Hello all,
I'm trying to find the series resonant frequency of an RF component, which
is where the component reactance switches from positive to negtive or
vice-versa.
Given an N-vector PDL of sorted elements, I need to know at what index it
switches from positive to negative.
Here are some examples; in real life these are real values from physical
measurements, so they are never going to be nice round integers---but you
can assume they will be sorted in ascending or descending order.
Example 1:
pdl> p sequence(10)-5
[-5 -4 -3 -2 -1 0 1 2 3 4]
^^
I need to know "index 4" is the place at which it switches.
Example 2:
pdl> p ((-sequence(10))+5+rand())
[ 5.3332316 4.3332316 3.3332316 2.3332316 1.3332316 0.33323163
-0.66676837 -1.6667684 -2.6667684 -3.6667684]
^^^^^^^^^^
In this floating-point example it would be "index 5"
Is there already a "PDL-broadcast-way" of doing this?
How would you do it?
--
Eric Wheeler
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