Mathematica

plotting many curves
Hello Group, I know I should avoid For cycles in mathematica, but I am C person... how to do this without For (*--------initialization------------------*) n = 10^2; xoi = RandomReal[{-10, 10}, {n}]; yoi = RandomReal[{-10, 10}, {n}]; ri = RandomReal[{0, 10}, {n}]; ----------------------------------- (* ... 14 Mar 2010 06:32

Trouble with coupled quadratic equations where the solutions are
If you're willing to accept numeric solutions then try solving for the distances instead of the coordinates. If dd is the matrix of squared distances, and h = IdentityMatrix[n]-1/n, then -.5(h.dd.h) should have 3 positive and n-3 approximate-zero eigenvalues. Sort the eigenvalues, drop the last 3, minimize the sum ... 13 Mar 2010 08:37

QuickFactorInteger
Dear Mathematica Gurus Who know how write procedure which will be do brutal force stop FactorInteger after defined time (e.g. 30 second) but results finded up to 30 second should be listed Best wishes Artur Option Automatic need about 75 second to stop Timing[fax = FactorInteger[ 1111111111111111111... 19 Mar 2010 03:48

Exporting equations as high-quality graphics
Hi, I have some equations that I would like to export as high quality vector graphics to include in a poster which I am making in InDesign. I am exporting them as EPS. I also tried comparing it with the eps export from latexit. The latexit seems to look a lot better, even when I mess with the EPS options in m... 13 Mar 2010 08:37

Plot not working correctly
Hello, I'm having a problem with plotting and I'm not sure what the cause of it is. What is going on??? Here is what I'm doing: (*A simple system of ODEs*) dS[t_]:= -b/P*S[t]*Inf[t] dInf[t_]:=b/P*S[t]*Inf[t]-g*Inf[t] dR[t_]:=g*Inf[t] (*A function to solve the system and return the value of R[100000]*) ... 15 Mar 2010 06:47

keyboard short cut for equal symbol aligned math cell
Is there a keyboard shortcut to add an equal symbol aligned math cell (or a marker aligned or centered math cell) to a notebook. I can only find it in the writing assistant pallette I couldn't find anything relevant in teh documentation center thanks for the help Chris ... 12 Mar 2010 08:18

log axis in ListPointPlot3D
Hi, I have frequency,voltage, and epsilon data as three columns. I need to plot this in 3d plot so that frequency in log scale. looking forward... Thanks.. ... 12 Mar 2010 08:18

windows 64 vs 32 bit
I am not sure if this is the right place to ask this, but I can't think of any better. Would I gain some performance with Mathematica if I installed 64bit windows 7? I have a quad-processor, but only 2 gb ram, so I am not sure. Thanks. ... 16 Mar 2010 06:50

Symbolize, subscripted variables, and annoying TraditionalForm
Hello, After loading the Notation package and enabling subscripted variables with Symbolize[Subscript[a_,b_]], they display normally in StandardForm. However, I'd like them to also display normally in TraditionalForm, instead of displaying a_Subscript_b (where the underscore is actually an underbracket). I t... 12 Mar 2010 08:18

Manipulate [ Show [graphics ]]]
Dear Experts, I am plotting some frequencies and a function in a 3D graph. Each frequency is a real number between [0,1], so I am plotting these in a tetrahedron where the frequency is measured along the sides of the unit tetrahedron. The basic tetrahedral axes and transformations are encoded as follows: ... 16 Mar 2010 05:45