# All Questions

252 views

### Showing separate surfaces

The XYZPipeJunction is removed using circular trig functions from Both. ...
251 views

### Simplify binary expressions

Is it possible for Mathematica to do simplifications for expressions where the variables are binary, such as: a + b = 1 + 2*c => a + b = 1 Here c must be 0 because if it is 1, the RHS is 3 but ...
198 views

### Problem with ContourPlot [Not smooth curve] [closed]

Here is my code ...
131 views

### Write 7. as 7.0 and .7 as 0.7 [closed]

i would like to know how to do in order to transform using a function .7 in 0.7 and 7 in 7.0. I need that the values in the list will really change because i must print them in a text file. Thank ...
449 views

### Points of Intersection

How to numerically find points of intersection between pair of curves (Here,a circle and a parabola) ? Finding it a bit messy as, for a point on one curve, slope of the other is involved. ...
779 views

### Gap in a continuous plot

Why do I get a gap in the plot below and how can I fix it? (If you are interested in it, you can see a new related question: How to plot an implicit value funtion, which is also a little chanlenging) ...
234 views

### How to plot this region?

Consider the $2\times 2$ matrices \begin{align} A=\begin{bmatrix} a_{11} & a_{12} \\ a_{21} & a_{22} \end{bmatrix} \end{align} and \begin{align} B=\begin{bmatrix} b_{11} & b_{12} \\ ...
259 views

### Max element of a list with a custom ordering function

I need a function to find max element of a list according to some custom ordering function, assuming that the function implements a total order (elements being compared might not even be numbers). ...
402 views

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539 views

### NDSolve with Explicit, Implicit Euler and Trapezoidal method

I am using Mathematica 9.0 both on Linux and Windows and I would like to integrate the Van der Pol equation numerically using various techniques such as Explicit and Implicit Euler and Trapezoidal ...
2k views

### How to take transpose of a one dimensional vector? [closed]

Why the two followings giving me same output? At least one should give me a row vector and another should give me a column vector. ...
300 views

### Expanding huge expressions that simplify and factor

The following is for Mathematica 8.0.4 running on Windows 7 laptop (6GB memory). I have eight expressions that are unexpanded multivariate polynomials in 6 variables. They are huge expressions, so ...
204 views

### Wavelet transform of data with sliders

I saw a beautiful application of wavelets applied to a randomly created data series of about 500 data points. It used the Haar wavelet and had two sliders. The first slider allowed the user to view a ...
134 views

### How to center LegendLabel in BarLegend

BarLegend leaves a white region at the other end of the legend (the "0 end"), which is best seen by plotting a frame around the legend: ...
87 views

### Geodesy without units?

Suppose I'm interested in the latitude of Los Angeles and I do the following: ...
240 views

### Structure analysis based on direct stiffness method. Solve taking too much time

The program generates a very large matrix based on some input from the user. The matrix is symmetric and called generalstifnessmatrix. It also generates 2 other lists(displacement and forces list) ...
226 views

### Extract Specific Dates from DateList

Hopefully this is an easy question but I couldn't find an easy answer anyway. Surely there is some simple way to splice this... I want to take a large datelist in the format of {{2014,12,31}, value} ...
240 views

### 10.0.2 breaks a recursive “trie” query

The 10.0.2 Dataset type system complication breaks a recursive trie constructor that worked in 0.1: ...
519 views

### List Contour Plot: Delete some contour lines, but keep the colors

I'm trying to make a Contour plot of a set of data of the kind: $(x,y,f(x,y))$ What i'd like to do is to remove the majority of the iso-line and just leave two of them, but keeping the changing of ...
147 views

### Symbolic quadratic constrained maximization with non-negativity constraints?

Dear Mathematica users, I attempted to maximize the below quadratic function K, subject to x1+x2<=A, and a series of ...
630 views

350 views

### Plotting boundary of piecewise function in ContourPlot

I am trying to do a ContourPlot of the following function: ...
136 views

### What kind of PDF files that MMA does not read (import)

SORRY that I have tried 5 different files, which were too complicated for MMA to import. So I thought that maybe it just does not read any files. But I was wrong. So edited my question. In here, is a ...
167 views

### Is Mathematica's (v10.0.2) NetCDF exporter broken?

I'm trying something very simple, namely: Export["file.nc", {"Datasets" -> {"seqs" -> {"AAA", "BBB"}}}, "Rules"] And getting Java errors about "illegal ...
143 views

### Pattern Match and Replace Expression involving Pure Function

Let's say I have an expression that in held form contains a pointer to a function. expr = Hold[2*{"FUNCTION1"} + 5]; ...
129 views

### How to adjust the animation rate in a Manipulate environment

The enclosed code is a simplified version of the "Make Your Own Solar System" demonstration. How do I remove the manual Faster and Slower animation controls and add code for a permanent very slow ...
239 views

### Trying to Figure Out how to work with datasets & Classify[] and Predict[]

I'm new to Mathematica and I'm a bit overwhelmed. I have always used R for my statistics problems. Now that I'm trying to replicate what I do in R in Mathematica I'm making little progress. For ...
Is it possible to get all points on a Polyhedron surface using two surface parameters, say $\phi,\theta$ spherical co-ordinates? Just like in ParametricPlot3D, can we start with PolyhedronData ...