Ulrich Dorda wrote: [Warning: I'm no expert and don't have numpy installed]
> I need a pytho nscript to read numbers(with loads of digits) from a > file, do some basic math on it and write the result out to another file. > > My problem: I don't get python to use more digits: > > In order to try this I type: > > The normal precision one: > >>> from numpy import * > >>> x=1.23456789123456789123456789 > >>> print "%35.25e" %x > 1.2345678912345679000000000e+000 > > > Now I try to use float64 to get more digits > > >>> z=zeros(3,float64) > >>> z[0] > 0.0 > >>> type(z[0]) > <type 'numpy.float64'> > >>> z[0]=1.23456789123456789123456789 The right side of the assignment is a float, so the extra digits would already be lost before you get a chance to convert to float64. But then Python's float is a C double and should already use 64 bits... > >>> type(z[0]) > <type 'numpy.float64'> > >>> print "%35.25e" %z[0] > 1.2345678912345679000000000e+000 > > This cuts the digits just like the 32bit case. > > Can anyone please help me get more digits? gmpy? Peter -- http://mail.python.org/mailman/listinfo/python-list
