Mathematica

pursuit curve (differential equations)
hi i am doing pursuit curve in mathematica.. for instance, fox is chasing a rabbit - rabbit has a certain defined path (for example - a circle {cos(t),sin(t)}. fox always heads directly toward the rabbit. k - relative speed fox/rabbit p,q - rabbit's path (for instance a circle {cos(t),sin(t)} x,y - fox's path ... 23 Jan 2007 04:37

speed of multiplying polynomials
Hi, I'm trying to figure out how fast mathematica can multiply polynomials with integer coefficients. I don't know mathematica well at all, but I had a friend write me a mathematica program to test this. It look like on a regular desktop machine it can multiply e.g. degree 1000 polynomials with coefficients in t... 20 Jan 2007 03:11

Minimization with constraint expresses as CDF[] >=
Hello, I have the following optimization problem: a minimization subject to a few linear constraints and one chance constarint formulated using CDF[] Needs["Statistics`MultinormalDistribution`"]; r={{0.01,-0.016},{-0.016,0.018}}; ndist=MultinormalDistribution[{1,3},r]; NMinimize[{2x1+x2, x1�0.8, x2�2.5, x... 31 Dec 2006 05:44

webMathematica problem
Hi there, I can't run my webMathematica due the following problem? Can anyone tell me the cause and solution to the problem? Thanks, David HTTP Status 500 - ________________________________________ type Exception report message description The server encountered an internal error () that prevented ... 3 Jan 2007 01:20

WebMathematica problem
Hi there, I have a problem with my webMathematica. Can anyone tell me what is the cause of this problem? Can anyone guide me through email to solve this problem? HTTP Status 500 - ________________________________________ type Exception report message description The server encountered an internal err... 15 Dec 2006 07:49

transcendental equation
Why Solve cannot deal with the following transcendental equation? Solve[{2^x + 4^y == 9, x == y}, {x, y}] \!\(Solve::"incnst" \(\(:\)\(\ \)\) "Inconsistent or redundant transcendental equation. After reduction, the bad equation is \!\(Log[2\ \^x]\/Log[2] - Log[2\^y]\/Log[2]\) == 0"\) Solve::ifun: Inverse... 16 Nov 2006 01:47

Possible simple bug in NMaximize
(* does not work *) func = Hold[NIntegrate[t^3, {t, x, 0}]]; NMaximize[func, x] (* works *) func = Hold[NIntegrate[t^3, {t, 0, x}]]; NMinimize[func, x] $Version 5.2 for Microsoft Windows (June 20, 2005) ... 8 Nov 2006 07:04

Warning Message wrt NMinimize function
Hello Everyone, I want to use NMinimize to solve an optimization problem. In essence, I'm trying to numerically minimize the "sum of a square of errors" for two lists, aa and bb (earlier generated lists of n elements or points), using the below syntax: NMinimize[{Plus @@ Table[(aa[[i]] - bb[[i]])^2, {i, n}... 22 Sep 2006 01:48

(again) common problem with FindMinimum and NIntegrate
Sorry, there was a missing line in the code (some data). It is correct as it appears below. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% Hi everyone, Some people have enquired in the past about how to avoid error messages similar to this one I get: NMinimize::nnum: The function value Experimental`Numer... 15 Sep 2006 07:03

line thickness 2D plot legend
For a 2D Plot in Mathematica: How can I modify the line thickness in the legend of a 2D Plot. The lines in the plot can be made thickner through PlotStyle->{Thickness[0.08]}, but this does not influence the legend. How can I change the line thickness there? ... 21 Jul 2006 18:05