[BangPypers] Exponential : warning overflow

Santosh Chiniwar santosh.chini at gmail.com
Wed Mar 30 04:31:34 EDT 2016


Thanks for mail. I can get this for Mac OSx.

thank you very much



*Santosh P. Chiniwar*

*----------------------------------Research Scholar, Thin Film Measurement
Lab *
*Department of Electronics Engineering*
*Chang Gung University, Taiwan (ROC)*
*259 Wenhua 1st Rd., Guishan Dist., Taoyuan, *
*33302, **Taiwan (ROC), **Tel.: +886-3211-8800*
*-ext.535 **Mob: +886-905667324*

The first principle is that you must not fool yourself-and you are the
easiest person to fool..... Richard Feynman



On 30 March 2016 at 16:19, Anand Reddy Pandikunta <anand21nanda at gmail.com>
wrote:

> You need to install bigfloat module first.
> See here for instructions
> <http://bigfloat.readthedocs.org/en/latest/#installation>.
>
> Once it is done, use bigfloat.exp instead of numpy.exp.
>
> In [31]: v = numpy.linspace(0, 100, 10)
>
> In [32]: from bigfloat import precision, exp
>
> In [33]: with precision(100000):
>    ....:         j = [exp(i/1.3806488e-23) for i in v]
>
>
> Cheers,
> Anand Reddy Pandikunta (@ChillarAnand)
> www.avilpage.com
>
>
> On Wed, Mar 30, 2016 at 12:46 PM, Santosh Chiniwar <
> santosh.chini at gmail.com>
> wrote:
>
> > Thanks for kind reply. I am new to this python coding. Could you please
> > tell me how use bigfloat to fix this overflow problem
> >
> > I am getting overflow for following values
> >
> >      v = numpy.linspace(0, 100, 10)
> >      j= numpy.exp(v/1.3806488e-23)
> >
> >
> >
> > I have tried to use   In [30]: from bigfloat import *
> >
> >
> ---------------------------------------------------------------------------
> >
> > ImportError                               Traceback (most recent call
> last)
> >
> > <ipython-input-30-45ecbac7174b> in <module>()
> >
> > ----> 1 from bigfloat import *
> >
> >
> > ImportError: No module named 'bigfloat'
> >
> >
> >
> >
> >
> >
> > *Santosh P. Chiniwar*
> >
> > *----------------------------------Research Scholar, Thin Film
> Measurement
> > Lab *
> > *Department of Electronics Engineering*
> > *Chang Gung University, Taiwan (ROC)*
> > *259 Wenhua 1st Rd., Guishan Dist., Taoyuan, *
> > *33302, **Taiwan (ROC), **Tel.: +886-3211-8800*
> > *-ext.535 **Mob: +886-905667324*
> >
> > The first principle is that you must not fool yourself-and you are the
> > easiest person to fool..... Richard Feynman
> >
> >
> >
> > On 29 March 2016 at 21:34, Gora Mohanty <gora at mimirtech.com> wrote:
> >
> > > On 29 March 2016 at 17:14, Santosh Chiniwar <santosh.chini at gmail.com>
> > > wrote:
> > > > Dear BangPypers,
> > > >   Please find my code and I get Overflow warning. I am unable to
> > continue
> > > > further. Any support or help is appreciated.
> > >
> > > Somewhere you are getting too large a number for the range of type in
> > > the array that you are using: probably because you are dividing by the
> > > very small Boltzmann constant.
> > >
> > > You either need to use a type with a bigger range, say bigfloat for
> > > arbitrary precision floating-point arithmetic, or if the errors only
> > > occur for values that can be ignored, see
> > > http://docs.scipy.org/doc/numpy/reference/generated/numpy.seterr.html
> > > for how to ignore errors.
> > >
> > > Incidentally, all this information is available from an easy Google
> > search.
> > >
> > > Regards,
> > > Gora
> > > _______________________________________________
> > > BangPypers mailing list
> > > BangPypers at python.org
> > > https://mail.python.org/mailman/listinfo/bangpypers
> > >
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