Mathematica

3D interpolating
Hi all, I am trying to fit a series of 3D points, say data = {{{0, 0}, 0}, {{1, 1}, 1}, {{2, 2}, 2}}; with f = Interpolation[data] which gives me the error Interpolation::indim: The coordinates do not lie on a structured \ tensor product grid. I think that I got the data format wrong, but I can't ... 14 Apr 2010 05:29

List Manipulation: Conditionally changing y value when x value
On 09.04.2010 09:31, Charles Koehler wrote: Hello, If possible I could use a little help on this. I have a list of x and y data and based on the value of x I would like to manipulate the value y. I joined the data using: pts=MapThread[{##1}&,{x,y}] I assumed that by test... 12 Apr 2010 23:39

norm Function with FindRoot
dear All, i m trying to solve a system of nonlinear equations using FindRoot, but it is not terminating even though the iterations is exceeded and norm converged? is it possible bug? what normfunction does the findroot uses to solve system of nonlinear equations?? Is it possible to change that function? ... 12 Apr 2010 06:59

Left & Right Axes Different Scale?
Does anyone know how to render a Plot (or ListPlot or DateListPlot) with a different scale on the left and the right axes ? ... 13 Apr 2010 22:55

SparseArray
Hi, I would like to use SparseArray for large matrices and would like to use members of a list when giving values to the entries.Here is a simple example: l=={1}; SparseArray[{i_,i_}-> l[[i]],{1,1}] Part::pspec: Part specification i is neither an integer nor a list of integers. SparseArray[< 1 >,{1,1}] In fact ... 12 Apr 2010 23:39

Converting the integral of a sum into a sum of integrals
If I ask Mathematica to perform an indefinite integrate on a symbolic summation (with terms of the form a_i x^i), Integrate[Sum[Times[Power[x,i],Subscript[a,i]],{i,0,k}], it does nothing. If I try to tell it that summation and integration commute by applying the rule: Integrate[Sum[term_,range_],variable_]-... 13 Apr 2010 22:55

beginner question about syntax
Hi, I'm a fairly seasoned user of another system who's just started using Mathematica. Although at the moment I'm just playing around with Mathematica (without any specific task at hand), trying to figure out the Mathematica way of doing things from the documentation (particularly the examples) there are some th... 13 Apr 2010 22:54

ArrayPlot with inverted ColorFunction depending on MaxPlotPoints
Why does this work this way? lolo = - Table[i j, {i, 1, 7}, {j, 1, 128}] (* is negative *) ArrayPlot[lolo, ColorFunction -> "TemperatureMap", AspectRatio -> 1/ GoldenRatio, MaxPlotPoints -> 128] shows with the colors right (and higher MaxPlotPoints too), but ArrayPlot[lolo, ColorFunction -> "TemperatureMap", As... 12 Apr 2010 06:59

Support for PlotLegend in DateListPlot
Does anyone know if there any undocumented PlotLegend type functions that work in a DateListPlot? Using ShowLegend is too much work. ... 12 Apr 2010 23:39

Retrieving orphaned code
Hello, I seem to have accidentally 'orphaned' three functions i built . That is, the code is still active in memory, and the function name shows in black and displays its intended data ; however, the file's copies of the functions' source-code have been modified and recompiled under different names, fo... 12 Apr 2010 06:59