On Jan 6, 8:29 pm, Mark Dickinson wrote:
> Note that it's still subject to the same limitations as anything
> else for trig_function(really huge argument), of course:
>
> >>> import mpmath
> >>> mpmath.cos(mpmath.mpf('1e9'))
>
> [... still waiting for a result 30 minutes later ...]
>
> (n
On Jan 6, 3:23 pm, Fredrik Johansson
wrote:
> FYI, mpmath (http://code.google.com/p/mpmath/) implements arbitrary-
> precision standard transcendental functions in pure Python. It is much
> faster than decimal, dmath, decimalfuncs and AJDecimalMathAdditions,
> and handles huge arguments just fine.
On Dec 28 2008, 4:55 pm, jerry.carl...@gmail.com wrote:
> > - are you usingDecimalfor the base-10-ness or the
> > extra precisionDecimalprovides? Or significant zeros?
> > Or compatibility with existingDecimalcode, or what?
>
> Oh boy, now I will finally prove myself illiterate... well, so be
Yes I ran strace python and imported math
time(NULL) = 1231244692
futex(0x80575d8, FUTEX_WAKE, 1) = 0
stat64("math", 0xbfabef50) = -1 ENOENT (No such file or
directory)
open("math.so", O_RDONLY|O_LARGEFILE) = -1 ENOENT (No such file or
directory)
On Mon, Jan 5, 2009 at 4:50 PM, alex goretoy
wrote:
> I get this when importing decimal:
>
> Python 2.7a0 (trunk:68339M, Jan 5 2009, 05:18:41)
> [GCC 3.4.6] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
import decimal
> Traceback (most recent call last):
>
> Hmm. Maybe we shouldn't be using this syntax in from_float, if it's
> the only thing that prevents the trunk version of decimal.py from
> being used with Python 2.4. On the other hand, from_float isn't
> going to work until 2.7 anyway, since it uses a whole bunch of
> new stuff: as_integer_r
On Jan 4, 10:38 am, "alex goretoy"
wrote:
> haha python-svn # python Lib/decimal.py
> File "Lib/decimal.py", line 683
> sign = 0 if _math.copysign(1.0, f) == 1.0 else 1
> ^
> SyntaxError: invalid syntax
>
> Although, It may be only because I ran it through python 2.4.3
Ah yes,
No, I know there's a typo because python told me there is. If you have svn
repo locally. then cd into Lib/ and run python decimal.py
It will tell you line 683 has syntax error, please see below.
haha python-svn # python Lib/decimal.py
File "Lib/decimal.py", line 683
sign = 0 if _math.copysi
On Jan 4, 9:52 am, "alex goretoy" wrote:
> Also, another reason why I'm posting to this thread. I noticed some
> error/typo in line 683 of decimal.py located on public svn repo. This is
> what is looks like.
>
> sign = 0 if _math.copysign(1.0, f) == 1.0 else 1
This line looks okay to me;
I've been watching this thread for couple days now. I followed the bug
report and all that stuff. It's very interesting to me how you guys talk
about this stuff. I like it alot. I a new guy to python, just fyi. I'm one
of my current projects I'm using Decimal as well and I think it be a huge
pain i
On Sat, 03 Jan 2009 13:34:11 -0800, Mark Dickinson wrote:
> On Jan 3, 9:27 pm, Mark Dickinson wrote:
>> Decimal.from_float() implemented by Raymond Hettinger for Python 2.7
>> and Python 3.1, within 72 hours of Steven submitting the feature
>> request. If only all issues could be resolved this q
On Jan 3, 9:27 pm, Mark Dickinson wrote:
> Decimal.from_float() implemented by Raymond Hettinger for Python 2.7
> and Python 3.1, within 72 hours of Steven submitting the feature
> request. If only all issues could be resolved this quickly. :-)
Rats. I left out the crucial line of that post, na
On Dec 31 2008, 11:02 pm, Steven D'Aprano wrote:
> On Sun, 28 Dec 2008 06:38:32 -0800, Mark Dickinson wrote:
> > On Dec 28, 7:28 am, Steven D'Aprano > cybersource.com.au> wrote:
> >> Ah crap, I forgot that from_float() has been left out of the decimal
> >> API. That's very annoying.
>
> > Agreed.
On Sun, 28 Dec 2008 06:38:32 -0800, Mark Dickinson wrote:
> On Dec 28, 7:28 am, Steven D'Aprano cybersource.com.au> wrote:
>> Ah crap, I forgot that from_float() has been left out of the decimal
>> API. That's very annoying.
>
> Agreed. It's maybe even annoying enough that a feature request at
jerry.carl...@gmail.com wrote:
...
It's really just the goniometric functions that I am missing most at
the moment, so maybe I can figure it out with help of what you said
plus the already existing imperfect modules. Meantime maybe this
discussion will caught Guido's eye... ;-) And btw I do expec
On Dec 29, 10:22 am, Steve Holden wrote:
> Raymond L. Buvel wrote:
> > Since the interest is more in extended precision than in decimal
> > representation, there is another module that may be of interest.
>
> >http://calcrpnpy.sourceforge.net/clnum.html
>
> > It interfaces to the Class Library for
Raymond L. Buvel wrote:
> Since the interest is more in extended precision than in decimal
> representation, there is another module that may be of interest.
>
> http://calcrpnpy.sourceforge.net/clnum.html
>
> It interfaces to the Class Library for Numbers (CLN) library to provide
> both arbitrar
Since the interest is more in extended precision than in decimal
representation, there is another module that may be of interest.
http://calcrpnpy.sourceforge.net/clnum.html
It interfaces to the Class Library for Numbers (CLN) library to provide
both arbitrary precision floating point and comp
mpmath... wow... just did what i needed :-)
Thanks, Mark! Hopefully i did not waste too much of your time... and
perhaps this discussion will send other lost sheeps in the right
direction.
(Still, it would make sense to have the goniometric functions in
decimal.)
--
http://mail.python.org/mai
> 1. mpmath?
> 2. sympy?
> 3. Sage?
Haven't tried those, i guess i have some studying to do.
>
> > x=Decimal.__mod__(x,Decimal('2')*pi())
>
> > Works fine for what i need, but i am sure it's not the right way to do
> > it.
>
> I don't know of any better way to deal with large arguments.
> The m
On Dec 28, 3:55 pm, jerry.carl...@gmail.com wrote:
> But i am after the extra precision:
>
> >>> from math import *
> >>> (1+1e-16)-1
>
> 0.0
Sounds like you don't care too much about the base-10 part,
so there may be other solutions out there.
Have you tried:
1. mpmath?
2. sympy?
3. Sage?
Any
> - are you using Decimal for the base-10-ness or the
> extra precision Decimal provides? Or significant zeros?
> Or compatibility with existing Decimal code, or what?
Oh boy, now I will finally prove myself illiterate... well, so be it.
But i am after the extra precision:
>>> from math imp
On Dec 28, 7:28 am, Steven D'Aprano wrote:
> Ah crap, I forgot that from_float() has been left out of the decimal API.
> That's very annoying.
Agreed. It's maybe even annoying enough that a feature request
at bugs.python.org might be honoured. (Hint, hint!)
It's fairly easy to emulate in Pytho
On Dec 28, 12:02 am, jerry.carl...@gmail.com wrote:
> I have been looking for a Python module with math functions that would
> both eat and spit Decimals. The standard math module eats Decimals
> allright but spits floats.
Yes: it just converts the input (whether float, int, Fraction or
Decimal) t
Hi Steven... thanks for your kind and extensive reply. Lots of good
food for thought. I know it's easy to complain about lack of
functionality, but it really was not my intention. Python is very cool
as it is and I still know too little about it to even suggest
anything. I just thought maybe I was
On Sat, 27 Dec 2008 21:50:09 -0800, jerry.carl.mi wrote:
>> Which math functions? ln, log10, exp, sqrt already exist as methods of
>> Decimal instances. At the end of the Decimal docs there are a few
>> examples, including computing sin and cos (but apparently they naïvely
>> use a McLaurin series
On Sun, 28 Dec 2008 06:58:18 +, Steven D'Aprano wrote:
> def make_decimal(f, precision=16):
> # choose how many decimal places you want to keep return
> Decimal.from_float(f, precision)
Ah crap, I forgot that from_float() has been left out of the decimal API.
That's very annoying.
S
On Sat, 27 Dec 2008 16:02:51 -0800, jerry.carl.mi wrote:
> Hi,
>
> I have been looking for a Python module with math functions that would
> both eat and spit Decimals. The standard math module eats Decimals
> allright but spits floats... herefore exp(sin(Decimal())) produces exp
> () of a float :
> Which math functions? ln, log10, exp, sqrt already exist as methods of
> Decimal instances. At the end of the Decimal docs there are a few
> examples, including computing sin and cos (but apparently they naïvely use
> a McLaurin series like you noticed in other module).
Hi Gabriel - than
En Sat, 27 Dec 2008 22:02:51 -0200, escribió:
I have been looking for a Python module with math functions that would
both eat and spit Decimals. The standard math module eats Decimals
allright but spits floats... herefore exp(sin(Decimal())) produces exp
() of a float :-(
Which math functions
Hi,
I have been looking for a Python module with math functions that would
both eat and spit Decimals. The standard math module eats Decimals
allright but spits floats... herefore exp(sin(Decimal())) produces exp
() of a float :-(
So far, i found:
-AJDecimalMathAdditions (http://www.ajgs.com/pro
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