On 06-Feb-12 07:25, Kapil Shukla wrote:
i tried writing a small code to calculate option price using the
binomial tree model. I compared my results with results of the same
program in excel. There seems to be a minor difference due to decimal
precision as excel is using 15 decimal precision and python (both 2.7
and 3.1) using 11. (at least that's what shown on shell)
If you need lots of precision, you might consider using the decimal
class. It'll cost you speed vs. the native floating-point type but
won't cause you round-off errors.
natively, Python uses IEEE double-precision math for all float objects.
For a float value x, instead of just printing it, try this:
print('{0:.30f}'.format(x))
can some one guide me whats the equivalent of using a double datatype on
python and i can't use long() in 3.1 any more.
Equivalent to what degree? Python's float class generally will get you
where you need to go. Also the int type automatically extends to
arbitrary-precision integer values so you don't need explicit "long"
type anymore. (Unless I misunderstood your question there.)
Please also suggest a free editor for python which can at least repeat
previous command with a key stroke
I use vim, which has that feature. I suspect any editor worth its salt
does, or could be programmed to.
--
Steve Willoughby / st...@alchemy.com
"A ship in harbor is safe, but that is not what ships are built for."
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