Mathematica

Mathematica and LaTeX
Hi all In Mathematica I have the following code: Export["plot.pdf", Plot[x^2, {x, 1, 2}], ImageSize -> 100] Now, when I include "plot.pdf" in my LaTeX-document, my compiler says that there is no bounding-box, and hence it will not compile. What is the issue here? Mathematica or LaTeX? Also, is it possible t... 8 Mar 2010 06:23

What inspite FindInstance ?
Dear Mathematica Gurus, Mathematical problem is following: Find rational numbers a,b,c such that (Pi^2)*a+b+c*Catalan==Zeta[2,5/k] for some k e.g. FindInstance[ Zeta[2, 5/4] -a Pi^2 - b - c Catalan == 0, {a, b, c}, Rationals] give answer FindInstance::nsmet: The methods available to FindInstance are insuff... 5 Mar 2010 05:02

ListContourPlot3D - only working with arrays?
Hi I have data in the form {{x1,y1,z1,f1},{x2,y2,z2,f2},...} and want to make a 3D contourplot. But why does this not work ?? : ListContourPlot3D[{{1, 1, 1, 3}, {1, 1, 2, 4}, {1, 1, 3, 5}, {1, 2, 1, 4}, {1, 2, 2, 5}, {1, 2, 3, 6}, {1, 3, 1, 5}, {1, 3, 2, 6}, {1, 3, 3, 7}, {2, 1, 1, 4}, {2, 1, 2, 5}, ... 4 Mar 2010 06:41

Developing C code with Workbench
I would like to use Workbench for writing C code as well as for Mathematica, but I have no clue how to set it up. Has anyone out there done this? ... 4 Mar 2010 05:35

(is there) anyway to tell that Dynamic is running?
Hello mathGroup: I am trying to understand Dynamic[] better by customizing some of the examples in the VirtualBook chapter about this. Specifically, I read that Dynamic[] runs in the front-end. Sometimes (partcularly when I have a bug,) the system appears to be hung. When I run a regular command, it shows "Run... 4 Mar 2010 05:34

Problem with Simplify and Integrating a gaussian
Hello, I encountered a very strange behaviour of Mathematica and would like to ask if this is a bug or if I am doing something incredible wrong. I hope this list is the right place to do so. Please find below the contents of my notebook: In[27]:= v[x_]=If[x<a,0,Exp[- ((x-a)/1.)^2]] u[x_]=Simplify[v[x]] Out... 3 Mar 2010 06:14

Select Maximum Value
Hi I want to pick up the maximum value of each list in the Array A={{2, 4, 1, 3, 2, 2}, {4,7,9,1,2,4}} I can do it in two steps.. B=Table[Sort[A[[i]], #1>#2&], {i, 1, Length[A]}]; C=Table[B[i], {i, 1, Length[B]}]; But is there any way I can do it in just one step with Select function or any thing el... 5 Mar 2010 05:02

Annoying error in Hypergeometric2F1
This is very bad and disappointing...what about version 7 .. Looks like the symbolic evaluation is messed up.. Mathematica 6.0 for Linux x86 (32-bit) Copyright 1988-2008 Wolfram Research, Inc. In[1]:= Hypergeometric2F1[1/2, 2, 3/2, -125/100] Sqrt[5] 10 + 9 Sqrt[5] ... 3 Mar 2010 06:14

Harmonic Numbers
Sum[k/((k^2 + 1) (k^2 + 4)), {k, 1, \[Infinity]}] Sum does not converge. NSum[k/((k^2 + 1) (k^2 + 4)), {k, 1, \[Infinity]}] 0.206647 Fortunately I know how to do this sum by hand, but Mathematica can usually handle these Harmonic number functions pretty well. Does anyone know a way of massaging this i... 3 Mar 2010 06:14

Modification of Variable in NDSolve
I need to modify a variable while a system of ODE's are being solved. I've simplified the problem to the following: dA = B[t]; dB = (1 - A[t]^2) B[t] - A[t]; dF = B[t] + 0.2; Module[{count = 0, last = 0.}, sol = NDSolve[{A'[t] == dA, B'[t] == dB, F'[t] == dF, A[0] == 1, B[0] == 1, F[0] == 1}, {A, B, F},... 8 Mar 2010 06:23