Re: CSV methodology

Path	csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!newsfeed.xs4all.nl!newsfeed2a.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail
Return-Path	<python-python-list@m.gmane.org>
X-Original-To	python-list@python.org
Delivered-To	python-list@mail.python.org
X-Spam-Status	OK 0.001
X-Spam-Evidence	'H': 1.00; 'S': 0.00; 'algorithm': 0.04; 'assuming': 0.09; 'bytes,': 0.09; 'bytes.': 0.09; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'thus,': 0.09; 'assume': 0.14; '"extended': 0.16; '"python': 0.16; 'int)': 0.16; 'numpy': 0.16; 'received:80.91.229.3': 0.16; 'received:dip0.t-ipconnect.de': 0.16; 'received:plane.gmane.org': 0.16; 'received:t-ipconnect.de': 0.16; 'subject:CSV': 0.16; 'do,': 0.16; 'wrote:': 0.18; 'bit': 0.19; 'seems': 0.21; '>>>': 0.22; 'header:User-Agent:1': 0.23; 'sorry,': 0.24; 'mon,': 0.24; 'looks': 0.24; 'mention': 0.26; 'values': 0.27; 'header:X -Complaints-To:1': 0.27; 'point': 0.28; "doesn't": 0.30; 'sep': 0.31; 'raw': 0.33; "can't": 0.35; 'something': 0.35; 'but': 0.35; '+0200,': 0.36; 'possible': 0.36; 'changing': 0.37; 'too': 0.37; 'to:addr:python-list': 0.38; 'specialist': 0.39; 'to:addr:python.org': 0.39; 'received:org': 0.40; 'skip:u 10': 0.60; 'read': 0.60; 'extended': 0.61; 'skip:n 10': 0.64; 'account': 0.65; 'otten': 0.84; 'skip:] 10': 0.84; 'generation.': 0.91; 'try.': 0.91
X-Injected-Via-Gmane	http://gmane.org/
To	python-list@python.org
From	Peter Otten <__peter__@web.de>
Subject	Re: CSV methodology
Date	Tue, 16 Sep 2014 13:22:02 +0200
Organization	None
References	<b2q91ada6b59ept81ac65vtnnu6sdklp1h@4ax.com> <mailman.14005.1410678164.18130.python-list@python.org> <i5db1a9s5mvgsmg99q8kqf4l672fbrvp0n@4ax.com> <mailman.14017.1410766159.18130.python-list@python.org> <u53e1aha9hno97cpqd0ff6gt9otrtfjsof@4ax.com>
Mime-Version	1.0
Content-Type	text/plain; charset="ISO-8859-1"
Content-Transfer-Encoding	7Bit
X-Gmane-NNTP-Posting-Host	p57bd8bbb.dip0.t-ipconnect.de
User-Agent	KNode/4.13.3
X-BeenThere	python-list@python.org
X-Mailman-Version	2.1.15
Precedence	list
List-Id	General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe	<https://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe>
List-Archive	<http://mail.python.org/pipermail/python-list/>
List-Post	<mailto:python-list@python.org>
List-Help	<mailto:python-list-request@python.org?subject=help>
List-Subscribe	<https://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Newsgroups	comp.lang.python
Message-ID	<mailman.14051.1410866541.18130.python-list@python.org> (permalink)
Lines	49
NNTP-Posting-Host	2001:888:2000:d::a6
X-Trace	1410866541 news.xs4all.nl 2861 [2001:888:2000:d::a6]:48978
X-Complaints-To	abuse@xs4all.nl
Xref	csiph.com comp.lang.python:77927

Show key headers only | View raw

jayte wrote:

> On Mon, 15 Sep 2014 09:29:02 +0200, Peter Otten <__peter__@web.de> wrote:
> 
>>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",
> 
> Absolutely, just thought it would be interesting to start experimenting,
> while learning (plus, can't help but be anxious) <g>
> 
>> 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.
> 
> Will try.  Double extended precision is ten bytes, but I assume
> changing  the "f16" to "f10" would account for that...

Unfortunately it seems that numpy doesn't support "f10" 

>>> numpy.dtype("f8")
dtype('float64')
>>> numpy.dtype("f16")
dtype('float128')
>>> numpy.dtype("f10")
dtype('float32') # looks strange to me

But you better ask for confirmation (and possible workarounds) in a 
specialist forum.

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

csiph-web