Mathematica
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V. 6.0: PNG export problems Dear Colleagues, is there still someone who remembers some PNG export problems under version 6.0 run on Windows systems? The following example does not write a file, even though the message suggests some action (export as TIFF works, btw.): In[1]:= Export["c:/test.png", Import["ExampleData/spikey2.png"]] O... 22 May 2010 00:53
data in absolutetime Dear MathGroup, I have list of date for example: c={20100520,20100519,20100512,20100516,20100430,200100425,20100411,20100407} in this format. I need get from this list a new list with the same date but in absolutetime When I use AbsoluteTime["20100520"], I get this, but I don't know how can I use it for w... 22 May 2010 23:37
enter specific symbols for ListPlot usage I guess this is fairly simple to answer, but I've almost thrown the keyboard against the wall after struggling with it - so bear with me... I need to produce an article-quality plot of some sets of data, so I prefer to choose the color/symbols used. Therefore, instead of the usual PlotMarkers -> Automatic, I t... 25 May 2010 06:56
How to register a custom format with Import/Export Hi, I wrote some mathlink code to import EXR and NEF files into Mathematica. In previous versions (http://library.wolfram.com/ infocenter/Conferences/4937/) there was a function RegisterConverter in Experimental that allowed a custom format to be registered and deployed by Import/Export. I don't find this funct... 21 May 2010 07:17
data in absolutetime Dear MathGroup, I have list of date for example: c={20100520,20100519,20100512,20100516,20100430,200100425,20100411,20100407} in this format. I need get from this list a new list with the same date but in absolutetime When I use AbsoluteTime["20100520"], I get this, but I don't know how can I use it for whole... 21 May 2010 07:17
Changing image from grey-scale to another How would one convert a grey scale image into another color scale? By "another color-scale" I mean rather than rendered in shades of grey, rendered in shades of a different color. Many thanks, Jason In case you were wondering why I am asking: I am attempting to use Mathematica to analyse microarray dat... 22 May 2010 00:53
Numerical solution of differential equation with boundary susy wrote: Hallo, I need to solve the following differential equation: (1/4 r^2 + 2 Sin[F[r]]^2) F''[r] + 1/2 r F'[r] + Sin[2 F[r]] (F'[r])^2 - 1/4 Sin[2 F[r]] - (Sin[F[r]]^2 Sin[2 F[r]])/r^2 == 0 with boundary values: F[0]==Pi, F[Infinity]==0. I tried NDSolve, but failed to get... 21 May 2010 07:17
Numerical solution of differential equation with boundary It does not work for bc F[10^-5] == Pi Having searched using google for some time, I found a solution as follows: \[Epsilon] = 10^-10; fSky[sl_?NumericQ] := NDSolve[{(1/4 r^2 + 2 Sin[F[r]]^2) F''[r] + 1/2 r F'[r] + Sin[2 F[r]] ( F'[r])^2 - 1/4 Sin[2 F[r]] - 1/(r)^2 Sin[F[r]]^2 Sin[2 F[r]] == 0, F[\[Epsil... 21 May 2010 07:17
diagonal Ramsey number R(n,n)= 4k+2, R(5,5)=46 In my opinion, the red-blue critical graph (R(n,n)-1 nodes) for diagonal Ramsey number R(n,n)=r have two self-symmetry below: 1. It exists at least one node that the number of its red edges is same as blue, equal to (r-2)/2, so r-2 is even; 2. In the critical graph, the number of all red edges is as many as blu... 20 May 2010 07:16
Fluid dynamic over a complex terrain I am interesting in modeling the flow of air or water over a terrain with varying elevation. (the resolution is either 128x128 or 256x256). I have a few known values of the speed in some of the cells, and I am interested in extrapolating a solution that takes the terrain into account. For the wind, I assume a lay... 2 Jun 2010 02:14 |