x^2 - 2 y^2 == 1, x^2 - 5 y^2 == 1, x^2 - 10 y^2 == 1}, {x, -15, 15}, {y, -15, 15}, GridLines -> {{-15, -14, -13, -12, ...

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