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Groups > comp.lang.python > #77877

Re: CSV methodology

From Peter Otten <__peter__@web.de>
Subject Re: CSV methodology
Date 2014-09-15 09:29 +0200
Organization None
References <b2q91ada6b59ept81ac65vtnnu6sdklp1h@4ax.com> <mailman.14005.1410678164.18130.python-list@python.org> <i5db1a9s5mvgsmg99q8kqf4l672fbrvp0n@4ax.com>
Newsgroups comp.lang.python
Message-ID <mailman.14017.1410766159.18130.python-list@python.org> (permalink)

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jayte wrote:

> Sorry, I neglected to mention the values' significance.  The MXP program
> uses the "distance estimate" algorithm in its fractal data generation. 
> The values are thus, for each point in a 1778 x 1000 image:
> 
> Distance,   (an extended double)
> Iterations,  (a 16 bit int)
> zc_x,        (a 16 bit int)
> zc_y         (a 16 bit int)
> 

Probably a bit too early in your "Python career", but you can read raw data 
with numpy. Something like

with open(filename, "rb") as f:
    a = numpy.fromfile(f, dtype=[
        ("distance", "f16"),
        ("iterations", "i2"), 
        ("zc_x", "i2"),
        ("zc_y", "i2"),
    ]).reshape(1778, 1000)

might do, assuming "extended double" takes 16 bytes.

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Thread

CSV methodology jetrn@newsguy.com - 2014-09-13 21:34 -0400
  Re: CSV methodology kjs <bfb@riseup.net> - 2014-09-14 02:51 +0000
  Re: CSV methodology Terry Reedy <tjreedy@udel.edu> - 2014-09-14 03:02 -0400
    Re: CSV methodology jayte <jetrn@newsguy.com> - 2014-09-14 12:56 -0400
      Re: CSV methodology Chris Angelico <rosuav@gmail.com> - 2014-09-15 03:10 +1000
      Re: CSV methodology Terry Reedy <tjreedy@udel.edu> - 2014-09-14 14:42 -0400
        Re: CSV methodology jayte <jetrn@newsguy.com> - 2014-09-14 16:19 -0400
      Re: CSV methodology Peter Otten <__peter__@web.de> - 2014-09-15 09:29 +0200
        Re: CSV methodology jayte <jetrn@newsguy.com> - 2014-09-15 12:33 -0400
          Re: CSV methodology Peter Otten <__peter__@web.de> - 2014-09-16 13:22 +0200
            Re: CSV methodology jayte <jetrn@newsguy.com> - 2014-09-16 14:03 -0400
            Works perfectly (was Re: CSV methodology) jayte <jetrn@newsguy.com> - 2014-09-22 20:27 -0400
              Re: Works perfectly (was Re: CSV methodology) Peter Otten <__peter__@web.de> - 2014-09-23 09:59 +0200
  Re: CSV methodology Cameron Simpson <cs@zip.com.au> - 2014-09-14 18:38 +1000
    Re: CSV methodology Rustom Mody <rustompmody@gmail.com> - 2014-09-14 01:56 -0700
      Re: CSV methodology Cameron Simpson <cs@zip.com.au> - 2014-09-15 09:28 +1000
  Re: CSV methodology Akira Li <4kir4.1i@gmail.com> - 2014-09-15 11:12 +0400
    Re: CSV methodology pH <high@cidity.level> - 2014-09-15 12:40 -0400
  Re:CSV methodology Dave Angel <davea@davea.name> - 2014-09-15 09:29 -0400
    Re: CSV methodology jayte <jetrn@newsguy.com> - 2014-09-15 12:53 -0400

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