# All Questions

209 views

### Evaluation of self-defined functions

I defined a function that I call disc which I want to minimize later. The function is defined as ...
392 views

### How do I use a matrix that has a variable?

I seem to be getting an error whenever I try running this piece of code. Matrix12[n_] := {{1, 0}, {0, {\[Kappa]1[n]}/{\[Kappa]2[n]}}} I've already defined the ...
473 views

### How to ensure that Polygon[list] plots a simple polygon?

Consider the following code which plots a triangle. p = {{0, 0}, {.2, 0}, {0, .2}}; {Cyan, Polygon[Dynamic[p]]} // Graphics Then adding (for example) ...
9k views

### How to check if a 2D point is in a polygon?

Background: I use code from An Efficient Test For A Point To Be In A Convex Polygon Wolfram Demonstration to check if a point ( mouse pointer ) is in a ( convex ) polygon. Clearly this code fails for ...
182 views

### Orthogonalize method, keeping to binary vectors

The built in function: Orthogonalize[m] where m is a list of vectors returns a orthogonal basis for m. However, I want to stick to the binary field. However, I ...
728 views

### Span of a set of vectors over a given field

Could anyone help me find a function that takes as inputs: a set $S$ of vectors and an integer $q$ and outputs: the Span of $S$, where $Span[S]$ is a vector space over the field $F_q$. If its ...
167 views

### Using patterns in ReplaceAll to extract elements from tuples at arbitrary depths

Please consider the following: I need to extract from MyList all last parts of each 3-tuple. ...
232 views

### Strange results while nesting scope constructs?

I did a handful of tests with Block, With, and Module and had a couple of new surprises. ...
262 views

### Speed Up SphericalPlot3D

I was wondering if I could speed up SphericalPlot3D? I tried editing PlotPoints, and ...
135 views

### How to switch between different CDFs in CDF Player?

I recently got a Mac. It has CDF Player, but not Mathematica. How do I get CDF Player to switch between different CDFs on OS X Lion? Edit I forgot to mention that I want to know how to switch ...
227 views

### Simpler way to repeat an execution with 2D points?

q has the coordinates of quadrilateral. I can get the output below with brute-force but I want to find a simpler solution, perhaps something like f<-q[[1;;2]]. ...
439 views

### Compiled function error - nontensor object created

I'm trying to optimize code that uses Position MANY times. The following toy code works: ...
225 views

### How can I permute a multiset?

I have a multiset {1, 3, 3, 1, 2} and would like to randomly permute the classes like so: {2, 1, 1, 2, 3} or {3, 2, 2, 3, 1}, what is the simplest and most efficient way to do this? In reality the ...
199 views

### Page Break Adjustment In Long Documents

Has anyone else had trouble in relocating page breaks in a long document? In a ~45 page long document I wanted to keep certain things on the same page. The system worked on the first three or four ...
213 views

### Evaluation of Notebook chosen by FileNameSetter

Please consider the following: I have created a GUI where I can choose the path of a notebook (which I need for later calculation) via ...
183 views

### LeastSquare Solution for the Continuous Time Lyapunov Equation

I have been working with a problem which involves solving the continuous time Lyapunov equation $$A R + R A^\top = G$$ for the symmetric positive definite matrix $R$. Here $A$ is real, invertible ...
272 views

### Why is the CTRL + / not working?

I've learned how to use this shortcut to input fractions in the 2D form, it worked nice on my notebook but I can't make it on my desktop. Any tip on what could be happening?
289 views

### Mathematica's external controllers?

While reading the Manipulate reference I've noticed this line: What are the available external devices for that? Some months ago I was thinking on what would be needed to use a MIDI Controller ...
760 views

### Map a 3D plot into plane

I have a 3D plot like: ...
111 views

### How to insert or use the PackageTemplate?

In the system resource file MiscStrings.tr there is a template: ...
180 views

### Enhancing GraphUtilities' GraphEdit

One thing I use Mathematica for is building molecular graphs. Until now, I've been content with generating an adjacency matrix from SMILES data, and passing that to ...
485 views

### Assessing argument type in set delayed function definitions

I'm wondering how to properly assess the type of arguments passed to functions defined with :=. I want my functions to be the most efficient, unambiguous and clear ...
221 views

### Programmatically minimize mathematica?

I can minimize a notebook easy enough with Mathematica code, but how does one minimize all of the Mathematica front end? Just as if you clicked the minimize button on the menu bar? This is for ...
343 views

### Importing tabular data that has been exported from Evernote

In Evernote you can embed HTML tables in the note. You can then export them to an xml format with the extension enex. I am trying to get the data from the table imported into Mathematica. Here is the ...
910 views

### Drawing outside Plot area

I want to programmatically draw some objects outside the Plot area in my Plot's Epilog, like in this dummy: I found PlotRangeClipping and hoped that would be the ...
147 views

### Notebook with a WindowOpacity too small becomes “click-through” for mouse

I created a notebook and was manipulating its WindowOpacity option: ...
178 views

My code: ...
6k views

### Programmatic approach to HDR photography with Mathematica image processing functions

The High dynamic range imaging (HDR or HDRI) direction in photography and image processing became very popular recently. Besides obvious photo art applications (see examples), there are many great ...
3k views

### Complex number operations: telling Mathematica variables are real

I want to do Conjugate[a + b*I], but when I do that, the solution is Conjugate[a] - I*Conjugate[b]; when for me, a and b are ...
344 views

### How to highlight various parts of a plot

I'd like to show students a graph of a function, say $(x,y)\mapsto\sqrt[3]{x^3+y^3}$, and then highlight its various properties connected with (non)differentiability at certain points etc. Having ...
792 views

### Programmatically move the cursor to a desired location on the screen

Is it possible to set/move the mouse pointer's location directly from Mathematica without using external tools like Run["xdotool mousemove x y"]?
537 views

### Take screenshot of the entire desktop using Mathematica

Is it possible to get a screenshot of the entire desktop directly in Mathematica? I am on Ubuntu running Mathematica 8. For some reason GUIScreenShot[] fails. But ...
454 views

### Very fast way to do a coordinate frame transform

I need a function that rotates and translates a huge amount of line segments. For example, I have a set of line segments in the form {{x0,y0,z0},{x1,y1,z1}} ...
462 views

### Is it possible to produce anaglyphs with Mathematica?

I'd like to prepare some presentations in Mathematica to help students visualize functions of two variables (it's a usual calculus course). I thought it would be both cool and useful to have the ...
273 views

### Omit part of a 2D plot [duplicate]

Possible Duplicate: Generating a broken or snipped axis in ListPlot I am interested in removing a part of my plot, after searching around I could not find any questions concerning this ...
434 views

### Unique[] symbol not properly tracked

In a nutshell, why does this work (change y and see how the value updates) ...
698 views

### Reversing one axis in Plot3D

When I rotate my 3D plot to the desired viewpoint my X axis runs from 1 at the left to 0 at the right. How can I mirror my plot so that 0 will be at the left and 1 at the right? Extra credit: how ...
252 views

### Creating a Nearest function programmatically

I've been trying to work out how to create a Nearest function programmatically. My goal is to produce something similar to this, a hand-assembled function: ...
2k views

### Change variables in differential expressions

I have a fairly complicated differential expression in terms of a variable r and two unknown functions of r, B[r] and n[r]. I want to do a Taylor expansion of this around r=infinity. I want to do this ...
3k views

### Plotting contours plot for f(x,y,z)=c

I have the following question: I have a file that has structure: x1 y1 z1 f1 x2 y2 z2 f2 ... xn yn zn fn I can easily visualize it with Mathematica using ...
411 views

### Constructing lists by applying functions to another list

Suppose f is a function of two variables: $f = f(x,y)\quad$ and $L$ is a list. Could someone help me in defining a list of the form: $D = \{f(x,y)\ |\ x \in L,\ y \in L\}$ I tried this: ...
124 views

### Importing parts of Packages

Some programming languages offer the possibility of importing a single function from a library, as in from x import y I'm looking to import only one function ...
324 views

### Rectangle wave OK in calculations, wrong in Plot

I have a Piecewise function consisting of two rectangle waves with different duty cycles: ...
553 views

### Expected Value: Strange/unexpected result

Assume $X$ is an exponential random variable with unit mean ($f_X(x)=e^{-x}$, $x>0$). I want to calculate the expected value of $\frac{1}{X}$. Since $X>0$, I am expecting that ...
1k views

### Sum or Product with Exclusions

Is there a built-in feature for handling things like: $$\sum_{i=0}_{i\ne j}^n\frac{a-a_i}{a_i-a_j}$$ and $$\prod_{i=0}_{i\ne j}^n\frac{a-a_i}{a_i-a_j}$$ or should I work out some sort of ...
124 views

### How can a Button be shifted to perform its action

I have a Panel with 4 Inputfields and a Button. When a ...
785 views

### Open two copies of the same notebook

Is there a way to open one notebook in two (or more) different windows? This can be helpful when working with a long notebook and one wants to edit one part of it while looking at a different part. ...
703 views

### I failed to solve a set of one-dimension fluid mechanics PDEs with NDSolve

The fluid here has been assumed as single component perfect gas i.e. it obeys the equation $p=ρ R T$, the thermal conductivity is assumed as a constant, so the equation set is: ...