[SciPy-User] Single precision FFT insufficiently accurate.
Mon Jun 28 09:24:11 CDT 2010
Den 28.06.2010 13:21, skrev Sebastian Haase:
> What size of error are talking about anyway .. ?
> Personally I would leave it in,
Leave in FFT code that produces 5% relative error?
Single-precision is not the solution to memory issues anyway. Get a 64
bit system and buy more RAM. Buying RAM is far cheaper than even
re-coding for single precision, if you value the time spent coding, not
to mention that the result is far more accurate.
Single-precision used to be faster than double precision some 30 years
ago. And on 8 bit and 16 bit computers, memory did matter more. For
example on a 16 bit CPU with power-of-2 FFT, the largest FFT size would
be just 2096 in double precision. With single precision you could get
4096 ... Oorah! Today we rearely see those issues. Python does not even
support single precision.
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