NumPy-Discussion October 2008

numpy-discussion@python.org

144 participants
145 discussions

will array(Python set) be ever implemented as cast method?
by dmitrey 01 Oct '08

01 Oct '08

hi all, will array(Python set) (and asarray, asfarray etc) ever be implemented as cast method? Now it just puts the set into 1st element: >>> asarray(set([11, 12, 13, 14])) array(set([11, 12, 13, 14]), dtype=object) >>> array(set([11, 12, 13, 14])) array(set([11, 12, 13, 14]), dtype=object) Currently I use array(list(my_set)) instead. D.

2 1

why type(array(1).tolist()) is int?
by dmitrey 01 Oct '08

01 Oct '08

hi all, why array(1).tolist() returns 1? I expected to get [1] instead. D.

3 4

xml-rpc with numpy arrays
by Brian Blais 01 Oct '08

01 Oct '08

Hello, I am trying to use xml-rpc to be able to run some simulations remotely. I am running into a problem with the transfer of numpy arrays. my server code looks like: #!/usr/bin/env python def again(x): # test out the sending of data return [x,x] from SimpleXMLRPCServer import SimpleXMLRPCServer SimpleXMLRPCServer.allow_reuse_address = 1 server = SimpleXMLRPCServer(("", 8000)) server.register_function(again) try: print "Serving..." server.serve_forever() # Start the server finally: print "done." server.server_close() my client code looks like: import numpy from xmlrpclib import ServerProxy server=ServerProxy('http://localhost:8000') server.again(5) # this works b=numpy.random.rand(5,5) server.again(b) # this gives an error this gives the error: <type 'exceptions.TypeError'>: cannot marshal <type 'numpy.ndarray'> objects which seems to be a deficiency of the marshal library, or perhaps I am doing something wrong. Is there a way to fix this? Is there another approach that I should be using? thanks, Brian Blais -- Brian Blais bblais(a)bryant.edu http://web.bryant.edu/~bblais

6 10

Upper and lower envelopes
by bevan 30 Sep '08

30 Sep '08

Hello, I have some XY data. I would like to generate the equations for an upper and lower envelope that excludes a percentage of the data points. I would like to define the slope of the envelope line (say 3) and then have my code find the intercept that fits my requirements (say 5% of data below the lower envelope). This would then give me the equation and I could plot the upper and lower envelopes. I hope this makes sense. Thanks for any help.

4 4

Fwd: [sage-devel] Sage Days 11: November 7-10, Austin, Texas
by Fernando Perez 30 Sep '08

30 Sep '08

Hi all, I think the original announcement only went to the Sage lists, but this should be of interest to this crowd as well. Cheers, f ---------- Forwarded message ---------- From: Craig Citro <craigcitro(a)gmail.com> Date: Sun, Sep 21, 2008 at 8:47 PM Subject: [sage-devel] Sage Days 11: November 7-10, Austin, Texas To: sage-devel(a)googlegroups.com, sage-support(a)googlegroups.com Hi all, This is a reminder that Sage Days 11 is fast approaching! The topic is "Special functions and computational number theory meet scientific computing." The plan is to bring together a bunch of number theorists and scientific computing/supercomputing experts, and Austin's incredible supercomputing facilities make this the perfect place for it. If you're new to Sage, and interested in this topic, attending a Sage Days is the perfect way to get more involved. (For those of you who've been around a while, you know the drill -- just go ahead and skip this paragraph.) Sage Days are friendly and very intensive focused development workshops, which are probably fairly different from other math-related conferences and workshops you've attended. There are usually only one to two talks per day, in order to allow for the maximum time for working discussions and coding sprints. The groups are organized on the first day, and there are regular progress reports throughout the workshop. We have a webpage: http://www.math.utexas.edu/sage and a wiki page: http://wiki.sagemath.org/days11 If you're planning on joining us in Austin, please register soon at http://www.ma.utexas.edu/sage/rform1.php, and add your name to the wiki. We do have some limited funding available, so please let us know if you'll need funding. We have a block of rooms reserved at the Doubletree Guest Suites in Austin, and we'll let you know more details on that soon. If you have any questions, feel free to email me or any of the other organizers! On behalf of the organizing committee, -Craig Citro

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NumPy-Discussion October 2008