Mathematica

ElementData[] Problems
Hi, whenever I try to use ElementData[], Mathematica keeps returning $Failed. Do I need to load a particular package before using it like I would with <<PhysicalConstants` ? Thanks for the help! Sean. ... 27 Jan 2010 02:40

Compile and Interpolating Functions
Hello, I have a question about Mathematica's Compile function. I'm curious to know if there is a trick or hidden way to Compile on a function that has a list of interpolating functions as an input, an output, or both. From what I've seen, the datatypes must be a Real, Integer, or Boolean. Any ways around this ... 25 Jan 2010 06:07

MatrixPlot: range of colors and plot legend?
Needs["PlotLegends`"] data = RandomReal[{0, 1}, {10, 10}]; ShowLegend[ MatrixPlot[data, ColorFunction -> (GrayLevel[1 - #] &), ColorFunctionScaling -> False], {GrayLevel, 10, "1", "0", LegendPosition -> {1.1, -0.4}}] xmin = Min[data]; xmax = Max[data]; ShowLegend[ MatrixPlot[data, Color... 25 Jan 2010 06:07

MatrixPlot: range of colors and plot legend?
Hello All, I'm having a little bit of trouble with MatrixPlot: 1) It looks to me like the default color set goes from a pale, sandy orange to a dark orange. Well, it would be more correct to say that my wife told me that the default color set goes from a pale, sandy orange to a dark orange, since I'm essenti... 26 Jan 2010 07:37

problem with inverse laplace transform
I'm trying to calculate the response of a simple low pass RC-filter with time constant tau=33us to a square wave with amplitude 3V: hs=1/(1+tau*s) hps=1(1-Exp[-tee*s]) ; this is necessary to make it periodic with period tee tau=33.0*^-6 tee=330.0*^-6 ui1s=3/s ui2s=-6/s*Exp[-tee/2*s] uis=(ui1s+ui2s)*hps uos=ui... 24 Jan 2010 06:47

DynamicModule not saving reliably a variable between sessions
Hello, I have a rather complex dynamic notebook GUI with several TabView, Button, InputField and other objects that does not save reliably a variable "jobs" between Mathematica sessions. The basic structure of the GUI is a follows: DynamicModule[{jobs = {}, ...}, ..., TabView[{..., "Edit jobs" -> Dynamic[j... 23 Jan 2010 07:39

The formula of Abraham Moivre
How by means of Mathematica to transform (Cos [x] +I* Sin [x]) ^n in Cos [n*x] +I*Sin [n*x]? Thanks. ... 25 Jan 2010 06:07

Using "If" and "NDSolve" together
Hello! I have a tricky job to do: I want to simulate something, and want to assign a value to a variable under certain conditions. Those are, if time is within a certain interval, I want that variable to have that value. Otherwise, I want it to have other value. Until now, I have been trying to use the followi... 4 Feb 2010 06:39

Creating new ColorFunction / ColorDataFunction
Dear all, I'm putting together a package to automate some of the specific time series and bar chart styles used by my employer. Ultimately I hope to be able to set it up as a palette/package combination to provide a GUI that can used in Player Pro. There are many things I am still struggling with. One of the... 27 Jan 2010 02:40

How to calculate covariant derivative by Mathematica?
I need to calculate covariant derivative by Mathematica. I noticed that there is no such a function in Mathematica. Can we define such a funcation? I don't know how to do it. Who can tell me how to define and calculate covariant derivative with Mathematica? ... 24 Jan 2010 06:47