On Tue, Dec 6, 2011 at 2:51 AM, Xavier Barthelemy <[email protected]> wrote:
> ok let me be more precise > > I have an Z array which is the elevation > from this I extract a discrete array of Zero Crossing, and another > discrete array of Crests. > len(crest) is different than len(Xzeros). I have a threshold method to > detect my "valid" crests, and sometimes there are 2 crests between two > zero-crossing (grouping effect) > > Crest and Zeros are 2 different arrays, with positions. example: > Zeros=[1,2,3,4] Arrays=[1.5,1.7,3.5] > > > and yes arrays can be sorted. not a problm with this. > > Xavier > > I may be oversimplifying this, but does searchsorted do what you want? In [314]: xzeros=[1,2,3,4]; xcrests=[1.5,1.7,3.5] In [315]: np.searchsorted(xzeros, xcrests) Out[315]: array([1, 1, 3]) This returns the indexes of xzeros to the left of xcrests. -Tony
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