# All Questions

79 views

### Solving simultaneous systems of linear equations

I have several systems of linear equations in matrix form, and I would like to find the $\vec{x}$ that simultaneously solves them: $$A_1\vec{x} = b_1$$ $$\vdots$$ $$A_n\vec{x} = b_n$$ Is there a ...
53 views

### FindMinimum runs out of Memory

I have a function (its rather long, but does not matter) which when evaluated (1000s of times) runs fine. However, when I try to find its optimal parameters using ...
64 views

### C# Tree view similar

Is it possible in Mathematica to add a GUI like the Tree GUI element in Visual Studio 2010 C# Windows Forms? I want to have the similar feel
73 views

### Modelling the double pendulum using NDSolve

I have put in the two differential equations that govern the motion of the double pendulum into NDSolve, but according to Mathematica, the "input is not an ordinary ...
750 views

### Is it possible to draw really thin lines in Mathematica?

I want to have in Mathematica the same result I have in Python: I have this nice effect simply by using very thin lines. But it seems in Mathematica thickness property has some limit and i just got ...
33 views

### Trying to rotate a graphic over a field of parallel lines

I have a 10x10 grid of unit squares (picture a partial coordinate grid bounded by (0,0) and (10,10)) given by ...
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34 views

### Export “Print” command to text file

I am trying to create a text file with specific information in exact locations. This is my code: ...
65 views

### Where can I learn to use mathematica comprehensively? [duplicate]

I've heard great things about all the wonders and capabilities of mathematica. I've had the software for sometime now, but all I know how to do are simple calculations and stuff shown in the hands on ...
31 views

### Specify Frame pixel size in images [on hold]

I was wondering if there is a way to specify the Frame size of an image as opposed to using ImageSize? The issue is that we have several images we would like to ...
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### How to simulate the 2-D motion of a particle under uniformly accelerated motion? [on hold]

I have the following data: ...
32 views

### NonlinearModelFit indeterminate or not a list of real numbers

I'm trying to fit my data using NonlinearModelFit but keep getting errors that I don't quite understand how to correct ...
127 views

### How can I best plot timestamps by frequency-to-date?

I have a site called Sudomemo. I record when I first see a user in the database; and I've exported it in JSON format, located here. http://www.sudomemo.net/statistics/firstSeenDump.php I've done ...
97 views

### Why does LyapunovSolve solve non-standard form?

LyapunovSolve[A,Q] solves the equation $A P + P A^T = Q$ for $P$ whereas the standard form (wikipedia,lecture notes, p.25, linear control systems) of the Lyapunov ...
22 views

### How edit stylesheet to change automatic numbering of Reference type to numeric, not alphabetic?

I applied the stylesheet JournalArticle to a notebook. When I use the Reference cell style there, it automatically inserts "A.", "B.", etc., to number the cells. What exactly should one do ...
346 views

### Camel hump string split

Given System names of 2 or more characters: systemNames = Names["System`*"] // Select[StringLength[#] > 1 &] ; Is ...
93 views

### Visualizing subgraphs while specifying the locations of vertexes

I would like to visualize separate connected components of a graph defined by data points lying in the two-dimensional plane by surrounding each connected component subgraph by a bounding curve. I ...
64 views

### System of differential equations on a directed graph

I want to use Mathematica to model blood flow through a capillary network. The approach we are using is going to be to create a directed graph, and have a system of differential equations at each ...
24 views

### Upvalues and order of interpretation

I'm trying to use UpValues to improve the usability of some code, but I am running into an issue where the order of the UpValues is important, and I am not sure if it is my understanding or a ...
62 views

### How to disable multiple document interface (MDI) in Mathematica 10?

I want that there was no window-in-window interface. How to disable it?
38 views

### Generalized method of moments (GMM) estimation in Mathematica

As I was trying to get more help on implementing Generalized method of moments (GMM) estimation in Mathematica, I came across: Mark Fisher's Mathematica packages and notebooks If you have any useful ...
42 views

### Strange wiggles on the surface of a ParametricPlot3D

I'm trying to plot two cones but when I try to display them, Mathematica (10) makes the edges wiggly. My code is: ...
30 views

### Generate Degeneracies in List [duplicate]

I have a list with n entries and I would like to duplicate this list p times. In my case because of the Degeneracy of my Eigenvalues. For example I have {3,2,1} and it is five-fold-degenerate so that ...
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+100

### Developing a function of two variables from given data

Cross listed from MSE: http://math.stackexchange.com/questions/1029399/developing-a-function-of-two-variables-from-given-data (I believe Mathematica SE is an appropriate place to ask this, as well.) ...
132 views

### How to define a nested function like this?

For example, I want to calculate the limit of $\frac{1}{1+\frac{2}{1+\frac{3}{1+\ldots}}}$. So I want to define: $f(1)=1$ $f(2)=\frac{1}{1+2}$ $f(3)=\frac{1}{1+\frac{2}{1+3}}$ Then I calculate ...
36 views

### How to exclude a region from ParametricPlot

Suppose I have functions f[x] and g[x] which are defined in the region 0 ≤ x ≤ 1 and ...
387 views

### How to subtract one list from another, treating each elements as distinct?

Suppose that I have a = {"A", "A", "A", "B", "B", "C"} b = {"A", "B"} How can I subtract b from ...