12
votes
0answers
360 views

C Code generated from Mathematica not working?

I am a .Net developer. I'm trying to build a Visual C++ application using C code generated from Mathematica (by another person). I don't have Mathematica installed on my machine. When I try to compile ...
0
votes
1answer
124 views

Solving systems of equations and derivatives

I am new to Mathematica, and I'm not sure how to solve a system of equations that include differentiation. Given that f and g are differentiable functions: ...
1
vote
2answers
235 views

Is it possible restore initial values after modify a control in manipulate?

I used to program in Visual Basic, but in Mathematica I have not seen some kind of restore default values after any user modification command in the Manipulate ...
2
votes
4answers
185 views

Cancelling units in two-argument ArcTan

Consider ArcTan[3, -3] (* out: *) -Pi/4 ArcTan[3 a Sin[t/2], -3 a Sin[t/2]] (* out: *) ArcTan[3 a Sin[t/2], -3 a Sin[t/2]] However, we can fix the ...
4
votes
1answer
132 views

Missing V9 Menu: File -> New -> FreeCDF

I can run CDFs fine, and can export Notebooks as CDFs. But the File -> New menu does not contain a FreeCDF option, just the ...
1
vote
1answer
146 views

Need help defining my own rounding function

First of all: I'm a beginner with Mathematica. I'd like to define a function called Rounding which does the following: if for $x = n+a, n \in \mathbb{N}, a\in ...
13
votes
3answers
944 views

What is the most efficient way to map a linked list?

In order to work with lists effectively using common recursive patterns from functional programming, it's often most convenient to worked with the "linked list" representation, that looks like this: ...
10
votes
3answers
611 views

1D quasicrystal: points on a line nearest to points on a lattice

I have a simple lattice / line manipulation: ...
3
votes
1answer
99 views

Creating a parallelizable DiscretePlot

To my knowledge, DiscretePlot cannot be parallelized, although one can simulate the default behavior of DiscretePlot and get the ...
0
votes
1answer
229 views

Solving a system of two equations of third degree

I am trying to solve the following system of two equations for x and y. The solutions for x and y have to be positive and the parameters s and c are positive (to have a coherent interpretation of my ...
7
votes
3answers
569 views

Problems using hand-made transformation functions

I experience difficulties when using custom transformation rules. Below I give two concrete problems. I am interested in fixing each of them and in understanding what is wrong with my attitude to the ...
3
votes
2answers
251 views

Plotting a section of an hemisphere

I'm writing a little package in Mathematica for geology where a particular stone may be approximated as an hemisphere. Anyway this is a rough estimation because a real hemisphere has its height as ...
2
votes
0answers
78 views

Get correlation matrix when using FindGraphCommunities

Does somebody know how to get the correlation matrix when using FindGraphCommunities (Social Network analysis) using the "Spectra" option? Can somebody tell me as ...
2
votes
2answers
166 views

Using Mathematica to derive the PDF of the normal distribution

I am trying to use Mathematica, in this case in a well known and rather simple list of equations, but I get stuck whit Mathematica. Since I am just starting to use Mathematica for mathematical ...
1
vote
1answer
220 views

How to plot particular piecewise defined functions in mathematica

How to plot such functions in Mathematica? Let $a_0, p,g,c$ be any positive integers, defining: $$a_{n+1} = \begin{cases}\frac{a_n}{p} &, a_n \text{ divisible by p}\\ ga_n +c &, a_n \text{ ...
1
vote
1answer
216 views

Solution of Coupled Second Order ODEs with Boundary Conditions

D[Tu1[x], {x, 2}] qu - Tu1[x] (fu0 + I w p) == Tou[x] f1 D[T1[x], {x, 2}] q - T1[x] (f0 - b g0 + I w p)== To[x] (f1 - b g1) - g1 For T1 , ...
5
votes
1answer
135 views

What does LinearModelFit depend on except for its arguments?

I thought this would be always true, but most likely it returns false. ...
2
votes
0answers
53 views

How to reduce notebook or CDF file size with many images in it? [duplicate]

We love to use Mathematica notebooks to keep our notes, so we import lot of scanned photos into notebooks. However, the nb file size goes crazy large after importing photos in it. For example, ...
3
votes
1answer
180 views

Symbolically Expanding One-Variable q-hypergeometric Series

In general, how do I get Mathematica to symbolically expand various infinite series to an arbitrary degree of accuracy? I deal with q-hypergeometric series quite frequently, and specifically want to ...
3
votes
1answer
467 views

Need help with C Code Generator

I'm trying to use the Mathematica C Code Generator package to generate code that is to be included in a web application by a developer. I don't know any C, and this seems to be the only way to ...
0
votes
0answers
319 views

Problem with Plot and ParametricNDSolve

This is my first question on this site, I hope it is written in an understandable way. Let's start. My aim is to plot a certain parametric region, with $x$ and $y$ coordinates given by the following ...
3
votes
1answer
227 views

How to not include data value outside plot range in the plot

Consider this list plot ls = Table[Sin[t], {t, 0, 100, 0.1}]; p = ListPlot[ls, PlotRange -> {{0., 0.1}, All}, DataRange -> {0, 1}, Joined -> True] If ...
2
votes
1answer
108 views

How to use Maximize correctly

I would like to Maximize this fairly simple expression ...
0
votes
1answer
346 views

Simplify matrix into an upper triangular matrix

I have a tridiagonal matrix that I am trying to simplify into an upper triangular matrix using Mathematica, so I can use back substitution and solve my linear system. I have found the command ...
1
vote
0answers
59 views

Set-generating macro unexpectedly reaches recursion limit

One moment I decided to assign symbolic names to all special spaces since they all look the same when put literally in FrontEnd editor, more or less like "" or ...
3
votes
1answer
262 views

Writing loops for triangle elements

I'm kind of new to using Mathematica, so any help is great. I'm trying to write a program that will create a list or matrix that will give each small triangle's point numbers. For example if given ...
4
votes
0answers
132 views

Compiling/calling Mathematica-generated .so from C

I'm trying to call a compiled function from a C program. I am generating the static object ...
12
votes
3answers
2k views

Smoothing ListContourPlot contours

I have some data of type {{x1, y1, f1}, {x2, y2, f2}, ...} and want to do ListContourPlot. However, there is a problem that the ...
0
votes
1answer
101 views

Coefficient of function different than polynomial

My question arise from the problem that Mathematica can't solve the equation $$ \text{Solve}\left[e^{a-x} (0.0299584 a+0.1 b-0.0299584 x-0.152913)-0.9 a+0.9 b+0.9 x+0.18=0.0498614 e^{-x} \left(e^a ...
1
vote
1answer
92 views

Social Network Analysis - Get the List of InBoundEdges for Directed Graph

I wish to get the list of inwards edges for a node. IncidenceList provides both inwards and outwards list. I can of course filter with ...
6
votes
5answers
679 views

How can I name patterns in a Switch expression?

Suppose I have an expression and want to match it against successive patterns and return an expression corresponding to the first pattern that matched. In that case, I can use ...
16
votes
4answers
6k views

Plotting Fourier spectrum versus frequency of a signal

I have looked around here, and i am sure this has been answered, but i don't understand it. The thing is, I have taken a introductory signal processing course, and we had to use Mathematica, and i had ...
4
votes
1answer
289 views

PlotLegends and ImageSize

I have Mathematica 9.0.1, and I have problems with PlotLegends breaking the ImageSize directive. I defined ...
2
votes
1answer
233 views

Problem with Eigenvectors when given a matrix containing approximate numbers and symbols

I'm trying to diagonalize a certain 2 x 2 matrix, but Mathematica refuses to find the eigenvectors. In particular, when I input ...
5
votes
5answers
2k views

Label Markers On ListPlot

I would like to make a scatter plot where each element corresponds to a certain energy. Each plot marker should have its corresponding element next to it. IE. The data point at -1.16187 should have ...
6
votes
1answer
320 views

Can I enter the traditional form for Binomial as input in an expression?

Is there a way to enter the traditional form of a binomial coefficient, i.e. ${n \choose k}$ instead of Binomial[n,k], like I would enter a radical sign $\sqrt{x}$ ...
1
vote
2answers
187 views

How to fit exponential function which is not converging

I performed an experiment where I measured diffusion in a lipid bilayer. I performed the measurement by fluorescently labeling some molecules in the bilayer, and the irradiating them with light ...
2
votes
1answer
75 views

How can I get the functionality of a command ReplaceAllList?

I'm trying to use ReplaceList to match subexpressions. I expected the command: ReplaceList[{p, {p, p}}, {x_, y_} -> x y] to output two results, equivalent to: ...
2
votes
1answer
562 views

How do I get all possible solutions in an underdetermined system? [duplicate]

I have two problems which I'd like to solve with Mathematica. If I have a system of two equations with three unknowns, how can I get to list all possible solutions for the unknowns? Here is what I ...
3
votes
1answer
826 views

Solving a differential equation with initial conditions

I want to get a solution to an ordinary differential equation with imposed initial conditions. I'm confused about why my following code doesn't work: ...
2
votes
1answer
1k views

Non-numerical value for a derivative on NDSolve function

I am trying to solve the following system of differential equations: ...
2
votes
0answers
118 views

Filling -> Axis leaves a gap

Filling leaves a gap between the function curve and the axis ...
3
votes
1answer
218 views

Put random points into a specific 2D subregion

I want to cover a particular subregion of the x-y plane with a random distribution. As this particular region is not a circle I encounter some problems declaring the permitted zone where to put ...
1
vote
1answer
129 views

Why does evaluating an integral within a Plot expression take so long? [duplicate]

I want to evaluate Plot[Integrate[Sin[((1 + 1/2) x)] (1/(2 Sin[(x/2)]) - 1/x), {x, 0, t}], {t, 0, 5}] but it takes ages to load on Corei3 computer with ...
0
votes
1answer
298 views

DSolve does not give solution

No answer is given when I evaluate the following expression: ...
0
votes
2answers
138 views

How can I compute the real part of $\zeta^2$ numerically? [duplicate]

I want to compute and plot $\Re(\zeta(x+iy)^2)$ and $\Im(\zeta(x+iy)^2)$. How can I do that with Mathematica?
2
votes
1answer
284 views

Runge-Kutta-2 on System

After spending some time using the Mathematica documentation and this Mathematica.SE answer, I implemented the Runge-Kutta-2 routines. I am hoping someone can validate what I did and tell me that it ...
3
votes
1answer
1k views

Select row from a table by column value [duplicate]

I have the following: animals = {{dog, black, 200}, {cat, white, 100}, {moose, brown, 500}, {zebra,black,100}} If this came from a SQL table called animals, ...
1
vote
1answer
163 views

Another 3D plot question- good and ugly but no bad-

I have the following code with the intention to have a 3D plot: ...

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