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Use new stateful filter API for filtfilt #102

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Use new stateful filter API for filtfilt #102

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Commits on May 14, 2015

  1. Use new stateful filter API for filtfilt 

    This provides reduces the memory allocation and provides a small speed
boost (on 0.4; on 0.3, where SubArrays are slow, it's probably
substantially slower). We could conceivably use this to provide
in-place filtfilt, although that is not yet implemented.

I removed support for non-1 initial values of a in filt_stepstate,
since we don't need it if the filter is normalized before it is used.
    @simonster
    simonster committed May 14, 2015
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