Mathematica

Journals dying?, apparently rather slowly (was
Dear Community, concerning this discussion on ways to make Mathematica publishing spread wider, I wonder if the webMathematica may do the job? Can one create a self-standing interactive html document with this, or webMathematica must necessarily stand on the server were this html document is placed? Bes... 2 Feb 2010 15:15

Numerical Problem
I expect I'm missing something in the documentation, but I can't see why this simple example of Euler's predictor-corrector applied to a stiff pair of equations should behave differently in Version 7 and Version 5. ======================================================================== $Version epcm[h_,y_List,f_L... 4 Feb 2010 07:45

ListLinePlot Labels
I'm trying to create a ListLinePlot with custom labels on the x-axis, i.e. "January, February..." instead of "1, 2..." The ChartLabels option doesn't seem to be compatible with ListLinePlot. Do you guys have any other suggestions, or possibly a way of hacking this with AxesLabel? ... 2 Feb 2010 15:15

Intervals. Was Re: More /.{I->-1} craziness. Schools are conservative.
Daniel Lichtblau wrote: ..... Let us further define two intervals to be equal whenever they have nonempty intersection. With these definitions, which I think are sensible, .. I disagree. The general meaning of a binary operation f on intervals A,B is f(A,B) = {f(a,b) | a in A and b in B}. ... 28 Jan 2010 03:08

distance to quadratic surface
I'm trying to find a distance from a point {xi,yi,zi} to a quadratic surface g(x,y,). (With the intent to use the least squares to actually determine the best quadratic surface later) dist2[x_, y_, z_] = (x - xi)^2 + (y - yi)^2 + (z - zi)^2; g[x_, y_] = c0 + c1 x + c2 y + c3 x y + c4 x^2 + c5 y^2; dx = D[dis... 2 Feb 2010 15:15

More /.{I->-1} craziness. Schools
0 and 1 are not "fuzzballs", so what interval could be >= 1 and also 0.? Bobby On Wed, 27 Jan 2010 00:44:22 -0600, Daniel Lichtblau <danl(a)wolfram.com> wrote: Richard Fateman wrote: [...] If all of Mathematica functionality were available in the free player version, WRI would need to drasticall... 3 Feb 2010 07:14

Ha! a document that FAILS because it is in notebook form!
In your Mathematica documentation reader, look for tutorial/WhyYouDoNotUsuallyNeedToKnowAboutInternals and scroll down to In[9] ... and notice that the example fails because it is in notebook form. :) I was inspired to write out a more detailed commentary on this document, which you can see at http:/... 28 Jan 2010 03:08

Access to Open Excel Cell
I know how to read Excel files into Mathematica. I am trying find a way to read data from a specific cell in an "open" excel spreadsheet. The basic problem is to make a change to a cell in excel, and then have a trigger in Mathematica kick off code to read that cell into Mathematica. I'm not too concerned on how... 2 Feb 2010 15:15

Can Mathematica interpolate non-uniform scatter data?
Hi all, Can Mathematica interpolate non-uniform scatter data? Like ListInterpolation or Interpolation functions... z = {{0.`, 0.`, 0.`, 0.`, 0.`, 0.`, 0.`, 0.`, 0.`}, {0.`, , 0.12467473338522769`, 0.18640329676226988`, 0.24740395925452294`, , 0.36627252908604757`, 0.42367625720393803`, 0.479425538... 13 Feb 2010 06:02

Sum and NSum problem
Mathrematica v7 1) Resulting function resturns k Sum[(x^k/k!)^k, {k, 1, Infinity}] -(x^k/(x^k - k!)) 2)NSum worses the approximation of zeta function eexp[x_, n_: 30] := 1 + Sum[(x)^k/k!, {k, 1, n}]; (*exponential function definition*) nzzeta[s_] := NSum[eexp[-s Log[k]], {k, 1, 60}]; nzzet... 26 Jan 2010 06:32