Mathematica

GeometricTransformation causes dislocated Arrowheads in Graphics3D
Hi, I would like to export some pictures from Mathematica into vector graphics format. I use Graphics3D container and GeometricTransformation command to locate my arrows in 3D space. When exporting this into eps or PDF file format the arrowheads get messed up in the result file. However, using png everything seems... 13 May 2010 08:15

Problem with Nminimize
I have some questions. How could I reduce computation time during working with Nminimize. I mean how to change tolerance or something like this. Is that possible to interrupt the calculation after 2 days in order to give some values? (in some optimization programs it is possible to have not very desired results by in... 17 May 2010 08:00

Part specification... is neither an integer nor a
Add memory to the definition Clear[g] g[0] = 0; g[n_] := g[n] = n - g[g[n - 1]]; g /@ Range[0, 10] {0,1,1,2,3,3,4,4,5,6,6} ?? g Bob Hanlon ---- Chandler May <cjmay4754(a)gmail.com> wrote: ============= Hi Mathematica sages, I want to implement a recursive function on the natural numbers:... 12 May 2010 08:02

Trying to remove item from list of filenames
Hello, I've been stumped on this for awhile. I read in a list of filenames from a directory, using wildcards to capture all the files I want to process. However, a few files make it into the list that I don't want. I these files have extra string of characters, that I should be able to remove using ... 13 May 2010 08:15

Different answer when running cell second time?
If I open Mathematica 7.01.0 (64-bit Linux version) that only contains the following input in a single cell, Assuming[\[Sigma] > 0, Integrate[p/((Pi*\[Sigma]^2)*E^((p^2 - 2*p*p0*Cos[2*(\[Phi] - \[Phi]0)] + p0^2)/(2*\[Sigma]^2))), {p0, 0, Infinity}]] When I hit shift-enter, I get an answer. If I hit, shift-ent... 18 May 2010 07:03

Cardinality Constraints in quadratic optimization
Hello there, I am trying to solve a problem that sounds pretty basic but it is hard to solve. Economically the task is to minimize variance of a portfolio of N assets (N e.q. 200) under some linear constraints and additionally the constraint, that at most K (K e.g. 20) assets get a weight different than zero. ... 11 May 2010 06:45

Interference data in optica
Hello, I am using the FindInterference function in Optica (version 3) and I am able to get a nice plot of the interference function, but when I try and obtain any data from this function- so I can get accurate values for the intensities and fringe spacings (rather than just reading it off a plot) I can't do ... 18 May 2010 02:44

implicit function
Hi. Im newbie in Mathematica Product. I need to draw graph of implicit function. Implicit function have integral,and argument in lower case of it. How can i do this in Mathematica 7.0? functions: x(b,t)=(sqrt(3)-sqrt(3-2b^2*sin^2(t)))/(sqrt(3)+sqrt(3-2b^2*sin^2(t))) Phi(x(b,t))=(1+x)^3*(1-x)*e^(-x) and general e... 12 May 2010 08:02

Part specification... is neither an integer nor a list of integers
Hi Mathematica sages, I want to implement a recursive function on the natural numbers: g(n) = n - g(g(n-1)) g(0) = 0 First I tried the following in Mathematica. g[0] := 0 g[n_] := n - g[g[n-1]] This worked, but it was much too slow. In hopes of reducing the number computations, I thought I would make... 13 May 2010 08:15

Announce: O'Reilly Mathematica Cookbook Published
Mathematica Cookbook contains a variety of ready to use recipes in numerics, data structures, algebraic equations, calculus, statistics, data visualization using 2D and 3D graphic tools, image processing, science and engineering, music and more. There are also recipes related to debugging, testing and MathLink. ... 12 May 2010 08:02