# All Questions

399 views

### Smoothing a single rectangular pulse in NDSolve

Hello I am interested in smoothing out the sharp edges of a single rectangular wave centered at the origin. I am looking for a smooth function that looks almost exactly the same as the square wave ...
553 views

### Solving vector equations

I made this very simple module to try and solve vector X: ...
76 views

### ClusteringComponents returning only ones

I am trying to use ClusteringComponents without having to specify the number of clusters initially... so the algorithm can find itself the optimal number of clusters... My data is of the form: ...
290 views

### How to highlight the feature edge of an image with draggable select lasso?

As shown in the picture, i want to know if it is possible to: 1) recognize the feature edge like face,nose,eyes,mouse,etc. 2) highlight the feature edge with draggable select lasso, 3) return the ...
177 views

### Efficient way to obtain values of a function defined by an Integral

Consider the following equation: $$S(q)=\frac{(4 \pi \rho ) \int r (h(r)-1) \sin (q r) \, dr}{q}$$ I want to numerically obtain values for $S(q)$ given that I have data points representing $h(r)$ ...
88 views

Given ...
562 views

### A femme is a wife is a Frau

As can be seen from LanguageData["Properties"] // Multicolumn Mathematica's translation capabilities seem to be very limited. It can translate month names, ...
2k views

### Fitting ellipse to 5 given points on the plane

Five points are required to define a unique ellipse. An ellipse has five degrees of freedom: the $x$ and $y$ coordinates of each focus, and the sum of the distance from each focus to a point on the ...
162 views

### How to include confidence intervals into ProbabilityScalePlot?

I use ProbabilityScalePlot[data, "Weibull"] to plot measured data and ...
160 views

### Graphicsrow title [duplicate]

I made the following graphic with Mathematica 9.0: Does anybody know how to put a title on the top of the whole graph? (not in each single plot). Basically I used ...
195 views

### Increasing MaxPoints in NDSolve results in memory issue

I am interested in increasing "MaxPoints" in NDSolve's "MethodOfLines" in attempt to increase the resolution of the plot of the solution of linearly damped wave equation with transparent boundary ...
158 views

### Function to Expand exponentials

Is there a function similar to PowerExpand which expand exponentials? This would, for example, take Exp[5(a + b)] and ...
99 views

### Speedup of KL Divergence by Monte Carlo Simulation

I started with Mathematica about just a week, so I don't know how to take all of this environment. What I want to know is if there is a way to speedup my code to compute the KL-Divergence of Gaussian ...
134 views

### Region plot of transformed region giving odd result

I tried applying a transformation to a rectangle: RegionPlot[TransformedRegion[Rectangle[{0, 0}, {1, 1}], {#1^(1/3) + #2, 1 + #2} &]] giving In reality, ...
232 views

### Orthogonal vector in two dimensions

Maybe this is really basic, but I couldn't figure it out. I would like to find the "hat vector" of a vector I defined: it's a vector orthogonal to the given one, assuming two dimensions. So for ...
144 views

### Save associations to a file and reload

I have many (say 2 for now) associations that I want to save to a file ...
154 views

### getting at the right parts of a list

I have a way to solve my problem, but it seems like there should be something better. Also I realize that I probably don't have a good enough handle on how to get at parts of lists the way I need to. ...
1k views

### Around the Clock

I want to produce with Mathematica something like this Or this 12 hours should be arranged in a pleasing ("rotated") style around / within a rectangle. I don't ask for the hands - depending on ...
191 views

### Change last column of a matrix

Given a (rectangular) matrix of integers, i.e. RandomInteger[4, {10, 3}] I want to apply the following rules only to the last column ...
274 views

### Latin Hypercube Sampling

I'm looking into Mathematica and I can't find if there is an instruction or a set of them that can perform the Latin Hypercube Sampling, given variable, their ...
75 views

### Use modified part of file path as new file name

i want to import an image, modify it and then export the modified image. Something like this: img = Import["C:\\Images\\e4271-5.jpg"] Some modifications ...
67 views

### Is there a way to logically test an optional color input inside a module? [duplicate]

Suppose I create a Module that is expected to return a graphic that I will later use in a plotting procedure (e.g., with ...
42 views

### How to do replacements in Compile'd code? [duplicate]

I want to do something in the spirit of this code: ...
260 views

### Mathematica integration failure - new or old?

Bug introduced in 7.0.1 or earlier, persists through 10.1 Consider the following integral: Integrate[Log[a Cos[x]^2 + b Sin[x]^2], {x, 0, 2Pi}] This takes a ...
701 views

### How to solve a nonlinear coupled PDE with initial and some boundary values

I would like to solve the following nonlinear coupled PDE with a mix of initial conditions and boundary values: ...
148 views

### No solution with DSolve

I have been trying to solve the following system of ODEs: \begin{eqnarray} ...
623 views

### Adding labels and numbers in axes

Let's see the following test case ...
345 views

### Enumerating all connected graphs with 9 vertices

The version of my Mathematica is 10. I generate a connected graph with 9 vertices, but find that it is not included in Mathematica. ...
301 views

### How to transform a matrix to upper-triangular with operation- tag elegantly?

Description: Recently, I have a thought that writing a function to show the transformation process when a matrix is transformed to upper-triangular. My trail ...
220 views

### graphicsgrid white space

I'm working with mathematica 9.0 making a graphic grid. Here's my image: I'd like to know if it's possible to make the two cells from right only one and if there's some manner to rid of the white ...
117 views

### Get Documentation Search Results Programmatically

Currently I don't have access to Wolfram Workbench but would like to add my own pages to the documentation search results in Mathematica. How might I most easily manually add pages to the ...
179 views

### Switch actions of Shift+Enter and Enter in notebook interface?

How can I switch the functionality of the Enter and Shift+Enter key combinations in Windows? I find Matlab's interface more intuitive sometimes. By default in Mathematica's front-end, the ...
497 views

### Convert imported PDF to an image

I've looked through the forum and have not seen an answer for this. I would like to be able to import a pdf document in which each page contains an QR code. I want to then use the Barcode reader ...
671 views

### Join lists with nested list

Is there a way of smarter way of joining list of the form l1 = {a,{b,c}}; l2 = {d,{e,f}}; l3 = {g,{h,i}}; To obtain ...
110 views

### Why does my dataset lose its typesetting when I add columns?

I've tried multiple methods of adding and removing columns to a dataset, but it seems no matter which way I choose I can't get the data to typeset as a table. Here's my initial dataset: 1) ...
104 views

### Substitution of a function in a differential equation

Suppose we have a differential equation as follows: g[t_] := t/2 m[t_] := t/3 A[t_] := {{g[t], 1}, {1, m[t]}} p'[t] == A[t]. p[t], p[0] == {1, 0} ...
250 views

### Trying to write out the prime factorization of a number with CenterDot and Superscript

I am trying to use CenterDot and Superscript, in conjunction with Apply to write out the prime factorization of any given integer. Everything works well UNLESS the prime factorization of the number ...
324 views

### Output is Input for a Differential with Sign?

Here's the problem: For one of my classes, we're supposed to use Mathematica to solve the equation y''=y-b*y' for a variety of b values and specified boundary conditions and plot the outputs. There I ...
229 views

### Remove Successive Duplicate From A Large List (200k by 4 matrix)

I am interested in removing successive duplicate rows from a very large list (~200k rows by 4 columns) using Mathematica.The built-in 'DeleteDuplicates' seems to remove all duplicates, I am interested ...
139 views

### Series expanding an expression to an arbitrary power

How can I get Mathematica to directly produce the series expansion of an expression such as $(1+1/x)^n$, where $n$ is an arbitrary positive integer? Note that it's important in my expression to keep ...
453 views

### graphics grid legend

I'm working with mathematica 9.0 and I want to make a graphic grid containing 3 different plots. My problem is that when I use plotlegend to label the plots the legend does not show up or the left ...
184 views

### Tube and CapForm

Bug introduced in 10.0.0 and fixed in 10.0.2 I am using version 10 to draw tubes. With the CapForm set as Butt the first pipe is as expected but the bent pipe has one rounded end. Is this a bug? ...
73 views

Looks to me that the FITS Export is borged. Here is the problem: When I export out images with accustom metadata into a FITS file, Mathematica truncates and overwrites it. Here is the metadata I ...
317 views

### Help in Bifurcation Diagram

My dears, I need to plot a bifurcation diagram for the following non-linear systems represented by the next Mathematica code ...
109 views

### Evaluating arguments of module (inside compile)

Note: this is a clarification of 2 earlier unanswered questions, Compile issues, scoping and order of evaluation and Optimising a simple computation with vectors . The problem I have a list of ...
130 views

### Real time visualization of parametric plots

I wish to see the following curve develop in real time. f = {Cos[s/Sqrt[2]], -Sin[s/Sqrt[2]], s/Sqrt[2]} ParametricPlot3D[f,{s,-2Pi,2Pi}] I tried to get ...
65 views

### Finding related roots to a polynomial

I posted this in math.stackexchange, but this might be a better place. Assume that $f(X,Y,Z,V,W)\in \mathbb{Z}[X,Y,Z,V,W]$ is some polynomial and assume that $f(x,y,z,v,w)=0$. I would like to know if ...
123 views

### Weird glitch again!

I have been struggling with these glitches for two days... A related question I asked is here How to eliminate the white gaps in the graph Here is the code, ...