Mathematica

NDSolve cannot solve set of ODEs
Dear group, I have a set of ODequations (see below, the ordinary Chemoton modell), which when evaluated, returns the following error: NDSolve::ndnum: Encountered non-numerical value for a derivative at t == 0.`. >> Could you please pinpoint any mistake here? Thanks in advance.\ Istvan NDSolve[{ \!... 23 Apr 2010 20:53

Line changes length in animation
Hello, I have two problems with the attached code simulateing a chaotic pendulum. The first one seems easy: the replacement by sol doesn't seem to work and I cannot see why. Without the Module I got it working, but another strange problem: In the animation, the length of the pendulum changes, although that... 23 Apr 2010 17:33

How to make make a Dynamic variable to become an ordinary one
Dear Community, I have an interactive program, where I am using a Dynamic variable. In some point I would like to transform this variable to an ordinary one (e.g. I would like that the variable does not change dynamically any more). Such an operation can easily be done by Menu/Evaluation/Convert dynamic to l... 24 Apr 2010 05:01

Download as Live Mathematica from Wolfram|Alpha
Hi all, Last year a thread started on MathGroup concerning the use of "Download as Live Mathematica" from Wolfram|Alpha generated output. Has anyone found a way or ways to use this "Live Mathematica" output for examples and hints for generating custom versions of the Wolfram|Alpha output? I have tried unsucces... 24 Apr 2010 05:01

Unevaluated functions
Hello, In Mathematica when a function returns unevaluated the "return value" is the name of the function with arguments. How do we control such output? Can we suppress it? How do we change the usual string for something like "N/A"? Advise please. Alex ... 24 Apr 2010 05:01

Find (cyclic) Sequence
Dear Group: Consider the following sequence {0,3,2,1} which can be related to the reference k: {0,1,2,3} as 4-k (mod 4). I've tried to use FindSequenceFunction on problems like the example above without success. I understand I'm working within the context of modular arithmetic... Does anyone have a suggestion... 24 Apr 2010 05:01

How to run GUIKitApplication module as Standalone Java Application?
Hello, I found that it's easy to run GUIKitApplication module like this: java -cp "..." com.wolfram.guikit.app.GUIKitApplication "Wolfram/ Example/Calculator" But, how to set the location of the Mathematica (thru the parameters)? For example, for ordinary JLink application they are like following: java ... 23 Apr 2010 17:33

Lining up y axes and sizing plot areas
Use an ImagePadding option in both plots to leave the same amount of padding on the left to accommodate either set of tick values. This will mean there will be extra space for the integer y ticks, but that's what you need to do to make things line up. Column[ {Plot[2 Sin[x] + x, {x, 0, 15}, Filling -> Botto... 23 Apr 2010 17:33

Adding the elements of a list sequentially
I am looking for an efficient way to add the elements of a list sequentially onto another list For example, generate list c, given lists a and b: a = {1,2,3,4,5,6,7,8,9,10} b = {1,2} c = {2,4,4,5,6,7,8,9,10,11} another example: a = {1,1,1,1,1} b = {1,2,3} c = {2,3,4,2,3} It seems like there m... 23 Apr 2010 20:53

Header and Footer Number of Pages
Hi, how are you? I'd like to put x of y pages wheter in the header or footer of my Mathematica Notebook. I've been trying to find info on CounterBox and CellTags, but I couldn't make it work. Any help would be appreciated. Regards, Javier Arias ... 23 Apr 2010 20:53