# All Questions

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### Asymptotic expansion on 3 nonlinear ordinary differential equations

The 3 nonlinear differential equations are as follows $$\epsilon \frac{dc}{dt}=\alpha I + \ c (-K_F - K_D-K_N s-K_P(1-q)), \nonumber$$ \frac{ds}{dt}= ...
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### Sqrt disappeared when exporting plot to PDF in version 10

In version 10, if we plot with Sqrt in y-axis, and export to PDF, the square root disappears in the PDF file. ...
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### EventLocator EventAction list specification using Table versus explicit list

I have an NDSolve problem that needs a list of a large number of events that are generated programmatically. Here is a simple example that demonstrates the problem on Mathematica 7 and 8 (the versions ...
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### Complex infinities in an Euler-Lagrange equation

I now wish to solve for $L(t)$ and $H(t)$ some ugly Lagrangian (in the code below) in configuration space, respectively the length and the height of a system. I tried running the code below, with the ...
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### Create a list of random reals

How can I create a list of random pairs $(x,y)$ where $0<y<x<1$ and $x,y \in \mathbb{R}$ ? I can't seem to place that inequality restriction on the random numbers that are generated.
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### One ChartLegend for multiple charts in Dataset?

Dataset's documentation shows how to leverage GroupBy operator at multiple levels titanic[GroupBy[Key["sex"]], GroupBy[Key["class"]], ratio, "survived"] Taking a ...
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### Can I use what “headerlines” removes from a CSV as TableHeadings for the table I create from that File?

I am reading in some data from a CSV file that has a line which gives titles to each "column". Here is an example: ...
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### Result of Integrate depends on order of integration although the domain is rectangular

The following: ...
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### Simplifying a symbolic product of rational powers

I'm trying to symbolically evaluate a lot of equations that can consist of up to 10 parameters. The form of these expressions is a product/quotient of rational powers of the mentioned parameters, ...
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### How to read from /dev/random?

I am looking to read a few bytes from /dev/random on OS X and Linux. The simplest approach fails on both operating systems (see below). Why? What is a ...
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### Possible bug in Dynamic

The code below crashes the Mathematica kernel in version 10 (not in V9) every time I run it on Windows and on Mac OS. I've sent it to WRI, but was told that they could not reproduce the crash. Does ...
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### How do I turn my verbal argument into something formal in Real Analysis? [migrated]

So one of the exercises I am doing is to prove (or disprove) that 'Every compact set on a metric space is bounded'. Verbally, I can 'prove' this by simply stating: "If the every compact set on a ...
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### How to transpose x and y axes on a LogPlot?

Consider the following simple LogPlot: LogPlot[Exp[x],{x,0,5}] Is there a nice way to switch the axes of a LogPlot? I'm aware that plotting the inverse ...
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### Extrude 2D cross-section to 3D shape with shrinkfactor

I would like to create a 3D shape from extrusion and scaling of a 2D contour. The 2D contour that I have looks like this: and it consists of a bunch of points (here plotted with ...
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### Security of the Wolfram Programming Cloud? [on hold]

We have a number of projects where we a contractually obligated to safeguard client data and intellectual property. Prior to using a tool or technology, we must provide documentation that shows how ...
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### Spike train representation

I have a spike train. The data shows the time at which the neuron fired a spike. I want to plot them like this picture: Here is the data for one spike train which corresponds to the one of the ...
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### why is mathematica 10 much larger than 9 in disk space? [on hold]

I found that mathematica 10 requires 8.8GB disk space while version 9 only asks for 5.5GB. So what are the major differences? What kind of new features gives rise to the increase?
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### What is taking so long in this simplification?

I killed this after 48 hours, it did not seem to be getting anywhere. In the best of all possible worlds it would spit out n!. If I put the summation in a function it does compute factorials ...
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### Suppressing reduction in fraction box size in multi-level fractions [duplicate]

Mathematica display complex fractions like this, the second x look smaller, I want it look like this, how can I get it in Mathematica?
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### Agglomerate output to Graph

I'm using the HierarchicalClustering package to cluster some data. So let's say I have this: ...
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### Confidence and prediction bands for custom nonlineal for CDF from ProbabilityDistribution

I have a CDF obtained with the code: ...
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### Using J/Link with Wolfram Programming Cloud

Is it possible to use J/Link in a Wolfram Programming Cloud notebook? I need it to load and use 3rd-party .jars.
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### Finding Symmetries of Points on a Sphere

Currently, I am working on a project where I would like to find symmetries of points plotted on a sphere. One example would be to rotate the sphere 180 degrees about the x-axis and the picture would ...
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### AssociationMap to query Dataset across levels?

Is there a way to operate on Dataset across levels to apply a function f to a key -> value pair in an Association as follows: ...
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### notebooks not opening in mathematica 10

I`m a guest here, and thought I could just ask you guys. ...
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### Constraint in a 2D plot with Legend

I have the following plot: ...
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### Numerically Integrating to find a Maximum using NDSolve

I am trying to numerically find an equilibrium (maximum) of a function using its differential. The following is a simplified version. ...
45 views

### Some question on “Reduce”

Is this my mistake? I am trying to solve ...
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### Set min and max ranges for axes in ParametricPlot

I'm having trouble with this one plot I'm trying to make. I'm using NDSolve on a system of differential equations and when I plot it with ParametricPlot, the scales or lengths of the graphs axes come ...
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### Is it possible to build/simulate/extract data from a System Modeler model completely inside a notebook using the MathModelica language syntax?

See examples in: http://www.mathematica-journal.com/issue/v10i1/contents/MathModelicaPaper/MathModelicaPaper_2.html It seems to be ruled out by the statement (Chapter 2 intro): "The subset of the ...
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### Approximate a function of four variables with a rational polynomial

I have a function that consists of four variables. Currently, I want to view it as function of one variable over the interval (0, 1) with the other three variables as parameters. I will plug values ...
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### Defining a function from a list [on hold]

I have a list of 49 numbers, and I would like to define a function f such that f(n) is simply the nth number in the list. How can I do this?
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### Mathematica 10 : Where is the Mathematica Book? [duplicate]

The question is simple. In Mathematica 9, there used to be "The Mathematica Book" integrated with the software in the help system. I can't find it anymore in version 10. Do you know if it is still ...
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### FindMinimum slower in MMA10

I've recently updated one of my PCs (both have the exact same build) to Mathematica 10. After running the exact same notebook (which has two FindMinimum calls) on ...
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### Why does Mathematica not go to specified order in series?

For some reason Mathematica will not evaluate this asymptotic series to the requested order. Inputting: ...
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### Why can't I pass in a product of matrices in my modified matrixform? [duplicate]

In attempt to build a function that would work like MatrixForm but would wrap a matrix with brackets, I tried the following function: ...
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### Line Breaks in AxesLabel or PlotLabel?

Searching got me peripherally related threads, but not exactly what I was looking for. I'm making some graphs which I want to use on exams. Sometimes, labels (specifically in AxesLabel and PlotLabel) ...
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### Computational complexity of symbolic determinant

I'm using the Det function in Mathematica to compute the determinant of an $n\times n$ matrix $A$ with entries of the form $a+bt$ with $a,b$ integers and $t$ a variable, and I would like to know what ...