Mathematica

axes with arrows with ParametricPlot3D
How to get arrows on the ends of axes in ParametricPlot3D ? I try some combinations of options and directives without success. From other side how to combine Graphics3D with Arrows and ParametricPlot3D to have the same result: 3D surface and axes with arrows in 3D ? ... 23 Apr 2010 20:53

Bug in Mathematica 7.0.1.0 ?
In[1] := Im[a] ^= 0; Conjugate[a b] Out[1] := Conjugate[a b] It is not funny, Mathematica 6 properly evaluates the result a Conjugate[b] What happens? slawek ... 23 Apr 2010 20:53

Lining up y axes and sizing plot areas
Hi everybody! I have two ListLinePlots of different time series analysis. They each have the same number of data points along the x axis. I want to show them one above the other, but have their respective time scales line up properly, e.g., the first data points lining up and the last data points lining up. ... 23 Apr 2010 20:53

MorphologicalPerimeter algorithm question
Hi, Can somebody from Wolfram point me out what algorithm has been used in MorphologicalPerimeter i.e which research paper has been used as the reference to construct this function and if there is any open source implementation of the MorphologicalPerimeter function? Thanks ... 23 Apr 2010 20:53

axes with arrows with ParametricPlot3D
On Apr 21, 4:29 pm, kokos <artb...(a)interia.pl> wrote: How to get arrows on the ends of axes in ParametricPlot3D ? I try some combinations of options and directives without success. From other side how to combine Graphics3D with Arrows and ParametricPlot3D to have the same result: 3D surface and axes with... 23 Apr 2010 20:53

GUIKit runtime error occurred :java.lang.NullPointerException
Hello, I have a module which uses GUIKit to build some user interface in Mathematica. It works OK from Mathematica frontend but it does not work in batch mode: "f:/program files/wolfram research/mathematica/7.0/math.exe" -initfile ".../path/gui-module.m" -noprompt Get out the exception: GUIRun::err: T... 24 Apr 2010 05:01

Experimental`NumericalFunction::dimsl
Hello all, I'm stumped with an error code I'm getting from FindMinimum after it runs for over 7 minutes. Its, <snip> Experimental`NumericalFunction::dimsl: {-0.8} given in -0.8 should be a list of dimensions for a particular argument. FindMinimum::dimsl: {-0.8} given in -0.7999999999999636` should be a list... 24 Apr 2010 05:01

finding equations
is there a program that helps to identify equations in documents? for example, a search engine that would search for "homogeneous linear equation" and return any document that contained something like that; i.e., a*b=0 3x+6y=0 this way we don't have to know which variable signs are chosen... ... 23 Apr 2010 20:53

problems with NMinimize
Hi, I am trying to use NMinimize to find the solutions to various numerical equations and I keep getting error messages concerning non-numerical values. For example consider the following: In[2]:= NMinimize[Abs[NIntegrate[Sin[x], {x, -a, b}]]^2, {a, b}] During evaluation of In[2]:= NIntegrate::nlim: x = -1. a i... 27 Apr 2010 08:44

Imposing constraints on a system of equations
A very simple question on imposing conditions/constraints. I know that a, r, and h must be real and non-negative in the following system of equations: eq1=Pi*r^2+2*Pi*r*x==0; eq2=2*Pi*r*h+(2*Pi*h+4*Pi*r)*x==0; eq3=2*Pi*r^2+2*Pi*r*h-a==0; sols=Solve[{eq1,eq2,eq3},{r,h,x}] How can I impose conditions on thi... 24 Apr 2010 05:01