This is almost what I want to do. I had figured out that trick but my
problem is that the line that is input is, in my case, really long and
gulps a lot of memory.
Thus, to save memory, I need to read the numbers one by one (or a
small bunch of them at a time). It seems I have to read line by line,
which in my case of a really long line, is not easy.
Thanks anyhow !
On 4 juin, 10:14, Craig Citro <craigci...@gmail.com> wrote:
> > In short, anyone knows a simple trick provided by sage or python to
> > read numbers from a file without redoing the parsing stuff ?
>
> Luckily, both python's float type and Sage's RealDoubleField (or any
> of the RealFields) are smart enough to convert from strings:
>
> [craigci...@sharma ~/temp] $ cat reals.txt
> 3.14159
> 4
> 3.0e17
> -5
>
> [craigci...@sharma ~/temp] $ sage
> ----------------------------------------------------------------------
> | Sage Version 4.0, Release Date: 2009-05-29 |
> | Type notebook() for the GUI, and license() for information. |
> ----------------------------------------------------------------------
>
> sage: f = open('reals.txt')
> sage: [ RDF(x) for x in f.readlines() ]
> [3.14159, 4.0, 3e+17, -5.0]
> sage: f.close()
>
> sage: f = open('reals.txt')
> sage: [ float(x) for x in f.readlines() ]
> [3.1415899999999999, 4.0, 3e+17, -5.0]
> sage: f.close()
>
> Is that what you were looking to do? Or are your files of real numbers
> formatted differently?
>
> -cc
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