Gabriele Brambilla <gb.gabrielebrambi...@gmail.com> writes: > the values in www are like 1.01e-134 and also smaller, and I sum values > like this: there could be any problem summing so small numbers?
The default floating-point number type in Python is a fixed-precision float <URL:http://docs.python.org/3/library/stdtypes.html#typesnumeric>. Yes, with the ‘float’ type calcuations will lose information, and calculations at differing orders of magnitude will lose information faster. That's a limitation of any fixed-precision float implementation. If you want to use different types with different trade-offs, see <URL:http://docs.python.org/3/library/stdtypes.html#typesnumeric> the Python documentation and the NumPy documentation <URL:http://docs.scipy.org/doc/numpy/user/basics.types.html> for the numeric data types they support. -- \ “If [a technology company] has confidence in their future | `\ ability to innovate, the importance they place on protecting | _o__) their past innovations really should decline.” —Gary Barnett | Ben Finney _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
