6
votes
2answers
298 views

Force integration to be linear over sum?

Is there an obvious way to force Mathematica to separately integrate the terms in a sum? According to the docs, When part of a sum cannot be integrated explicitly, the whole sum will stay ...
0
votes
2answers
288 views

Fourier-Motzkin Elimination

Is there any method available in mathematica to eliminate variable from set of inequalities? I tried Eliminate function available, but I guess it works on equalities only.
2
votes
4answers
522 views

Highlight integer points in RegionPlot

Is there any way to mark integer points after plotting region in Mathematica? For example, if I: ...
2
votes
1answer
171 views

How to control dependent PopupMenus?

I created three interdependent PopupMenus with names demographic, region and ...
2
votes
3answers
280 views

how to extract some terms out from an expression

I have an expression as below: $-\frac{1}{2} A[a,v] A[b,h] A[c,v] A[d,h] \text{Cos}[\theta ]^2+\frac{1}{2} A[a,h] A[b,v] A[c,v] A[d,h] \text{Cos}[\theta ]^2+\frac{1}{2} A[a,v] A[b,h] A[c,h] A[d,v] ...
8
votes
1answer
1k views

FeynRules vs FeynCalc (or anything else?)

I was looking for a Mathematica package that can take Lagrangians and calculate Feynman diagrams for any given n-point function. (..like if a software can draw and calculate arbitrary loop corrections ...
5
votes
4answers
1k views

Change Style of Points

I was wondering if it's possible to change the style of aPoint with another symbol e.g.: cross, x etc... It may sound weird-it is a Point after all, but I would ...
1
vote
1answer
87 views

How to get a solution involving logs in the right form?

How do I get Solve[(1/9)^(r/2) == 1/n , r] to give me Log[n]/Log[3] and not ...
5
votes
3answers
437 views

How can I set different opacity values for the background of a ListPlot

In the following example: ListPlot[{1, 2, 3}, Background -> Green] how can I set the Opacity[] for the background such ...
2
votes
2answers
239 views

Take part of image under locator

How to create Manipulator with Locator to take part of an image?
4
votes
1answer
223 views

Button doesn't evaluate variable containing Module

I have a huge set of code to accomplish a data transformation. I have saved this set of code as eg: ...
4
votes
2answers
365 views

Rearranging a matrix

I would like to convert a matrix which has a structure like this: {{"A", 10, "D", 1},{"B", 3, "A", 2},{"C", 7, "B", 3},{"D", 6, "C", 4}}//MatrixForm//Print; ...
3
votes
2answers
166 views

Evaluate an ODE for several values of a coefficient and draw all the solutions in one plot

I want to draw one plot showing all the solutions the following ODE with different values of N. How can i do it? ...
3
votes
1answer
443 views

Why am I getting so many error messages from my pendulum simulation?

I'm doing my end of semester project for a physics class. We were supposed to graphically model a physical occurrence; I chose doing a Pendulum Wave. I have my code written, however Mathematica keeps ...
3
votes
1answer
189 views

How to see a long output expression

I often run into long expressions in the process of solving equations. To go forward I need to be able to eye-ball the expressions to make some substitutions or use some existing relations I know to ...
3
votes
3answers
853 views

Non Commutative sorting in Mathematica

I have been trying to do some oscillator algebra in Mathematica and having troubles with sorting and simplifying expressions. I am using the NCAlgebra package which helps to improve the properties of ...
1
vote
1answer
120 views

Simplifying an Integral over Two DiracDeltas

Integrate[DiracDelta[a + k] DiracDelta[-b + k], {k, -\[Infinity], \[Infinity]}] (*DiracDelta[a + b]*) This works fine. But ...
0
votes
1answer
412 views

Nested NIntegrate problem

So I've been trying to evaluate the following integral in Mathematica 8.0 Student version: ...
1
vote
2answers
199 views

A function that only evaluates on lists of pairs [duplicate]

Possible Duplicate: Why doesn’t PatternTest work with Composition? I'd like my function to only evaluate when the argument is a list of pairs. It seems like ...
3
votes
1answer
253 views

Implementing Position

As an assignment I need to re-implement Position. I've managed to do this except for one small thing, the resulting list is not in the current format. The following ...
15
votes
2answers
2k views

How do you deal with very large datasets in Mathematica?

This question is in two related parts. The first is about dataset size, the second data wrangling. Part 1: I've built a naive Bayesian classifier on Mathematica. It uses ...
2
votes
1answer
191 views

Supported options for compiling LibraryLink code with VC++

I have to generate an interface to Mathematica for a fairly large library. I would like to use LibraryLink, as the generation seems much simpler. The platform is Windows (VS 2012), and I am ...
4
votes
1answer
250 views

Integral of integral — it takes too much time

When I evaluate the following expression in Mathematica, it takes so much time that I don't want to wait for the evaluation to complete. So I think that there must be a better approach. ...
0
votes
1answer
126 views

Changing Datelist order

Im wondering how can I formulate a function which receives input in the string format "day.month.year hours: minutes: seconds" (for example, ...
3
votes
1answer
248 views

Quick way to invert a fraction

Over the years of using Mathematica, I find myself doing something along the lines of rewriting this: $\frac{[A^-_F]}{[A^-_U] + \frac{[H^+][A^-_U]}{\kappa_1}}$ as this: $\frac{[A^-_U] + ...
1
vote
1answer
214 views

Functions that operate on symbolic matrices?

I'd like to write functions that operate on symbolic matrices, and do nothing when fed anything else. ...
10
votes
2answers
245 views

Return partial result when MemoryConstrained aborts NDSolve

I use NDSolve to solve a large set (~400) of coupled ODEs. Sometimes, the memory (~4GB) gets filled up, and my computer becomes impossible to work with, because it ...
6
votes
3answers
345 views

Simple blink comparator for two images

I tried to build a simple 'blink comparator' - where you can click on an image repeatedly to switch between two similar images. (An old-fashioned notion in the days of powerful image processing ...
8
votes
1answer
623 views

Mathematica 9 does not read mathematica 8 “.mx” files

Having written a lot of code on M8, I recently switched to M9 and tried to run the code on M9, the code starts by loading an .mx file written by M8, but M9 wouldn't read the .mx file saying that it ...
5
votes
1answer
293 views

Multiple instrument chord

I would like to create a chord using multiple instruments. This started as an attempt to explain music to a friend but my curiosity has taken over. I am familiar with the SoundNote function. I know ...
1
vote
1answer
236 views

Exporting as .PDB extension

I am working with the 3-D coordinates of proteins. The file format I import and modify coordinates of is in the .PDB format, and the string to import is also in this same format. Currently, when I try ...
4
votes
2answers
175 views

How to use Optional as an omissible parameter in pattern-match?

Below is a function intended to test if an expression is a polynomial in which all the coefficients and exponents are integers: ...
1
vote
1answer
364 views

Relative error plot [duplicate]

I was plotting the relative error of the $e^{11/12 -n}n^{n+1/2}$ approximation to $n!$ as $n$ gets larger and larger, and at some very large value of $n$ Mathematica gives this plot: Can somebody ...
7
votes
1answer
809 views

How do I prevent fonts sizes and line weights from scaling in exported graphics?

It's common to export graphics from Mathematica that are subsequently scaled to various sizes that cannot (at least not conveniently) be anticipated. This is problematic in cases where (as is common) ...
9
votes
1answer
325 views

Verifying and deriving basic (block) matrix identities

How can I use the new symbolic matrix/tensor capabilities to verify matrix identities, such as (1) or (2) Even better, how can I ask Mathematica to derive expressions for X, Y, Z, and U like ...
9
votes
2answers
599 views

Solving/Reducing equations in $\mathbb{Z}/p\mathbb{Z}$

I was trying to find all the numbers $n$ for which $2^n=n\mod 10^k$ using Mathematica. My first try: Reduce[2^n == n, n, Modulus -> 100] However, I receive ...
1
vote
2answers
252 views

Simplify the multiplication such as $a*(b+c)$ to $a*b+a*c$

I am trying to solve this problem here but have to understand basics. Suppose I have a multiplication such as $a*(b+c+d+...+x)$. How can I multiply it to the result $a*b+a*c+...+a*x$? Trials ...
3
votes
2answers
428 views

Removing an extra curly braces when using Grid with an If statment

I use Grid to align controls in Manipulate. Here is a simple example ...
15
votes
2answers
4k views

Solving the Travelling Salesman Problem

I've been trying to find some kind of mathematical computer software to solve the Travelling Salesman Problem. The Excel Solver is able to do it, but I've noticed there is a built-in function in ...
5
votes
2answers
282 views

How to solve this combination equation?

I want to solve the equation $$ 2n\cdot\binom{n}{0} + 5(n-1)\binom{n}{1}+13(n-2)\binom{n}{2}+\cdots + \left(2^{n-1} + 3^{n-1}\right)\binom{n}{n-1} = 1685. $$ or using alternative notion for binomial ...
3
votes
3answers
210 views

Need Help Writing (a Pascal) Matrix in Mathematica

I want to write a function $f[n]$ in Mathematica which gives me an $n\times n$ lower triangular Pascal matrix with a row of zeros in between each nonzero row. That is, I want the matrices ...
1
vote
1answer
814 views

How can I understand the result Mathematica returns from DSolve?

I have solved an ODE using DSolve, but I have a problem with understanding the solution. In general the solution is in the form: ...
4
votes
2answers
680 views

Exact cover solution

Is it possible to get a exact cover solution(s) and/or number of possible solutions in Mathematica?
3
votes
0answers
305 views

Microsoft SQL DatabaseLink connection using Windows Authentication from Mac

We know that Mathematic doesn't natively support Windows Authentication connect. But as we can see in this post, the problem can be easily solved when your Mathematica is in Windows version (I have ...
7
votes
1answer
231 views

How to make this code threadsafe?

I have the following code, schematically: ...
3
votes
2answers
535 views

a problem about simplifing conjugate

the situation is as follows ...
27
votes
2answers
650 views

Counting radial ridges on an image

After happily using the v9 image assistant to crop elliptically an image, and then the drawing tools to put a white disk in the middle, I turned this image: into the following one: that can be ...
-1
votes
1answer
943 views

Creating a Logarithmic Scale Plot

I am trying to plot a function on a Log scale, but am not getting the correct looking output. Any ideas on what could be wrong. ...
10
votes
1answer
607 views

Test if argument is inside domain of InterpolatingFunction

The documentation says In standard output format, only the domain element of an InterpolatingFunction object is printed explicitly. The remaining elements are indicated by <> But this is not the ...
1
vote
1answer
582 views

Importing formatted, highlighted text from : HTML vs RTF vs. XML

We would like the ability to import and analyze ASCII documents that have been manually segmented by highlighting and changing font colors of various sections, eg: The original line breaks, ...

15 30 50 per page