2
votes
3answers
239 views

Adding elements in the sublists

How can I add the elements in the sublists? For example, if I have the list which is m={{1,3},{2,3},{4,1}} then, the output that I want is ...
5
votes
1answer
600 views

Rasterized image together with vector-graphics axes

Following some of the questions here on Mathematica Stack Exchange, I am trying to export an image that contains a rasterized object and vector-graphics axes. Here is an example: ...
8
votes
1answer
386 views

Enhanced “Complete Selection” (dynamic autocomplete) for Text input?

The autocomplete ("Complete Selection") feature Ctrl-K (or F2 on Windows) works fine for functions and code input. Is there a way to enhance it for text input? Today’s standard (see e.g. OpenOffice ...
3
votes
2answers
277 views

Deleting a row or column of an adjacency matrix while maintaining the associated label

I am currently working with a weighted adjacency matrix for a directed graph, and it contains several 0 columns and rows. With the unaltered matrix, I am able to monitor the relations between vertices ...
9
votes
1answer
239 views
5
votes
1answer
383 views

Numbering element in descending order

How can I numbering the elements in descending order of second elements of sublists? For example, if I have the list which is ...
3
votes
1answer
218 views

Debugging graphics

All the examples I am seeing on internet are related to normal functions that carry out loops and assignments but I have not seen one example where I can see a graphics based program being debugged. ...
4
votes
1answer
342 views

Plotting an inequality with “plot” axis

Whenever I try to plot an inequality with "RegionPlot", all my plots come out in boxed frames. Is there a way to plot inequalities where I get my standard x and y axes crossing each other? For ...
2
votes
0answers
867 views

Set Global Maximum Precision

I'm sure this has been asked before, but I've looked around and can't figure it out: How do I set a global maximum precision for a notebook (or in general, globally)? I have a large notebook in ...
4
votes
1answer
250 views

Maximizing functions with Which statements

I'd like to be able to find the maximum value that my Capex function (see below) generates. This is a fairly simple function so I could just add it up but I have more complex functions of a similar ...
6
votes
1answer
150 views

How can I restore context menu functionality to a Manipulate that contains Locators?

Before adding a Locator to a Manipulate, I can easily print or export the result using a context menu: But after adding a ...
2
votes
1answer
801 views

Using triangulation

I have been presented with 3 known points and the power densities at those points. I need to use those points to find the location of the actual antenna which is generating the signals. Power ...
20
votes
2answers
1k views

How to quickly calculate intersections of filled curves?

I am trying to quickly calculate the intersection of polygons with more than 6,000 points. A compiled solution would be preferable. Here is one example of the problem: ...
4
votes
1answer
1k views

Visualize eigenvectors at specified points?

I am very new to Mathematica and I got stuck about visualizing eigenvectors 2D and 3D. I want to visualize my largest eigenvector field of tensor data(15x15). I wrote this code for instance : ...
5
votes
1answer
184 views

Why are my images not printing at the expected size?

I understand how (in theory) to get images to be a specific size in inches, but when I follow the documentation, all of my output seems to be scaled down by a factor of a bit less than 70% (e.g., ...
3
votes
1answer
340 views

using interpolation functions in ParallelMap

Edit I am editing the question to give a simple workable example. It is at the bottom under the heading Example. The original question is now headed withe Background. Background I am trying to ...
8
votes
1answer
959 views

Implementation of Incomplete Fermi-Dirac Integral in Mathematica

I'm working on a special algorithm to implement a more accurate effective mass calculation for hole carriers in silicon in Mathematica. This rather involved algorithm uses incomplete Fermi-Dirac ...
4
votes
2answers
509 views

DisplayFormula not working as expected

How do I use the styles "DisplayFormula" and "DisplayFormulaNumbered"? Why is there no margin (or empty space) around the ...
2
votes
1answer
129 views

Implementing a For (?) or series or loop (?) for individual results for every x to n

I'm working on improving a modeling formula and have spreadsheets worth of data to use, but my work so far has been quite tedious. I'm essentially pulling 20 rows of data from each separate sheet of a ...
3
votes
0answers
211 views

Mathematica Complains about Non Symmetric Covariance matrix, when it's not the case

I was doing some fitting with Mathematica7 using NonlinearModelFit. It's quite long the program to do the fit and that's why I am not displaying here ... It goes ok, and I can get the fit parameters ...
3
votes
3answers
216 views

SetAccuracy behavior

I'm puzzled by the output I get from SetAccuracy. According to the documentation, when SetAccuracy is used to increase the ...
6
votes
1answer
392 views

How do I constrain the region where I can drag a Locator?

How do I constrain the region where I can drag a Locator to conform to rules, including rules that apply to computations resulting from the value of the ...
1
vote
1answer
461 views

Lines with label in Plot options syntax

I wrote a little function to add lines with labels to plots. It just creates customized {GridLines -> ..., Epilog -> ...} code: ...
5
votes
3answers
4k views

Local max/min of Mathematica data sets

Is there a way in Mathematica to find the local maxima of a set of points? Suppose you have ...
8
votes
1answer
562 views

Is there any automatic differentiation package?

I'm wondering if an automatic differentiation package exists for Mathematica. This is what I mean by automatic differentiation.
3
votes
0answers
263 views

How to save (large) data generated from simulations

The following is a simple example of a much larger simulation that I want to run Define some processes ...
6
votes
2answers
283 views

A good way to manage code in a complicated CDF?

When doing complicated programming in a Mma notebook I define several functions that I use in my higher level funtions, and I use a "Subsection" cell for each definition. For example I might write: ...
3
votes
1answer
353 views

How to implement Condition programmatically?

I am writing my own symbolic functions with custom symbolic properties. So often I wish to introduce some automatic simplifications or evaluations, which return the same head as it's argument. This ...
0
votes
1answer
80 views

What exactly happens when adding a Blank after a built-in function used in the rules of ReplaceAll?

Well, this question is just for curiosity, personally I never use ReplaceAll like this: ...
1
vote
1answer
885 views

How to find local minima of a multivariate function with singularity?

I am working on a logistic regression problem which requires minimizing a cost function J[{theta0, theta1, theta2}, X, y] to find the optimal value for fitting ...
0
votes
1answer
177 views

how to get modify the following correlation matrix with a specific list of financial prices?

The following takes the last 5 members of the Dow Jones index and plots the correlation matrix of the last 5 years of daily prices: ...
2
votes
2answers
704 views

Problem with NDsolve for a system of equations

I want to solve a system of differential equations which is not very complicated, but I cannot handle the problem with mathematica!! Please have a look at the problem and result and help me with your ...
5
votes
0answers
104 views

Doing computations in a modulo ring

I need to perform some computations in a modulo ring, like Mod[Subfactorial[n], m] Mod[Binomial[n, k], m] However, this is obviously much too slow for large ...
5
votes
2answers
698 views

Can the CholeskyDecomposition function in Mathematica be made to work on non-symmetric matrices?

The CholeskyDecomposition[m] function in Mathematica requires a symmetric and positive definite matrix m. For instance, the ...
12
votes
1answer
1k views

3D plots with parallel projection

It is easy to make 3D Plots with Mathematica, e.g. use: Plot3D[Sin[x+y^2],{x,-3,3},{y,-2,2}] But I want to have nice plots in my thesis, so I decided to use ...
4
votes
1answer
109 views

Setting a binary operator Flat

I defined a binary operator in as the first statement in a new Mathematica notebook. {x1_, y1_} ⊕ {x2_, y2_} := Module[{}, Print["do anything"];] where the code ...
8
votes
2answers
318 views

Why doesn't FindClusters find any clusters in this case?

I am trying to use FindClusters to segment data points into similar numbers but so far I couldn't get it work for this example: ...
2
votes
1answer
557 views

Tridiagonal matrix for any n

I'm pretty new to Mathematica and I need to figure out how to create a $n\times n$ tridiagonal matrix for any $n$. I don't have the slightest clue where to begin. Edit: got this far, not sure how to ...
0
votes
0answers
68 views

How to create a dynamically self-updating table of content for a notebook? [duplicate]

Possible Duplicate: Generating a table of contents How to create a dynamically self-updating table of content for a notebook? The TOC should contain the titles for the section, subsection, ...
2
votes
2answers
298 views

local variable naming & symbolic argument

I'm stuck here with my variable assignment in this scenario ...
1
vote
1answer
750 views

Using singular value decomposition for graph clustering

I have a fairly large graph (50-60 vertices) with directed, weighted edges, and I am attempting to cluster the vertices. Prior to this, I have only worked with undirected graphs having symmetric ...
4
votes
1answer
271 views

Use single ListPlot for multiple sets of data (on separate graphs)

This is the code I have working for a single set of data. Is there a way I can structure this to have multiple sets of data? ...
6
votes
2answers
350 views

A command for outputting a list of parameter values in a Manipulate interface

I am looking for a command that will output a list of values that correspond to the current parameter values manually set on a particular Manipulate interface. For ...
5
votes
1answer
2k views

How to create symbol whose name has subscript?

I can do Symbol["foobar"] to create a symbol foobar. How to create a symbol $\theta_1$? ...
0
votes
2answers
175 views

Time varying equation plot [duplicate]

Possible Duplicate: How do I use Map for a function with two arguments? I have a function, e.g. $T(x,t) = \exp(-t)\sin(x)$ and I want to plot, on the same, or different graphs, $T$ as a ...
0
votes
0answers
126 views

How to set Math text size & line spacing [duplicate]

I have chosen different font for text. Unfortunately this font is larger than the standard Times font. So all math symbols (e.g. greek) are now a little too small. If I could just set the FontSize for ...
2
votes
0answers
201 views

Reference request for logic programming in Mathematica

I'm learning Mathematica(v8) to use it to program formal logic. Can anyone recommend a logic-specific tutorial text? A reference list of logic-related functions would also be very appreciated!
21
votes
6answers
1k views

How to improve the performance of solutions to Project Euler (#39)?

This is the problem 39 of Project Euler, which I asked in the chat room two days ago. My original code runs as slowly as snails, and finally I got two answers from JM and Rojo. Unfortunately, both of ...
4
votes
2answers
671 views

How to make a function that evaluates an expression?

I'm trying to make a function where the input is an expression, but somehow it just won't be evaluated. For example, this little function doesn't work: ...
2
votes
1answer
444 views

Plugging values into functions

I am very new to Mathematica, and need to know how to plug values into existing functions. For example, Math World supplies the following code for building a truth table of ...

15 30 50 per page