PolcLog

The PolcLog is an extension to Polc. Instead of a polynomial with n x m coefficients :

v(f,t) = c₀₀ + c₀₁t + c₁₀f + c₁₁f t + c₀₂t² + c₂₀f² + ....

it replaces f, t with -> ¹⁰log(f/l₀) , ¹⁰log(t/l₀).

To create a PolcLog from glish call:

my_logpolc:=meq.polc(my_array,class='MeqPolcLog');

Per default the transformation is applied both on the frequency and time axis (and no other axis) and l₀ = 1. The user can define its own set of axes and scales by defining the record axis_list, eg.:

my_logpolc.axis_list = {freq=3.}

or:

my_logpolc.axis_list = {freq=3.,time=0}

will leave time unchanged and use l₀=3 for frequency.

The scales are stored in the ParmTable in the column 'LScale', at the moment only time/freq is supported.

This class can be used as an example class to define other functions on the axis.