Mathematica
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Norm Hi, I want to calculate a distance matrix, similar to (as poorly explained at) http://en.wikipedia.org/wiki/Distance_matrix I found out about the Function "Norm" in mathematica 5. Here is a little example. I want to calculate the distance between vectors {0,1} and {5,1}. The distance should be 5 Now, Nor... 21 Jul 2006 06:50
Using NDSolve in Mathematica Hi, I am trying to solve for a system of 16 coupled differential equations for a density matrix problem. One of my initial conditions are that x13[t]+x14[t]+x15[t]+x16[t]==1 - I do not know how to incorporate this in the system of equations as a boundary condition. I get the error message NDSolve::ndode: ... 4 Jul 2006 11:43
Determining continuity of regions/curves from inequalities Is there an easy way in Mathematica to determine whether the region or curve formed by a system of inequalities is continuous or not? For example, the output of some function (e.g. Reduce) might be as follows: x>2 && y>0 which forms a continuous region. Again, the following output (x<2 && y<0) || (x>2 && ... 20 Jun 2006 02:41
piecewise integration The Integrate result seems pretty weak. Is there any way to obtain a more explicit exact answer besides manually converting the Piecewise function to two UnitStep functions? Can the same be done if the final limit of integration is a variable? in load[x_]=-9*10^3*DiracDelta[x]+Piecewise[{{x*10*(10^3/3),0<=x<=3... 8 Jun 2006 05:45
Plotting independent quantities I am trying to plot the velocity and acceleration of a particle as a function of time on the same plot. I need two y axes for this purpose (each with their units, etc.). Is such a plot possible in Mathematica ? ... 31 Mar 2006 06:46
3D voronoi problem in mathematica Hi! Can mathematica or qhull deal with 3D voronoi tesselation under periodic boundary condition? For example, there are 1000 points in a cube, and I want to add periodic boundary condition to all three direction. Any help is appreciated! ... 6 Mar 2006 05:36
pictures of mathematics on a non-white background Dear Mathgroup, If one with exports something like: StyleForm[TraditionalForm[1+E], FontColor->White,Background->Black] as a raster format, there is a white border around the math. I thought it might be the output cell background color, so I changed the stylesheet to Natural Color. Exporting the expression sti... 14 Mar 2006 06:28
Limit i want to find the value of the limit 1+(2/(3+(4/(5+(6/(7+... how can i do that with Mathematica? Tnx.. ... 2 Mar 2006 19:43
Mathlink Hello: I have a question regarding MathLink. The basic idea is to be able to access a function written in C via Mathematica. I followed the procedure illustrated in the Mathematica Book. I wrote a template file for the function and used mprep to generate corresponding .c file. However, when I compile this .c fil... 10 Feb 2006 02:39 |