[Numpy-discussion] Re: where

Ryan Krauss ryanlists at gmail.com
Thu Apr 13 10:15:03 CDT 2006


> Why? The condition array that you would pass into where() is already such an array.

That is the key point I was missing.  Until I played around with the
conditions myself I didn't get that I was passing in an explicit array
of 1's and 0's.  I guess I thought I was passing in some magic
expression that where was some how making sense.  That is why I
thought I would need to pass f and phase to the function.

Ryan

On 4/13/06, Robert Kern <robert.kern at gmail.com> wrote:
> Ryan Krauss wrote:
> > f and phase are each (4250,)
> >
> > I have something that is working but doesn't use where.  Can this be
> > done easier using where:
> >
> > f1=f>19.5
> > f2=f<38
> > myf=f1&f2
> > myp=phase>0
> > myind=myf&myp
> > correction=myind*-360
> > newphase=phase+correction
>
> (untested)
> phase[((f>19.5) & (f<38)) & (phase>0)] -= 360
>
> > Basically, can where give me an output vector of the same size as f
> > and phase where the output is either 1 or 0?
>
> Why? The condition array that you would pass into where() is already such an array.
>
> --
> Robert Kern
> robert.kern at gmail.com
>
> "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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