Mathematica

What's wrong with this assuming?
Hi, I have a situation where I have to simplify an expression that contains x and h, but x is given implicitly by h, so I can't explicitly eliminate it. So here's a simpler example that I'm trying and it does nothing: Assuming[x^2 + x == h, (x^2 + x)^2+h] // FullSimplify Is there a way to make this work?... 21 Jul 2010 08:02

Very very basic question about Mathematica expressions
Hi, I find that I don't understand a very basic thing about the building blocks of Mathematica. When the first command is s = x + h I figured that (string?) "s" represents (string?) "x+h". This theory pans out when one tries s^2 or D[s, x] or Integrate[s, {x, 0, h}] and s /. h -> 1... 24 Jul 2010 05:52

Animated Gif
With Mathematica 7 it is possible to import animated Gif. There is also a sample file one can experiment with. I loaded it and played an animation with ListAnimate or Animate. What is not clear to me is whether it is possible to play a loaded Anim. Gif. without using the kernel and without all the controls. Someth... 20 Jul 2010 03:45

Multiple packages in a single application
Dear MathGroupers, I'm developing an application containing multiple packages, using Wolfram Workbench. When I deploy it into my /Library/Mathematica/Applications folder (on Mac OS X), the packages refuse to load. Suppose I work for an organisation called XYZ and the packages are all inside a folder XYZ in the... 20 Jul 2010 03:45

A Question About Directive
I have noticed the use of Directive in some of the graphics examples from Bob Hanlon, David Park, and others. I am curious about this command, since it does not appear to do much that is new. For example, here is an example from the Help on Directive: Graphics[{Directive[Red, Thick], Circle[], Directive[Bl... 27 Jul 2010 05:09

Problems with Workbench Debugger Breakpoints
I have several packages for which the breakpoints do not seem to work in the Wolfram Workbench debugger. When I copy the content to a new package it works as expected. I don't have a lot of experience using the debugger, but I have played with it on and off for a few months, and haven't seen this issue before. ... 20 Jul 2010 04:50

Kolmogorov-Smirnov 2-sample test
Hello Everybody, I would like to perform a 2-sample k-s test. I've seen some posts on the archive about the one-sample goodness-of-fit version of the Kolgomorov-Smirnov test, but I'm interested in the 2-sample version. Here's a description of the method: http://en.wikipedia.org/wiki/Kolmogorov%E2%80%93Smirnov... 26 Jul 2010 09:25

A ODE I need to solve
Hi, Mathematica has a problem with this: DSolve[y''[x] + (2/Cosh[x - h]^2 - 1) y[x] == 0, y, x] although the solution is not too difficult. One of the solutions is 1/(Cosh[2(x-h)]+1)^(1/2) Is there a way to help Mathematica along? Thanks! ... 21 Jul 2010 08:02

Help Mathematica simplify this
Hi, For some reason Mathematica fails to do this: Assuming[ a Cosh[H/(2 a)] == 1, FullSimplify[ Cosh[H/a] + 1/2 ((H/a - H/a Cosh[H/a] + 2 Sinh[H/a]) Sinh[H/(2 a)] )/( H/(2 a) Sinh[H/(2 a)] - 1/a)]] The answer is actually 1 and I would think Mathematica could handle that. Is there a way to... 21 Jul 2010 08:02

Convert directed graph to undirected graph
What is the recommended way of doing this in Mathematica? -- Dr Jon Harrop, Flying Frog Consultancy Ltd. http://www.ffconsultancy.com ... 24 Jul 2010 05:52