# All Questions

186 views

### How to graph a series of coupled oscillators and watch the wave move along them

Here are the differential equations that set's up the 11 coupled oscillators. ...
519 views

### Why are my plots displaying behind the axes?

I need to create graphs with light gray axes and black lines. All of my plots display behind the axes. How can I make the plots display over the axes? ...
67 views

### Differing behaviour of GeneratingFunction with different numbers of parameters

When given a single variable sequence, GeneratingFunction is automatically expressed in the most "direct form", for example, ...
43 views

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302 views

### Image of input and output cells is not exported correctly

Wolfram Blog uses PNG images to display input and output cells in a notebook. For example, the following is an image from Samuel Chen's post: I should be able to produce a similar image by ...
66 views

### Reduced Planck constant and UnitConvert to Erg * Second

I declared the reduced Planck constant by ℏ = Quantity[1, "hbar"] which worked. Now I want to calculate something in cgs units. Therefore, I tried to convert ...
176 views

### Create polygon using edge lengths and area

Four-sided convex land plots are usually denoted with edge lengths and area. How do I create a Polygon Object with these parameters in Mathematica ?
90 views

### Reducing exponential inequalities fails

I am quite stumped by this problem : Reduce[ N^(x-y) <1 && N > 0 , x, Reals] gives the expected result ...
62 views

### How to efficiently count occurrence of some element in a list? [closed]

I have a list of numbers, for example: list = {1,2,3,4,2,1,3}; what would be efficient way to count all occurrences of some number? I tried so far: ...
79 views

### Shapley value and Mathematica [closed]

I use the TuGames package in Mathematica to analyze cooperative games. Is it possible to calculate Shapley value, Nucleolus, etc., for a large number of players like 400 or more?
53 views

### Forming product of function of prime factors

Given a list of numbers each containing 2 prime factors, I wish to make a list of the products of the logs of each factor. For example, given L = {4,6,9}, I would like to form P = ...
82 views

### When is the output of examples in function documentation rasterized?

Upon building documentation in Workbench, Workbench sometimes converts the output of examples on function pages into rasterized images, and sometimes not. Does anybody know what controls this ...
87 views

### Problem with Sinc[x] function and rounding

I seem to be having some trouble with the Sinc[x] function, and I think it's due to rounding, but I'm not sure. The code is below, with relevant constants: ...
35 views

### 3D plot changes it's size while rotating [duplicate]

When I am rotating drawn 3D plot by mouse it rotates Ok until mouse release. After that it slightly changes it's size instantly. Probably it tries to accommodate document layout or something. Is it ...
65 views

### NIntegrate converging too slowly when increasing size of array

I have a problem with a numerical integration. I have a 4x4x4x4 array that has for each entry an integral and I want to use NIntegrate to evaluate it. It gives me ...
61 views

### Rounding only reals in an expression containing, reals, integers and symbols

I am trying to make a function that would make rounding real numbers in an expression possibly consisting of real numbers, integer numbers and symbols. An example of such an expression is below: ...
59 views

### White spots in ListDensityPlot

I have a problem with ListDensityPlot. I have some data on an irregular grid. I try to plot them with ...
1k views

### How to do System dynamics simulations / diagrams in Mathematica?

System dynamics is an approach to understanding the behaviour of complex systems over time. It deals with internal feedback loops and time delays that affect the behaviour of the entire system. What ...
161 views

### Computing Correlations and p-values

I have two vectors $A$ and $B$ of length (say) $50$ or so, and I want to determine whether there is any correlation between their entries. I computed their correlation directly and found it to be ...
358 views

### Speeding up export of a matrix to a dat file

I'm trying to export a 1000*100 matrix of numbers to a .dat file using Export (I want the numbers to be separated by a tab) and ...
115 views

### Finessing labels in BarChart

BarChart is aggravating. Why don't the following correctly display both percentages and labels? (1) ...
122 views

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65 views

### Finding and interpreting errors [duplicate]

This sounds like a fairly trivial question, but I can't think of any way to solve it. I am doing an extensive parameter sampling where a set of ODEs is used together with ...
46 views

### Interpretation of output derivative expression [duplicate]

I am trying to write Mathematica file to find Div, Grad, Laplacian, etc. in coordinates ...
132 views

### Getting RGBA data of an image with ImageData

What is going on with returned data in the following examples? It appears ImageData returns different types depending on the what data is passed into ...
87 views

### What's the main difference between FindClusters and ClusteringComponents? [closed]

In many cases, FindClusters and ClusteringComponents provide similar results. Options for hierarchical and agglomerative ...