Google Groups Home
Help | Sign in
comp . soft-sys . math . mathematica
This is a Usenet group - learn more
Find or start a Google Group about mathematica.
Group info
Subscribers: 1757
Activity: Medium activity
Language: English
Group categories:
Computers
More group info »
Active older topics
Related Groups
Maple computer mathematics discussion group.
Low activity, Usenet
Symbolic algebra discussion.
Low activity, Usenet
Numerical Analysis.
Medium activity, Usenet
Discussions
View:  Topic list, Topic summary Topics 1 - 10 of 33585  Older »
Description: Mathematica discussion group. (Moderated)
 

3D plot with orthographic projection 
  Hi, I would like to create a 3D Plot in Mathematica 7 using an orthographic projection instead of the default stereographic mode. So far, I have found that it is possible to give something like "ViewPoint->{0,0,Infinity}" as an option in order to view at the plot from the top plane, using orthographic projection. But the ViewPoint... more »
By markus  - 5:36am - 1 new of 1 message    

Union slowdown when SameTest is specified 
  Hello group! I was a little surprised and puzzled by the following: In[1]:= $Version Out[1]= "7.0 for Mac OS X PowerPC (32-bit) (November 10, 2008)" In[2]:= data = RandomInteger[{1, 10}, {5000, 2, 12}]; Timing[Union[data];] Out[3]= {0.008138, Null} So far so good; so far so speedy. But why does this happen:... more »
By J Siehler  - 5:36am - 1 new of 1 message    

NDSolve to solve a set of "loop" equations 
  Hi, there. I am new to mathematica and recently I am intrigued by the convenience of NDSolve function, since there is no need to write the Runge-kutta like functions myself to solve ODEs. However, if what I want to solve is a list of equations expressed in a loop way, I have no idea how to express it.... more »
By Haibo Min  - Jul 2 - 2 new of 2 messages    

Polynomial rewriting question 
  Consider the following polynomials: Here x,y,z,w,h are variables; rest are constants. (1) x*z-y*z, (2) x^2*w -2*x*y*w +y^2w + p, (3) 2*s+h+x-y When we look closely at these, we notice that everywhere x and y occur, they occur as "x-y". Suppose we let t= x-y, then we can rewrite the above polynomials as (1) tz (2) t^2*w (3) 2*s+h+t.... more »
By AndrewTamra  - Jul 2 - 1 new of 1 message    

Problem with nested StringReplace[] 
  I am trying to match a substring using a regular expression, and right away apply some replacement rules to that substring. Suppose I want to match a substring "bar" and right away replace it using the rule {"bar" -> "baz"}. The following doesn't work: expected: "baz", actual: "bar" StringReplace[... more »
By dnquark  - Jul 2 - 1 new of 1 message    

Ability to match balanced parentheses using string patterns / regular 
  I am curious, does Mathematica have the capability to match strings involving balanced parentheses? In particular, would it be possible to translate the following Perl code into Mathematica? ...my $bal; $bal = qr /[(] # match opening paren [^()]* # match stuff that doesn't involve... more »
By dnquark  - Jul 2 - 1 new of 1 message    

FullForm of Plot? 
  I know this is kind of a technical question, but I'd like to have a clearer understanding of this if someone is willing to help. A Plot expression Plot[f,List[x,xmin,xmax]] itself appears to be in FullForm. Yet, its FullForm is actually a Graphics expression. I understand that all graphics in Mathematica have the FullForm head Graphics (or... more »
By dsmithy  - Jul 2 - 1 new of 1 message    

Precision problem in analytic expression 
  Dear all, I have a problem with some analytic expressions. I want to plot them for different parameters. However, for a certain range of parameters some terms in the expressions get really large. Although these terms cancel out in the end, numerical precision seems to be too small resulting in some differences to the expected result: where it should be (almost)... more »
By Wieland Brendel  - Jul 2 - 1 new of 1 message    

DynamicModule Timeout 
  Does anyone know if DynamicModule has a timeout for the Initialization option, and if so what is it? I have a DynamicModule that first needs to load a large amount of data from disk before displaying, and I'm using the Initialization option in DynamicModule to do this. However, it's not working, as after a little while I get a messed up dynamic expression in the... more »
By Mohammed AlQuraishi  - Jul 2 - 1 new of 1 message    

Bugs in FullGraphics and AbsoluteOptions and temporary workaround 
  Hello, There is one major bug in FullGraphics (as well as in Absolute Options): FullGraphics uses PlotRange from the AbsoluteOptions and fully ignores PlotRangePadding (new in Mathematica version 6) and AxesOrigin (new in 2) options. This is the reason for clipping the X-axis that we see here: g = Plot[Sin[x], {x, 0.2, 10}]... more »
By Alexey  - Jul 2 - 2 new of 2 messages    

1 - 10 of 33585   « Newer | Older »

XML      
Create a group - Google Groups - Google Home - Terms of Service - Privacy Policy
©2009 Google