You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: wave_signif.m
    path of file: ./repos/acycle/code/package/wavelet
    
    the code of the file until where you have to start completion: %WAVE_SIGNIF  Significance testing for the 1D Wavelet transform WAVELET
%
%   [SIGNIF,FFT_THEOR] = ...
%      wave_signif(Y,DT,SCALE,SIGTEST,LAG1,SIGLVL,DOF,MOTHER,PARAM)
%
% INPUTS:
%
%    Y = the time series, or, the VARIANCE of the time series.
%        (If this is a single nu
    
function of SCALE
%    FFT_THEOR = output theoretical red-noise spectrum as fn of PERIOD
%
%
% OPTIONAL INPUTS:
% *** Note *** setting any of the following to -1 will cause the default
%               value to be used.
%
%    SIGTEST = 0, 1, or 2.    If omitted, then assume 0.
%
%         If 0 (the default), then just do a regular chi-square test,
%             i.e. Eqn (18) from Torrence & Compo.
%         If 1, then do a "time-average" test, i.e. Eqn (23).
%             In this case, DOF should be set to NA, the number
%             of local wavelet spectra that were averaged together.
%             For the Global Wavelet Spectrum, this would be NA=N,
%             where N is the number of points in your time series.
%         If 2, then do a "scale-average" test, i.e. Eqns (25)-(28).
%             In this case, DOF should be set to a
%             two-element vector [S1,S2], which gives the scale
%             range that was averaged together.
%             e.g. if one scale-averaged scales between 2 and 8,
%             then DOF=[2,8].
%
%    LAG1 = LAG 1 Autocorrelation, used for SIGNIF levels. Default is 0.0
%
%    SIGLVL = significance level to use. Default is 0.95
%
%    DOF = degrees-of-freedom for signif test.
%         IF SIGTEST=0, then (automatically) DOF = 2 (or 1 for MOTHER='DOG')
%         IF SIGTEST=1, then DOF = NA, the number of times averaged together.
%         IF SIGTEST=2, then DOF = [S1,S2], the range of scales averaged.
%
%       Note: IF SIGTEST=1, then DOF can be a vector (same length as SCALEs),
%            in which case NA is assumed to vary with SCALE.
%            This allows one to average different numbers of times
%            together at different scales, or to take into account
%            things like the Cone of Influence.
%            See discussion following Eqn (23) in Torrence & Compo.
%
%
%----------------------------------------------------------------------------
%   Copyright (C) 1995-1998, Christopher Torrence and Gilbert P. Compo
%   University of Colorado, Program in Atmospheric and Oceanic Sciences.
%   This software may be used, copied, or redistributed as long as it is not
%   sold and this copyright notice is reproduced on each copy made.  This
%   routine is provided as is without any express or implied warranties
%   whatsoever.
%----------------------------------------------------------------------------
function [signif,fft_theor] = ...
	wave_signif(Y,dt,scale1,sigtest,lag1,siglvl,dof,mother,param);

if (nargin < 9), param = -1;, end