# All Questions

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### How to make 3D object smooth?

This thread considers mathematical methods here to make the 3D object smooth but this question consider how to achieve the goal of smoothing a 3D object in Mathematica. I want to get smoother ...
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I know that $Epilog is called when Mathematica is exited; is there a callback upon exiting the notebook? If so, what is it? 2answers 318 views ### Creating an API or Widget based on a Mathematica notebook I'm trying to create a matrix calculator and graph tools for our website and was wondering if there is a way to create Wolfram API or Widgets based on a Mathematica notebook. 1answer 424 views ### How do I set the boundaries of the legend for a ListDensityPlot? I have a 3-d array imported from a text file. One dimension represents time, and the other two represent space. It's basically an array of 2-d arrays of temperature values. I want to plot these values ... 5answers 371 views ### Faster way to convert triangle list to edge list with no duplicates I have a list of triangles returned by a Delaunay triangulator, in the following format: ... 3answers 486 views ### How to revolve a surface about a line other than the$x,y,z$axes? [duplicate] I just started working with Mathematica 8 and I'm having trouble revolving a function the way I want. I have to revolve the function$x^2/4 +2$and$y= 0$around$y=6$to form an ashtray, but I ... 1answer 930 views ### Manipulate (Linux version of Mathematica) I'm runnning Mathematica 9 on Ubuntu 11.10. After installing CDF player I still have problem (most of time) with Manipulate. Only way I'm able to change value of a ... 2answers 249 views ### Update a function avoiding infinite recursion I am quite new to Mathematica and not completely familiar with functional programming. I am currently working with a function (call it foo) and wish to change its behaviour, for example, by adding 1 ... 2answers 592 views ### Evaluating the integral of$\cos (\theta )\cos\left[\tan ^{-1}\left(\frac{a^2 \tan (\phi )}{b^2}\right)\right]$I am trying to evalute the following integral: Integrate[Cos[θ] Cos[ArcTan[a^2/b^2 Tan[φ]]], {φ, 0, 2π}] I know that for$a=b$I should get 0 out of the integral ... 1answer 119 views ### Only perform a symbolic differentiation once I want to define a function that involves a differentiation step that Mathematica can do easily, which might be of the form ... 1answer 80 views ### Numerical integration with OwnValues Say I have a symbol with an OwnValue a = y And we define an integration like this ... 1answer 511 views ### Problem using NDSolve This might be some simple mistake, but I am running out of ideas. I am trying to fit an ODE system to some data. This error keeps appearing NDSolve::nlnum: "The function value {0.299812 - ... 2answers 333 views ### How can I get the right hand side of a delayed expression? Imagine there is a given function f, defined with SetDelayed, say f[x_] := Sin[x]^2 + Cos[x]^2. Is it possible to get rhs of ... 1answer 434 views ### Substituting solution from Solve into the equation and making a plot I want to solve an equation and substitute it into a Plot expression. My code looks something like this a[b_, x_] := bx + 1; sol = Solve[(1 + b)x + 1 == 0, b] I ... 2answers 295 views ### How can I change a Slider's appearance? I am using Mathematica 9.0 and Windows 7. I want to create a Slider that looks like the following: I tried the following: ... 0answers 41 views ### Define a Plot3D function with custom options [duplicate] I am trying to define a Plot3D function with custom options, following (this previous SE question), but I'm running into a brick wall. I've narrowed the problem to the following 'toy' code: ... 1answer 217 views ### Automating sequential import of data from web I am trying to import data from multiple web pages hosted by a single online source. The data is posted by the source as one data set per web page for each week of the year. I would like to import the ... 1answer 177 views ### Alleviating a bottleneck involving a function call with symbolic derivatives I have a bottleneck problem involving a function call with symbolic derivatives. I don't have much experience with Mathematica (or any dynamic language) and I'm certain that the way I've set this up ... 2answers 539 views ### Using Mathematica to find poles of Gamma functions I am concerned about the expression on the RHS of equation A.5 (page 19) in this paper: $$\int\frac{d^d ... 2answers 307 views ### Mathematica averaging a big list of large images I have a list of several hundred images, and I want to average the list to get a single image. Each image is 12bit TIFF with 2048*2048 pixels, and I am using the following to do the job: ... 3answers 4k views ### Solving a time-dependent Schroedinger equation I want to solve the time-dependent Schroedinger equation:$$ i\partial_t \psi(t) = H(t)\psi(t)$$for matrix, time-dependent$H(t)$and vector$\psi$. What is an efficient way of doing this so ... 4answers 1k views ### What tools can help in realizing tail recursion? I had nice discussions with Leonid and Rojo that got me interested in tail recursion. Tail recursion is not always easy to realize with Mathematica, so it would be nice to have some tools to help with ... 1answer 284 views ### Can Wolfram's Player Pro use proprietary packages? A few entwined/related questions: Can Wolfram's Player Pro use proprietary packages? I have searched Wolfram's site pages on Player Pro and don't see anything that provides a clear answer to this ... 0answers 102 views ### Extracting Facebook Managed accounts (pages) in Mathematica? [duplicate] I want to use Mathematica to explore various relationships on my Facebook pages. I've been able to successfully extract information on my personal Facebook page using the build in Social Media ... 1answer 139 views ### Any solution to system of equations? I need ANY combination of 8 variables which satisfy: a+b+c+d+e+f+g+h=0 a^2+b^2+c^2+d^2+e^2+f^2+g^2+h^2=1 a*b+b*c+c*d+d*e+e*f+f*g+g*h+a*h>2/3 Ideally these ... 3answers 532 views ### How to use custom Dynamic inside Manipulate I was wondering if it is possible to use a custom Dynamic[var, function] inside a Manipulate. The reason for the need is this: ... 2answers 365 views ### How to punch a hole in some 3D distribution of points Suppose we have a long list of 3D Cartesian coordinates, defining a distribution of random points in 3D space. How could we remove all the points inside a sphere of radius ... 1answer 161 views ### Position with Except returns first item {0} and last item {}. Why? Here is a simple list: l={1, 0, 2, 1, 0, 1, 0, 1, 2, 0, 2, 0, 1, 0, 1, 0, 0} To get the position of non-zero elements I use ... 6answers 2k views ### X-Y scatter plot with coloring dependent on Z value [duplicate] I have an array of$(x,y,z)$triples (array dimensions: N x 3), from which I can make a 2D scatterplot of$(x,y)$values: ... 6answers 1k views ### Why is this Mandelbrot set's implementation infeasible: takes a massive amount of time to do? The Mandelbrot set is defined by complex numbers such as$z=z^2+c$where$z_0=0$for the initial point and$c\in\mathbb C$. The numbers grow very fast in the iteration. ... 1answer 307 views ### DeleteDuplicates[] does not work as expected on floating point values Here is my simple example, and in this case function DeleteDuplicates does not work as expected. I want to FindRoot of my ... 2answers 157 views ### Unexpected behaviour of SeriesCoefficient? Following this question/answer I discovered and played with SeriesCoefficient. In particular, I tried ... 2answers 257 views ### SaveDefinitions->True changes the displayed image I have a Manipulate[ ] that displays an image with a superimposed Locator object. It works fine when I have ... 2answers 701 views ### Find closed form expression for series expansion coefficients [duplicate] Is there a built-in function that will find a general expression for the coefficient of the series expansion of a function? Series will only give the explicit ... 1answer 245 views ### Digital Elevation Maps (DEM) are Warped yet ReliefPlot renders as a rectangle - how do i join? I downloaded several USGS Digital Elevation Maps (DEM files) corresponding to 12 adjacent areas. Each file Imports[] into Mathematica and I can render the individual ... 0answers 270 views ### Data structure for a list of actions The idea: I need to generate a sequence of events then run a "propagator" over the list of events where the "propagator" will update the state of the following event. I can then write functions that ... 2answers 177 views ### How to use ScientificForm in computation Lets say I want to add 2 values : ... 0answers 376 views ### Cubic polynomial interpolation with velocities listed rather than some points I am trying to use the function BSplineFunction[] to create a natural cubic spline. Normally what is done is that you specify "SplineDegree -> 3" and include a list of points and it will carry out ... 2answers 859 views ### How can I mesh a solid cylinder with triangular or tetrahedral elements I need to plot triangular mesh on a cylinder. However the function Cylinder doesn't have a mesh option. By using ... 1answer 674 views ### Controlling ColorFunctionScaling Is there a way to control the scaling of ColorFunction beside just to turn it off and on with ColorFunctionScaling? Two ... 7answers 944 views ### Graphical representation of a moving sound source Some explanation since I have got a specific and another more open-ended question: I used two microphones in a 90° arrangement (see picture below) to capture sound from a source moving around the room ... 3answers 601 views ### Replace very small numbers by zero in the output of a list I have a long nested list, but many elements are numbers of order 10^-18 or less, eg ... 1answer 72 views ### DateString and localization,$Language ignored

I have a DateString calculated in English. Now I would like to change the output according to localization. I have read that localization is possible for Menu, ...
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### Exporting large numbers to a text file [duplicate]

I need to export large numbers to an ASCII text file, but as simple digits without powers of ten, e.g. I need to write 123456.789 to the file and not 1.23456789E10^5. It seems like such a simple ...
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### Randomly assigning color to Graphics3D objects?

I have a set of Graphics3D primitives (here, spheres) which I would like to assign either: (1) One of a subset of colors, e.g. {Green, Red} (2) A random color over some RGB interval Writing ...
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### Integrating a list of functions

For the purpose of this minimal example, let's say we have a list of functions, like this: f[y_?NumericQ] := {NIntegrate[z*y, {z, 0, 1}], a y} I want to ...
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### Using the LQGRegulator to build a human operator model

I'm trying to build a human operator model using an optimal control model in Mathematica: The vehicle dynamics are given by ...
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### Tick marks shrinking with ImageResolution [duplicate]

High resolution PNG export is handy for print quality plots, however tick marks are not scaling properly. Does anyone know a solution or a work-around, preferably for M7 (on Win7)? ...