# All Questions

360 views

### Indexed Map Thread

I'm attempting to MapThread a function of two lists that requires the index of the list values. For example, MapThread[#1*i+#2*j&,{{a,b,c},{e,f,g}}] Where #1 ...
52 views

### Wrong autogenerated package from notebook containing #key and Part as subscript

Bug introduced in 10.0.0 and persisting through 10.1.0 or later Mathematica v10.1.0, under Windows 8.1 x64 Mathematica v10.0.2, under Windows 1) Define a function in an initialization cell: <...
80 views

### Is there a function or option to collect factors under one radical sign?

One of the things that frustrates me most about Mathematica's symbolic manipulations is the fact that output is often presented quite differently than most humans would write it. This is especially ...
81 views

### Simplify on a structured array

Why doesn't Simplify and FullSimplify operate on object generated using SymmetrizedArray? ...
180 views

### Enigmatic message about MaxBend

Referring to the method I proposed for Problem with ParametricPlot Mathematica 10.0.2 throws an enigmatic error message: ...
306 views

### NDSolve to solve a PDF

I would like to solve numerically the following PDE: $$\frac{\partial}{\partial t} p(x,t)=-\frac{\partial}{\partial x}p(x,t)+\frac{1}{2}\frac{\partial^2}{\partial x^2}[x^2\,p(x,t)],\;x\ge0,\;t\ge0,$$...
61 views

### Integro differential eq boundary difficulties

I'm trying numericaly solve simple integro-differential equation, but have some problems with boundary conditions. System: ...
45 views

### Calculating number of discernible colors in CIE La*b* space

How can Lab space be easily splitted into unity cubes and determined number of cubes that colours of certain image occupy?
80 views

### Is there a function for “flattening out” and setting to 0 an expression?

For example if I have some complicated expression (all variables are positive integers) but I want to multiply everything out so there are no denominators and then rearrange so that it is equal to 0, ...
160 views

### Express block matrix in terms of matrix basis

I'm trying to construct a function that returns the multiplication table of a matrix Lie algebra. Assuming a basis of matrices, my definitions: ...
149 views

### How to do a Check for every element in the list?

I know how to do a Check for the list in general: ...
178 views

### How can I stop Mathematica from omitting Axes on a Plot?

I'm trying to plot something using Plot[], and Mathematica keeps leaving off one of the axes. I can set Axes->{True,True}, ...
55 views

### Different behaviour of Map and Inner in replace rules

Why does x[{1, 2}] /. {x[l_] -> Map[func, l]} {1, 2} not behave as expected, while for example ...
166 views

### How to split list to strings?

Considering a list: lst = {"1", "2", "3", "4", "5", "6"} How can I have two strings : str1 = "1, 2, 3" str2 = "4, 5, 6" ...
73 views

### ResamplingMethod -> None in TimeSeries does NOT take any effect in v10.1

Possible bug in v10.1 ResamplingMethod -> None in TimeSeries does NOT take any effect in v10.1. Try: ...
176 views

### Add elements of one list to sublists of another list [duplicate]

I have the following list of sublists with different lengths {{1,1,1},{2,2},{3,3,3,3}} and a second list {4,5,6}with the same ...
82 views

### Is there a way to Collect[] for more than one symbol in Mathematica 10.0?

This question has already been asked three years ago (Is there a way to Collect[] for more than one symbol?) but I'm not allowed to comment since I'm new at Mathematica StackExchange. The first ...
486 views

### Efficient way to perform local Otsu thresholding on image

I have images of cell nuclei that have locally varying intensity distributions. Therefore, I need a robust local threshold algorithm. LocalAdaptiveBinarize works ...
457 views

### Bug in MovingMap (breaking change between version 10.1 and 10.0.2)?

The MovingMap window spec has been changed between version 10.1 and 10.0.2. Version 10.0.2 ...
398 views

### How to generate a random, relatively prime number to p?

I'm sorry if this is an obvious question, but I'm a newbie and googling didn't help me much. Is there a way in Mathematica to generate a number q coprime with <...
86 views

### calculate variance of conditional sum of Normals

Let $\quad W \sim N(\mu_0, \sigma_0^2), \quad X_1 \sim N(\mu_1, \sigma_1^2), \quad X_2 \sim N(\mu_2, \sigma_2^2)$ denote independent random variables, and let $c$ denote a constant. I want to find ...
123 views

### 3D scatter plot with labels [closed]

I am doing 3-D scatter plot with labels and using the following code ...
125 views

### Combining memoization and SlotSequence

I found myself writing memoizing code like this: ...
417 views

### How do I plot a filled cylinder in 3D?

All, I'm trying to plot a filled cylinder in 3D using Graphics3D and then take 2D slices of said cylinder. I know that Cylinder is officially 'filled', but the 2D ...
131 views

### Help in evidencing a region (circular) of a .tiff image and cropping all the rest of the image

I'm asking for the community help since I have problems in cropping an image. I'm having LEED images which are 576*720p, which are made by a big black region at which middle I have the image I'm ...
30 views

### How to use ScheduleTask in a dynamic module? [duplicate]

I have a little timer widget that times two separate tasks: It is simple enough, but I can't see why it's not working. Am I not understanding the connection between ScheduleTasks and Dynamics? ...
71 views

### What is the purpose of Refresh? [duplicate]

I never quite understood the point of Refresh. Why would I do this: Dynamic[Refresh[DateString[], UpdateInterval -> 1]] when it is the same as ...
263 views

### Why don't products of Dirac deltas integrate correctly?

Bug introduced in 10.0.0 and fixed in 10.0.1 The integral $\int \int \ \delta(x) \delta(y) \ dx dy=1$ evaluates to 0 in Mathematica ...
158 views

### How can I easily visualize density plots with singularities with the least loss of detail?

I'm trying to visualize electric fields. StreamPlot is helpful: ...
135 views

### Mean duration between two specific data points

I have dataset such as: ...
45 views

### How can I export a notebook into multimarkdown? [duplicate]

Mulitmarkdown (.md filetype) is a very nice document format that supports rendering mathematical expressions like latex or mathml, rendering syntax highlighted code blocks for any language, as well as ...
130 views

### How to combine selected out cells into a list? [closed]

I have a loop that was printing out results, and now I'm left with many cells in different sections and I need to combine them (the values in them) into a list I can work with. For example, applied to ...
76 views

### Two bit strings represented as lists – how to color differing bits as red while printing?

Assume the following code generatedMsg = {1, 0, 0, 0, 1, 1, 0}; transmittedMsg = {1, 1, 0, 0, 1, 0, 0}; Now, I want to print out something along these lines:  ...
618 views

### How to plot the graph of the equation F[x,y]=0 if y is real number, x is complex? [closed]

I have an equation F(x,y;a,b,c,...)=0, where x and y are variables, a,b,c,... - parameters. y is a real number, x - complex. For every given y I need to solve this equation, i.e. to find Im(x) and Re(...
22 views

### How to monitor parallel mapping a function over a list? [duplicate]

For instance, how to monitor the progress of ParallelMap[function, list]?
315 views

### Is there any faster implementation of DominantColors?

The function DominantColors is a simple function but runs incredibly slow when the number n of dominant colors to find is large - it is currently the biggest bottleneck in my code: ...
55 views

### How do I print multiple slides per page?

I have a Mathematica 10 presentation (not made by me). The slides are very short and very many. I'd like to print it, but printing 100+ pages each with 2 or 3 equations seems like a waste to me. Is ...
72 views

### Why are the labels twitching vertically in TimelinePlot?

Why are labels jumping up and down here: ...
165 views

### Unable to Solve (for arclength parametrization)

I am having trouble with Mathematica while trying to re-parametrize a curve with respect to its arclength. I need to get the old parameter s written in terms of arclength a so the code is ...
226 views

### Filling graph between lines and plots

I would like to create a filling delineated by the plots and lines as specified below: ...
139 views

### Suppressing tiny imaginary parts in complex numbers [closed]

How do I extract the real part of a substitution expression from FindRoot or Solve? Or alternately, how do I insist that they ...
238 views

### Create a list of rules built from data set fields

I want to convert a dataset to a list of features and a list of target values, for use in Predict and also more generally. I know ...
140 views

### Solving equations bounded by a region

Straight to the point I have a function ...
96 views

### How can I get symbolic orthonormal eigenvectors for 3 by 3 hermitian matrix?

Using the following syntax, I can obtain the symbolic eigenvalues and eigenvectors of the following Hermitian matrix (a,b,c,d are all real parameters): ...
38 views

### Strange behaviour of Append [closed]

I have the following situation and I completely do not understand why the second system can be solved but the first (of the same equations, as it seems) cannot. How is it possible? ...
52 views

### How can I give each section a unique <a> tag when I Export as XHTML?

Exporting a notebook as XHTML allows me to override the default HTML tags that are written for section-header-like cells. For example, a notebook cell whose type is "Section", containing text "The ...
142 views

### Make a program that does union of two lists

I have to make a program that gives as a result the union of two lists using a For loop. I can't figure out how to inspect if the elements of a list are different. ...
47 views

### Bincounting multiple data

I have 5number of single column data files and I imported all of them using data = Table[Import["hist501" <> ToString[i] <> ".txt", "List"], {i, 5}]. Now I want to determine the bincount of ...