11
votes
2answers
5k views

How to specify assumptions before evaluation?

If I request mathematica evaluate an integral for me, I'll often get a more general ConditionalExpression than I want. Example : ...
2
votes
1answer
184 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 ...
-5
votes
3answers
420 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: ...
7
votes
3answers
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 ...
18
votes
3answers
1k views

Monitor doesn't work with ParallelTable

I can't monitor ParallelTable: Monitor[ParallelTable[Pause[3]; i, {i, 1, 10}], i] just displays i until it is finished. Do ...
1
vote
1answer
407 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 ...
1
vote
1answer
218 views

Version differences in Parallelize

I am having a problem which I guess is due to version difference. I have to generate a list of unitary matrices, which I can do easily. However I came to know about ...
3
votes
1answer
273 views

Exporting lists to files

I am trying to write a program which will generate a list of objects and then exports it in a separate file and clears its memory. As an example I tried the following ...
1
vote
1answer
227 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 ...
11
votes
4answers
496 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 ...
10
votes
1answer
147 views
-1
votes
1answer
280 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?
2
votes
2answers
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 ...
6
votes
0answers
207 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 ...
5
votes
1answer
111 views

How to insert or use the PackageTemplate?

In the system resource file MiscStrings.tr there is a template: ...
4
votes
1answer
294 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 ...
3
votes
0answers
186 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 ...
11
votes
1answer
223 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 ...
4
votes
1answer
349 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 ...
9
votes
1answer
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 ...
3
votes
1answer
356 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 ...
7
votes
1answer
479 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}} ...
16
votes
1answer
470 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 ...
1
vote
1answer
290 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 ...
4
votes
2answers
260 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: ...
5
votes
3answers
589 views

ContourPlot - plot contour lines for minimum of list of functions == 2nd minimum of list of functions

I have a list of (ten or so) functions of two variables (x and y, say). I would like to plot the boundaries on the x y plane where two functions have the same value - but only the two functions in the ...
10
votes
6answers
634 views

How to Map a subset of list elements to a function?

How would you, given a list {1, 2, 3, 4}, apply a function f to 1 and ...
5
votes
2answers
329 views

Rectangle wave OK in calculations, wrong in Plot

I have a Piecewise function consisting of two rectangle waves with different duty cycles: ...
12
votes
4answers
336 views

The gap between MapAt and ReplacePart for 2D data tables with headers

Consider a relational table derived from survey data, where each column ("001-01" ...) represents a responder and each row (...
7
votes
1answer
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 ...
6
votes
0answers
477 views

Optimizing NIntegrate for higher PrecisionGoal

By default, NIntegrate works with MachinePrecision and its PrecisionGoal is set to ...
6
votes
2answers
432 views

How to work out the parameter in a definite integration which has an exact value while the integration doesn't have an analytical solution?

Here is the equation I'm trying to solve: NIntegrate[1/(E^(1/(λ T)) - 1), {λ, 200, 220}] == 1000 T is the parameter I'm ...
7
votes
2answers
625 views

Symbolic manipulation with unevaluated sums

If I have two expressions with sums in them, like this: $$\begin{align*} b&=\frac{\sum_{i} (x_i - \bar{x})(y_i -\bar{y})}{\sum_{i}(x_i -\bar{x})^2}\\ r&=\frac{\sum_{i} (x_i - \bar{x})(y_i ...
11
votes
2answers
885 views

Trying to fit an unknown extreme distribution

First up, I'm quite new to Mathematica so any hints on better code would be greatly appreciated. I have some histogram frequency data from an unknown distribution that I'm trying to fit. Here's the ...
4
votes
1answer
1k views

Solve system of equations related to perspective projection

I'm trying to solve system of equations. I have 4 points before perspective projection and after and I whant to obtain matrix of perspective projection $m_{i,j}$ ($x,y,u,v$ are known , $m_{i,j}$ ...
3
votes
1answer
378 views

Importing file with UCS-2 Little Endian codification

I'm trying to import a text file with UCS-2 Little Endian codification but I can't read it correctly. There's any hidden option to read this files ?? I'd tried with ...
10
votes
2answers
482 views

Proper way to add vertices to an adjacency matrix

I'm looking for a robust way to add vertices to a graph by modifying its AdjacencyMatrix. Here's what I have so far: ...
8
votes
2answers
166 views
10
votes
3answers
489 views

Programmatically quitting the FrontEnd or running without one?

I have a conundrum. I use an iMac's OS X 10.6.8 settings to start and stop the machine at the specific times that I need a particular notebook to run. I've done this because it has worked more ...
1
vote
1answer
413 views

Fastest way to sum pairwise potentials

I've been writing a function to sum a pairwise potential on two lists, i.e. two charged bodies, each containing N >> 1 and ...
2
votes
2answers
504 views

Difference between sub MathKernel and MathKernel

When I try to run Mathematica processes in parallel on a Linux based server, I see that my server allows 7 MathKernels and 28 sub MathKernels. I was wondering what the difference is and how I can take ...
15
votes
1answer
368 views

What is Sub Mathematica?

When looking at the locally available licenses, I see four entries: "Mathematica", "MathKernel", "Sub Mathematica" and "Sub Mathkernel". Now "Mathematica", "MathKernel" and "Sub Mathkernel" are clear, ...
4
votes
1answer
415 views

Multiple simultaneous events in EventLocator method for NDSolve

I'm using NDSolve to integrate a system of ODEs, and EventLocator to stop the integration when it leaves a certain region in phase space. This works perfectly as it should. However, I've also added ...
3
votes
1answer
161 views

splitting a list into files

Given is a list with x, y, z coordinates: {{100, 94, -1.112}, {100.05, 94, -1.112}, {100.1, 94, -0.982}, ..., {100, 94.25, -1.112}, {100.05, 94.25, -0.855}, {100.1, 94.25, -0.728}, ..., ...
8
votes
4answers
608 views

“Evaluating” polynomials of functions (Symbols)

I want to implement the following type evaluation symbolically $$(f^2g + fg + g)(x) \to f(x)^2 g(x) + f(x) g(x) + g(x)$$ In general, on left hand side there is a polynomial in an arbitrary number of ...
4
votes
1answer
310 views

Path queries for tree-structured data

Can anyone suggest documentation or tutorials for developing path queries and indices for (XML-like) tree-structured data? Suppose data is organized hierarchically in key->value pairs, eg: ...
3
votes
2answers
154 views

How to change type order in PearsonDistribution?

I need to estimate a Pearson distribution from a batch of tables tab: ...
5
votes
1answer
231 views

Parts of Module body evaluated in external scope?

I have an expression that suggests that some expressions in a module body are dragging in definitions from outside the scope in a surprising way. First, consider a symbolic constant, ...
36
votes
2answers
2k views

Performance tuning for game solving (peg solitaire | senku)

There's a game I saw at a friend's yesterday, that I often see at people's homes, but never for enough time to think on it too hard. It's called peg solitaire (thanks @R.M). So I came home and I ...

15 30 50 per page