Mathematica
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ContourStyle Question Hi All I'd like to plot contour lines consisting of a solid line with short diagonal lines on one side, something like this -------------------- <---(solid line along the contour) ///////////////// <---(short diagonal lines on one side) I'm making a plot of experimental data and I want to show that the regi... 25 Jun 2010 08:47
precedence for ReplaceAll? I am having trouble using ReplaceAll to replace symbols that already have a delayed assignment. e.g., this input: In[287]:= a := A c b := B c a /. {a -> x, b -> y} b /. {a -> x, b -> y} a + b /. {a -> x, b -> y} a * b /. {a -> x, b -> y} gives this output: Out[289]= x Out[290]= y Out[291]= x + ... 10 Jul 2010 04:07
Export 3D graphics to Web page (a la LiveGraphics3D) Hello, A few years ago I was using Martin Kraus's LiveGraphics3D application ( http://www.vis.uni-stuttgart.de/~kraus/LiveGraphics3D/ ) to export 3D graphics from Mathematica to Web pages. This allowed people to rotate, spin, zoom etc in their browsers. However the Web page says that "only versions of Mathemati... 24 Jun 2010 05:17
Lists: Row Vectors vs. Column Vectors. (feels Why stop at a special kind of Matrix object? Why not a 3D array? a 4D array? or higher-dimensional? The root of the matter is that Mathematica simply does not have a general concept of an array of any number of dimensions, with automatic, corresponding display for the various dimensions. This is unlike AP... 23 Jun 2010 02:59
calculating mean prediction bands I have a 3 dimensional grid of data points that I am fitting to a 2 dimensional (second order) polynomial model. I wanted to use the Levenburg-Marquardt method so I used the NonlinearModelFit function with the appropriate options selected. But what I am really interested in is the mean prediction bands associated with ... 23 Jun 2010 02:59
Newby Q: How to specify reals Trying the following procedure: In[41]:= {T1, T2, C1, C2, R1, R2, w} \[Element] Reals Out[41]= (T1|T2|C1|C2|R1|R2|w)\[Element]\[DoubleStruckCapitalR] In[42]:= x = R1 + I 1/(w C1) Out[42]= R1+I/(C1 w) In[43]:= Im[x] Out[43]= Re(1/(C1 w))+Im(R1) Question is, how do I specify the list {T1,T2,...} such... 26 Jun 2010 09:43
SFTP Is there any way in Mathematic (using the syntax of ftp link, options on Import, or whatever) to access files stored remotely using SFTP, i.e. ftp with the SSH security protocol? Neither Import["ftp:// user: password @ host: port / path"] nor Import["sftp:// user: password @ host: port / path"] seems ... 30 Jun 2010 08:39
Floating point exception when taking a reciprocal Leo Alekseyev wrote: I am running into a strange bug where taking reciprocals of a list of floating point numbers crashes the kernel with a floating point exception. This is on a Linux x86_64 system, Ubuntu 9.10, running Mathematica 7.0.1.0 Something like foo=Array[1.0&,1000]; 1/foo or ... 22 Jun 2010 07:10
More about algebraic simplification In response to someone who objected to my statement that replacement rules are not adequate for what I want to do, I will state the problem more completely without getting into irrelevant details. I have n points in R3 in general position. Through all (n choose 3) sets of 3 points I construct a plane and a cir... 24 Jun 2010 05:17
Help me : Solve a simple PDE in Mathematica Dear all, I have a PDE in cylindrical coordinate but i cant imply the boundary condition : In the text book, i have this equation : eqn = D[u[r,z],{z,2}]+D[u[r,z],{r,2}+D[u[r,z],{r,1}]*1/r == 0 b1 = ( D[u[r,z],{z,1}]/.z->0 ) ==0 b2 = ( D[u[r,z],{r,1}]/.r->10^-5 ) ==0 b3= u[r,2]==1 b4 =u[2,z] ==1 NDSolv... 23 Jun 2010 02:59 |