# All Questions

251 views

### Extracting ragged array from an image

I have a list of points, which represent positions of peaks in an image. The nature of the image itself shouldn't matter, as I already have the peak positions. As a simple example, consider the ...
68 views

### Help with Multivariate ProbabilityDistribution

I wish to obtain numbers from ...
196 views

### Incorporating the minimum and maximum of the function in a Dynamic plot

I'm working on my project for class and it's supposed to be a graph that can take functions from the user and display it along with finding the max and min of the graph. But I just don't know how to ...
173 views

### Change default output font globally

I'd like to change my default output font to "Helvetica Neue" in version 10. The following shows the only thing I have found in Option Inspector, which would ...
175 views

### Bug in parallel computing

The following is a simplified example. We construct a library function f and another library function g, in which the library function f is called. ...
85 views

### How to ensure efficient order of operations for rules, slots, substitutions?

I need to calculate several functionals Q[[t]] of a pdf f[x]. ...
136 views

### How to use slots and patterns to reduce repetitive calculation?

This is kind of complicated... How can we make MMa calculate values of a function before doing multiple pattern or slot substitutions? Answers to similar questions didn't cover the case where the ...
43 views

### Plotting the real positive solution to a parametric equation [duplicate]

I have the following parametric equation $$x^2-a=0$$ where $a$ is a given parameter. I would like to plot the nonnegative real root ($\sqrt{a}$) using NSolve as $a$ varies from $0$ to $1$. Can ...
350 views

### Computing with matrix differential operators

I am looking the achieve a working set of Mathematica functions that would allow me to take products, commutators, etc. of (2x2) matrix differential operators and apply them to vector-valued functions ...
220 views

### Can't type in notebook in version 10

After upgrading to version 10, I sometime get into the situation that I can enter nothing to the notebook. The Mathematica seems alive but it doesn't take any input from the keyboard. I tried to quit ...
130 views

### Why is there a seeming discrepancy with the expression Cofactor?

I was trying to find out the cofactors of a square matrix. Then I came across the command Cofactor in Combinatorica package. ...
336 views

### How can I create a minimal surface with trefoil knot as inner edge and circle as outer edge?

This minimal surface is the subject of Michael Foster's beautiful wood-turned sculpture "Inversion" (see http://breezyhillturning.com/styled-2/photos-2/index.html). In addition, how can one create 2D ...
161 views

### How to find the intersection of a Line with the boundary of a Region?

Given a 2-D Region $\Omega$, i.e. RegionQ[\[Omega]] && RegionDimension[\[Omega]] == 2 is ...
94 views

### ListPicker delayed output

I'm trying to make a wrapper for ListPicker that delays updating the list unless Ctrl or Shift is released. The aim is to allow nested ...
71 views

### Incomplete Integration in Area

Area[2 Sqrt[(1 - p^2)^2 - r^2], {p, 0, 1}, {r, 0, 1 - p^2}] is able to perform only the integral over r, leaving the integral ...
281 views

### Customizing the order of appearance of legends in PlotLegends

I have a graph with four curves and I want to custom order their appearance in the legend. In particular, in the graph below, ...
243 views

### GPA calculation from a set of randomly generated marks obtained

So, this is a homework question posed by my teacher: "A student has 10 courses. Find the ceiling value of the obtained marks and corresponding grade according to the following data Print the result ...
158 views

### NIntegrate with units: unable to determine the units of quanitites that appear in the input

I want to integrate Planck's law of radiation in a certain wavelength intervall with units. I define some constants: ...
494 views

### Simple image processing very slow

I have compared the speed of some simple image processing routines between Mathematica an IDL. 1. Reading of a grey scale png image of (720,577) pixels: The image is: Mathematica: ...
184 views

### How to assign equation solutions to variables [duplicate]

I have 12x12 Matrix with which I have to solve the equation below: ...
114 views

### Plot table versus table [duplicate]

I have two tables like: nex1 = Table[l3*10^3/4*10^14, {l3, 1, 30, 1}]; nex2= Table[l4, {l4, 1, 30, 1}]; How can I plot nex1 versus nex2 so that nex1 is x axis ...
98 views

### how to get continuation of square matrices with periodic diagonal band automatically?

I want write a function that can automatically analyze any square matrices with periodic band diagonals and give continuations of them. But I can't figure out an elegant way to do this. Suppose we ...
204 views

### How to find the direction of the outward normal in a point of the boundary of a 2D region?

Suppose we have a domain $\Omega$ such that RegionQ[\[Omega]] is True and ...
461 views

### CUDA paclet and Mathematica 10.0.2 code problem

In Windows 8.1 64bit and Mathematica 10.0.2, I used the latest cuda paclet 10.0.1. However,following the sample code in CUDALink User Guide, the CUDAFunctionLoad returns an error. I can not figure ...
86 views

### RunProcess with mdfind and -onlyin option

I have problems running the bash code mdfind -onlyin /some/folder my_string This works on the terminal, but if I try ...
96 views

### Regression with 3 variables

I'm trying to find a function starting from its values but I can't find anything related to functions with 2 variables and I don't know how to go on. So, given this sample data, I'd like to know how ...
233 views

### Better replacement rules to perform this change of variables?

In cosmology, it is common to work with both a normal time variable t and a “conformal” time variable τ, which is defined such ...
217 views

### Bug in ListVectorPlot?

Trying to evaluate the following expression kills my kernel (Mathematica 8.0.0.0): ...
204 views

I'm following the CUDALink tutorial [ http://reference.wolfram.com/language/CUDALink/tutorial/Introduction.html ] and everything is going fine until I get to the part that calls CUDADot on the ...
680 views

### ListContourPlot interpolation fails if x and y axes have different scales

To summarize what is below: ListContourPlot doesn't work when the domain has different x and y scales (fails when x/y~10^4, which seems surprisingly small). Is it possible to call ListContourPlot ...
74 views

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73 views

### Searching in parameter space for a given number of solutions

I have this problem : I have some function g[a,b;x], where a,b are parameters and x is a variable. I know (graphically) that an equation g[a,b;x]=0 has zero, one or two solutions. I want to keep 'a' ...
91 views

### How to be sure I've cleaned up all prior definitions and assignments [duplicate]

Is there any general way besides restarting the kernel to make sure that nothing I've done earlier in a session will affect code I want to run now? One book suggested running ...
675 views

### Rasterize: Resolution option not working properly

Something about Rasterize which doesn't seem to work as intended. Recipe: Make some simple vector graphics: ...
127 views

### Is it possible to move .mx file from one server to other?

I have mathematica file in one server along with .mx file. Is there any way to move the .mx file from one server to other such ...
276 views

### Fast export of large numerical data

Edit It seems that the bottelneck is not due to eigen value problem. I will esit the question soon. I have a 6000by6000 matrix which I got after some calculations. I want to get the eigenvalues and ...
184 views

### Parallel Kernel Status

For parallel computing, the window Parallel Kernel Status shows some information on the subkernels. I can use two kernels, and which each of them I can do parallel computations. However, it seems that ...
106 views

### Overlapping EdgeLabels

I have to make a directed graph for a maximum flow algorithm assignment. Although I have managed to make the graph for the better part, it still needs some work. The problem is that Mathematica ...
190 views

### Create an image showing max intensities in a set of images?

I would like to use a set of two images with the same color scheme (img1 and img2) to produce a new image (...
165 views

### Filtering Query Nested Data (Dataset and Association)

I am trying to filter a nested Dataset. I have some data that looks like this (curated for this example): ...
66 views

### eigenvalues distribution

How does one plot eigenvalues distribution of a large matrix? I want to plot the distribution to show that the set of eigenvalues of the matrix of current interest is symmetric with respect to the ...
325 views

### Monte Carlo Volume Calculation and Speed Up

I am trying to do a Monte Carlo area calculation for an irregular area defined by: $$0 \le x \le 1, 10 \le y \le 13, y \ge 12 \cos(x), y \ge 10 + x^3$$ I used the code with modifications (so I can ...
91 views

### FRED api reports all data in given month with same date

When I use the FRED package to retrieve weekly data, all of the data points for a given month have the date as the last day of the month instead of the date for the week of the data. ...
150 views

### Slow rendering in GraphPlot3D

Is there a way to speed up this rendering? I have to make this call many times in order to make an animation of some dynamics on the graph g. Thus dynamics are carried in the list var. Each entry in ...
72 views

### How to fit this data to be used in NIntegrate later?

I have a list of data points that resemble a chi-squared distribution (long tailed gaussian) that I am having trouble fitting or finding an equation with. The goal is to use the fitted equation in an ...
467 views

### Is there any Robotic Package in Mathematica?

Is there any Package in Mathematica that deals with Robotics and their application?
45 views

I have this: ...
119 views

### Mathematica can't solve simple force-generated-by-cuboidal-planet integral?

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I need your help to make my code faster. I have a formula for computing a value from any monomial $x^i y^j$, say formular1[i_,j_]:=(Gamma[i]/Gamm[j] ). It is just ...