On Fri, Apr 11, 2008 at 4:30 AM, Nicoo <[EMAIL PROTECTED]> wrote: > > thx for theses examples, but now i don't found how to scale my plot, i > used list_plot
I'm not sure that you mean by scale but in any case, list_plot, and its options, is described here http://www.sagemath.org/doc/html/ref/module-sage.plot.plot.html#l2h-652 and show, and its options, is described here http://www.sagemath.org/doc/html/ref/module-sage.plot.plot.html#l2h-747 > > > On 10 avr, 18:38, Joshua Kantor <[EMAIL PROTECTED]> wrote: > > This should work for you > > > > sage: import numpy > > sage: a=numpy.loadtxt('my_file.txt') > > sage: x_vals=a[:,1] > > sage: y_vals=a[:,2] > > > > note that now x_vals and y_vals are numpy arrays. At this point you > > have a few ways of > > of doing the ftt > > > > Option 1 > > sage: from numpy import fft > > sage: fft.fft(x_xvals) > > sage: fft.fft(y_vals) > > > > Option 2 > > If you prefer sage vectors do it this way > > > > sage: import numpy > > sage: a=numpy.loadtxt('my_file.txt') > > sage: x_vals=vector(RDF,a[:,1]) > > sage: y_vals=vector(RDF,a[:,2]) > > sage: x_vals.fft() > > sage: y_vals.fft() > > > > If you are familiar with matlab, you should look at numpy and scipy > > (import numpy, import scipy). And you might find this > helpfulhttp://www.scipy.org/NumPy_for_Matlab_Users > > > > > > On Apr 10, 9:25 am, Nicoo <[EMAIL PROTECTED]> wrote: > > > > > simple txt file with columns > > > first column is the time, second the X velocity value, third the Y > > > velocity value > > > and I want to fft each components of velocity to get the frequency of > > > oscillations. > > > (sry for my bad english) > > > > > On 10 avr, 18:16, "William Stein" <[EMAIL PROTECTED]> wrote: > > > > > > On Thu, Apr 10, 2008 at 9:15 AM, Nicoo <[EMAIL PROTECTED]> wrote: > > > > > > > thx, I will try the fft() method, other question, how can I load my > > > > > datas in a vector ? > > > > > > What format are your datas in? > > > > > > -- William > > > > > > > On 10 avr, 17:40, "William Stein" <[EMAIL PROTECTED]> wrote: > > > > > > > > On Thu, Apr 10, 2008 at 8:26 AM, Nicoo <[EMAIL PROTECTED]> wrote: > > > > > > > Hello there, > > > > > > > -I used matlab to fft some datas, I have .m file from matlab, > is it > > > > > > > possible to load it in sagemath and use it ? > > > > > > > > No, the Sage programming language is Python, which is as > > > > > > different from Matlab's language as Mathematica is different > > > > > > than Matlab. > > > > > > > > Sage does have fft functionality itself though: > > > > > > > > sage: v = vector(RDF, 10000, range(10000)) > > > > > > sage: time w = v.fft() > > > > > > CPU time: 0.00 s, Wall time: 0.00 s > > > > > > > > It's also possible to use the Sage interfaces to Matlab/Octave... > > > > > > > > -- William > > > > > > -- > > > > William Stein > > > > Associate Professor of Mathematics > > > > University of Washingtonhttp://wstein.org > > > --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
