[Numpy-discussion] Setting small numbers to zero.
Wed Mar 17 14:07:31 CDT 2010
On Wed, Mar 17, 2010 at 3:01 PM, Robert Kern <firstname.lastname@example.org> wrote:
> On Wed, Mar 17, 2010 at 14:04, Christopher Barker <Chris.Barker@noaa.gov> wrote:
>> Friedrich Romstedt wrote:
>>> import numpy
>>> import time
>>> a = numpy.random.random((2000, 2000))
>>> start = time.time()
>>> a[abs(a) < 10] = 0
>>> stop = time.time()
>> I highly recommend ipython and its "timeit" function --much better for this.
>> And numpy.clip() may be helpful here,
> No, it's not.
np.clip([-1,-5,1,1e90,np.inf, np.nan], 0, np.inf)
array([ 0.00000000e+00, 0.00000000e+00, 1.00000000e+00,
1.00000000e+90, Inf, NaN])
>> though last I checked, it's
>> written in Python,
> No, it isn't.
>> and thus not all that fast.
> No, it's reasonably performant.
> Robert Kern
> "I have come to believe that the whole world is an enigma, a harmless
> enigma that is made terrible by our own mad attempt to interpret it as
> though it had an underlying truth."
> -- Umberto Eco
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