# All Questions

244 views

### Plotting the results of NSolve as Horizontal Lines

Suppose I use NSolve to find the Real approximations to the intersections of two separate functions over some specified range: ...
903 views

### Visualizing Line Integrals

I have a plane curve $C$ described by parametric equations $x(t)$ and $y(t)$ and a function $f: \mathbb{R}^2 \rightarrow \mathbb{R}$. The line integral of $f$ along $C$ is the area of the "fence" ...
220 views

### List Density Plot

What are the axis label for a list density plot? I have it set up to create the plot for 2 columns from a data set I got from an experiment, I'm just unsure of what each axis is supposed to be.
154 views

### How to prevent Round with hided fractions

I found a strange behavior in Round. If we try: ToString[Round[4.811, 0.01], InputForm] we get: 4.8100000000000005 When I expected 4.81 In order to ...
288 views

### Help deciphering Neumann Value

Version 10 has an option for NDSolve called "NeumannValue" which is supposed to allow you to specify boundary conditions of the form $\vec{n} . (c \nabla u + \alpha u -\gamma) = g-q u$ but there is no ...
194 views

### Image Size using {w,h}

Mathematica help file says: "With ImageSize->{w,h} an object will always be drawn in a $w\times h$ region, and will be sized to fit in the region. " However: Doesn't look like "and will be sized ...
97 views

### Why mathematica is not default set to give real solution, instead of complex one? [duplicate]

N[(-8)^(1/3)] gives 1. + 1.73205 i. Since $(-8)^{\frac{1}{3}}$ has three possible solutions, one real and other two are complex. So, why do not mathematica provides all the three solutions, and if ...
88 views

### RegionUnion issues with many Regions

The new RegionUnion[] function is just what I needed if only I could get it to work. I have many non-overlapping regions that I will need to use as plotting domains ...
29 views

### Variable as Difference of 2 Variables

I would like to evaluate a function based on the absolute difference of two variables. An example: g=5*x-5*x*y-5*y diff=x-y D[g,x] D[g,y] D[g,diff] I cannot find ...
132 views

### Export to .eps ruins the formatting of subfigures

As a result of this question an issue of Export emerged. I.e., when I set my .eps figures with ...
56 views

### Is it possible to pipe the output of EvaluationMonitor to Excel?

I have an EvaluationMonitor setup to capture the points processed by NIntegrate. This is a case where the same function, integrated over the same region in cartesian coordinates yields a dramatically ...
149 views

### How to help MMA to simplify integrands?

MMA sometimes has to grind for LONG time on easy integrals: ...
184 views

### Capturing microphone data [duplicate]

How to capture current microphone data, just like using the function CurrentImage[] for capturing image? For example, this captures an image: ...
298 views

### Help solving the following non-linear differential equation

After spending several hours exploring different options, I still couldn't not figure out how to solve the following differential equations. Any suggestions would be highly appreciated. ...
93 views

### Different results for NIntegrate for the same function using cartesian and polar coordinates

This is probably a straightforward question. I have two functions f[x_,y_,z_] and g[r_, theta_, z_] where: g[r_, theta_, z_] returns f[ r Cos[theta], r Sin[theta], z]. For the same points in ...
175 views

### Plot Legends when first argument was generated by Table[]

I can get a plot to generate legends for different functions when these functions are put into a hand-coded list. However, when I generate the list of functions using Table[] only one legend is ...
185 views

### Get the position of the right interval

I have a list of intervals: Intervals = {{0, 1}, {1, 2}, {2, 3}, {3, 4}, {4, 5}, {5, 6}} and a list of measurements: ...
148 views

### Opacity renders lines incorrect in certain viewing angles

Trying to learn how Opacity works, I found a possible issue. Generating points in a square spiral with: ...
67 views

### DayRound Rounding Values:No difference between “Preceding” and “Following”?

On Mathematica 10.0.1 both DayRound[{1980, 2, 29}, "EndOfMonth", "Preceding"] and ...
281 views

### Defining an alternative derivative function?

I want to calculate the derivative at a point, but I do not want to use the built-in derivative function D. I began with this definition of the derivative , ...
183 views

### In there a way to derive the inverse value of CDF format MultinormalDistribution?

Is there a way to produce the inverse value of multinormal distribution function in CDF format with 0.05 significance level? I found the function called ...
174 views

### Problem with a Markov's Matrix

I recently discovered the Markov process. To simplify my work, I use the following code taken from the DiscreteMarkovProcess documentation: ...
869 views

### Exclude data from a list

Let's create some random sample data data = Table[{RandomReal[{-10, 10}], RandomReal[{-10, 10}]}, {i, 1, 300}]; Then we plot them using ...
245 views

### Manipulate Slider Value on the Plot

Lets say I have a very simple manipulate in Mathematica given by: Manipulate[Plot[Sin[a x],{x,-2 Pi,2 Pi}],{a,0,5}] I want two things which I am unable to do: I ...
126 views

### Is there a way to accelerate buffering to the screen

I have an application that does a bunch of small computations, mostly Table management, and logic around loops. It takes seconds to execute. However, when I turn on debug (a variable I set for ...
50 views

### Suggest how to do this matrix multiplication [duplicate]

Have a look at the Mathematica calculation ...
80 views

### Button action preventing parallel execution?

I couldn't find a better title, so I'll jump straight to the example! There is this long list of slow jobs to be executed in a parallel way, at the press of a button: ...
137 views

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557 views

### Draw a region bound by a sphere and a cylinder

Here is my code for drawing the region bounded by the sphere $x^2+y^2+z^2=1$ and the cylinder $x^2+y^2=x$. ...
240 views

### Expand and collapse rows in a grid

Would someone have an idea on how to implement a table with rows that you can expand or collapse in a grid. An example could be found in a pivottable in Excel, for example here http://www.contextures....
134 views

### How to plot $\frac{x^{-2/3} e^ { \left(-\frac{x^{2/3}}{2}\right)}}{\sqrt{2 \pi 9}}$ for negative real numbers?

While trying to $\text{Plot}\left[\frac{x^{-2/3} e^ { \left(-\frac{x^{2/3}}{2}\right)}}{\sqrt{2 \pi 9}},\{x,-5,5\}\right]$ in mathematica, I was initially wondered (though mathematica's silence was ...
57 views

### Manipulate Plot with Controller being difference of two variables

I'm not sure if this is possible at all or whether manipulate is the best option to plot this, but currently I'm using the following code to plot Function Func vs. t values for different x values. <...
211 views

### Hermite method in Mathematica

When I solve the example below, in the results it is mentioned that Mathematica 10 has used the Hermite method. I cannot find anything about this in the Mathematica documentation. Is there nothing ...
201 views

### Returning computable numbers from WolframAlpha

WolframAlpha["Apple company revenue", {{"Result", 1}, "Plaintext"}] Desired output 182800000000 ...
470 views

### How to create a Poincaré disk type kaleidoscope in Mathematica?

Creating a kaleidoscope in Mathematica is not a new topic at all, examples can be found from the links like Wolfram reference and Wolfram demonstrations. My question is how to create Poincaré disk ...
239 views

### Spanning/centering elements with Grid/GraphicsGrid when there's a non-equal number of elem. in rows

I'm trying to align elements in Grid/GraphicsGrid: Grid[{{a,b,c},{d,e}}] This makes ...
120 views

### Problem solving a differential equation

I want to solve the following differential equation: y''[x]+a*y[x]=-b*u[x], y[0]==0, y'[0]==0 for y(x). u[x] is a vector, ...
155 views

### Insert a linebreak and character repeatedly into a matrix output which is in fortranForm

Suppose I have a very long string which is a11 element of matrix a11=2*gopsv-2*Bgopsvw+2*acgmops*v+2*cgmopsv*B-2*acgmopsvB+3*gmopsvB-3*BgmopsvwB+m*w2*B +5*acgm2 +opsvB -ac*m2*w2*B +cgm2*opsvB* - 3*...
275 views

### Plotting in Elliptical coordinate system

I want to plot an equation in elliptical coordinates. In the traditional elliptical system, Ellipse and hyperbola shares the same confocal point. Is there a plot function that draws a function in this ...
264 views

### Using 0 to create new columns in a list with Part

I just discovered a nice way to create intermediary columns in a list, and I would like to know if I can have some problem with it. It Works like this: Imagine I have this list, 5x3: ...
46 views

### How to show Output of matrix in FortranForm with “&” character?

I have a matrix. and i have shown the output of matrix one by one element in FortranForm. the problem is i want to put "&" continuation charater in output because when i am copying the data into ...
202 views

### Copy/Paste of quoted text crashing Mathematica 10?

(Mathematica 10.01 under Windows 7) Create two text cells and in each of them place the following text: <table align="left" style="margin-left:50px; border-collapse: collapse; padding: 0px; ...
53 views

### ListPlot with conditions Part II

In a previous post Part I @Julian S proposed an interesting method in order to segment the data. A copy of the data file can be found here: data. I know that I should provide a minimal working example ...
382 views

### ParametricPlot3D line not smooth

Multivariate parameters appear to present a jagged appearance of integrands (using default Runge-Kutta ODE integration intervals?) in ParametricPlot3D plotting on a single argument. Higher Mesh.. ...
254 views

### How to add “special” Ticks?

this is my code: ...
329 views

### Optimizing Chi-square distance between two distribution

I want to program the chi-square between two distribution Xu and Vu with length N. This function is defined as below: Xu and Vu are real and positive. ...
87 views

### TrigExpand Idiosyncracies

TrigExpand[Sin[x]^2 Log[y]] returns sin^2(x) log(y), as one would expect. However, ...
272 views

### How to get mathematica to show limit of a recurrence sequence?

I want to find the limit of a such a sequence: $f(n+1)=\sqrt{2f(n)-1}, \, f(0)=a, a>1$ How does one do this? Is it possible to have it show the solution algebraically, like it does with ...