# All Questions

457 views

### Wavelet Transform Modulus Maxima (WTMM) method

Has anyone already coded the Wavelet Transform Modulus Maxima (WTMM) method for computing the singular spectrum using multi fractal formalism in Mathematica? The goal is to analyse 1D, 2D and 3D ...
34 views

### FindIndependentEdgeSet behaves differently in v9 and v10

The following code gets different output in v9 and v10. ...
530 views

### Unknown option LegendPosition (even after Needs[“PlotLegends”]) (Mathematica 10.0)

I'm running Mathematica 10.0 for Students. When I tried ...
185 views

### ListPlot3D not working for very small numbers

I have defined a function FreeEnergy[x,y], which I want to plot in 3D. It is a function involving numerical integrals. When I make a flattened table ...
299 views

### Drawing an dodecahedron with vertexes at given coordinates

I want to draw an (edit)dodecahedron with the vertex in the following coordinates: ...
212 views

### Mathematica and POV-Ray workflow: ListContourPlot3D

I have the following function describing a molecular electronic Orbital. ...
164 views

### NDSolveReinitialize start from previous solution but with different boundary conditions

I am solving a set of coupled partial differential equations (some variation of a 1 dimensional compressible fluid flow). I want to solve the equations (NDSolve, this works fine) but then continue ...
35 views

### How to fix the PlotRange on LogPlot? [duplicate]

I'm plotting families of Boltzmann'esque distribution functions $\propto\exp\left(-{\dfrac{\varepsilon+{\mathcal O}(\varepsilon^2)}{k_\mathrm{B} T}}\right)$. But it won't let me fix the ...
319 views

### What does IndexBy do and how exactly does it work?

I just saw the function IndexBy in the autocomplete suggestions and I was curious to know exactly how it works. Unfortunately, there's no trace of it in the ...
107 views

### Operator product

I have this problem: I define the gradient operator as: gradiente = {D[#, x] &, D[#, y] &, D[#, z] &} Now, if I want to apply the operator on a ...
137 views

### What is stored in FrontEnd memory?

I quit the kernel, and closed all notebooks, leaving only the startup window. Yet when I open a new notebook, MemoryInUse[\$FrontEnd] reveals that the FrontEnd still ...
90 views

### How to get the number of entries of histograms in the legend?

I plot three histograms (originating from a large Dataset ds) in one graph ...
79 views

### import file from directory using sftp

I want to import a file from a directory on a ftp using sftp. I'm not sure how the command looks, but here is what I have tried (based on this older post): ...
195 views

### Overdetermined System of PDEs

EDIT: Just to clarify a large part of my question is whether there is a way to make Mathematica solve a system with more equations than independent variables (so a system that is overdetermined but ...
124 views

### Help with plotting and improving code

I'm trying to solve a coupled DDE. Here is my code ...
212 views

### How to make a symbolic vector into a pure function?

As part of a set of functions to implement a steepest descent algorithm I created my own n dimensional gradient function. It is defined as follows: ...
819 views

### Fitting a Damped Sine to Data

I have some collected data that should be modeled by a damped oscillation. Here are the data in a list of ordered pairs: ...
43 views

### Using MatrixForm in a Manipulate

I have declared some lists vAwG = {{{0}, {0}}, {{1}, {1}}}; psi = {0, 1, 2, 3}; vBwB = {{{1}, {0}}, {{0}, {1}}}; and created a function ...
71 views

### Variables input generation for Minimization in High dimensional space [duplicate]

I'm currently doing optimization in a high dimensional space. I was thinking of giving FindMinimum (or NMinimize not certain ...
268 views

### Calculating displacement for a circular disc

I have to calculate the difference in diameter of two concentric circles. The image is obtained from an experiment and the data looks like this. The length required is the value of l as marked in ...
104 views

### PNG image is exported smaller size than imported

I upload a PNG file and then split it into its red, green and blue components. I then save these components. The original image is 1440 x 764 pixels, 2.21MB. But the 3 saved files are each 360x198 ...
101 views

### How to export many images within a For-loop [duplicate]

I'm trying to export a lot of files at one time with a For-loop. I'm using ToString so I can number the output files. It's not working. Does anyone know how to ...
156 views

### Updating Manipulate output from within a Button

Consider this (edit: Pause[3] represents some long computation the button should do): ...
116 views

### Creating/placing Mathematica cells anywhere

I am interested in making powerpoint-like slides using Mathematica. The most appealing thing about writing documents in Mathematica is that it is so easy and quick to type complicated formulas with ...
349 views

### Align stars in multiple images

I hope that you find this question interesting and that this will help others with similar problems as this configuration is not so particular. My problem I have multiple images of a particular ...
138 views

### Problem with NIntegrate over a user-defined region

I define a region as follows: ...
135 views

### Perceptron: Do loop not returning a value

I am trying to write a function that finds a simple best fit line for some data (Perceptron algorithm). Sadly it returns no output at all. Here's the code below: ...
91 views

### Finding roots of a function with a varying parameter

So I'm brand new to Mathematica, and basically what I want to do is find the roots of a function at varying time intervals. The function I'm using is: ...
438 views

### How to randomly select subsets

I have a list of around 300 elements. I want to sample subsets of length 25 such that my samples are all distinct. My first inclination was to use something like ...
372 views

### Obtaining an NIntegrate error estimate

Is there a way to extract the error that Mathematica estimates when calculating a numerical integral using NIntegrate? Internally Mathematica must keep track of ...
82 views

### problems with wstp32 (WSTP / mathlink)

I've been recompiling old mathlink programs in Visual Studio 2013. No major problems so far until I got to a program that is seemingly similar to the others but that fails dramatically in the linking ...
102 views

### Unit System documentation

Is there any documentation on what consists of the unit system "SIBase","Imperial", "SI" and ...
131 views

### Saving memoization to disk

I like using memoization (i.e. the construct myFunction[x_]:=myFunction[x]=...) when I have a heavy function that I need to re-evaluate on the same arguments. ...
239 views

### Using Block with a list of variables

I have a list of variables var={v1,v2}; which I want to protect/localize during a particular operation. I have decided that I want to use ...
101 views

### Implementation of Lubaehevsky-Stillinger Algorithm to pack hard spheres

To generate a model of a polycrystalline material with specified grain size distribution (e.g coming from a Monte Carlo Grain Growth simulation) the Paper "Effects of grain size distribution and ...
164 views

### Is there a function that filter positive values x = f(x), and return zero for all negative values? [closed]

I'm searching for f that will comply this definition : x = f(x) where x is natural >= 0 0 = f(x) where x is natural < 0
224 views

### Adding map to 3D plot?

I've made a 3D plot of a pressure surface over the region 160W-20W, 20N-80N - the right panel and I would like to put a map under it, probably just continental outlines for simplicity. I'm just ...
130 views

### Problems with the plot of a function. [duplicate]

For some reason the result of Plot of the following function: ...
77 views

### Interacting Dynamic Components within LocatorPane

I am attempting to create a dynamic contour plot of an ellipse with two locators as the foci within a locator pane. The following code has been implemented: ...
83 views

### Variable change

If I have the following Hamiltonian: ...
107 views

### NIntegrate vs. summation

I' m interesting in distributions of points on sphere, plane figures etc. Especially for small number of points: 1, 3, 7, ... It seems that good criterion for uniformity of distribution is some ...
76 views

### Model without graphics

I have the next code: ...
88 views

### Export a Pyramid to VRML format

How do you export a Pyramid to vrml format in Mathematica ? I have been trying to do this the following way ...
96 views

### Slow application of Outer on a matrix

I have some performance issue with the calculation of a gaussian kernel applied to a not-that-large dataset. I'm not very good with performance tuning in Mma and I have the feeling this one could be ...
112 views

### Plot with two LabelStyle

I need to plot a graph using two different colors for the axis labels. Not working example: ...
215 views

### There is an issue with Manipulate in which it updates its argument twice in V10

I have asked this question before (here) and I thought that the issue is only when moving the Notebook window. It appears that Manipulate is working in weird manner. ...
177 views

### Export Multiple Arrays Into a Single Worksheet with Column Headers

I'm importing financial data into Mathematica, creating column headers for each array and exporting to Excel. The code below accomplishes most of this, but it creates a different worksheet for each ...
161 views

### Mysterious spikes in Plot3D

I am using Mathematica 9 and get these strange spikes when I plot the following simple function. I have seen a previous post about this but cannot figure out what is wrong with the following code. ...