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sgolayfilt

PURPOSE ^

% y = sgolayfilt (x, p, n [, m [, ts]])

SYNOPSIS ^

function y = sgolayfilt (x, p, n, m, ts)

DESCRIPTION ^

% y = sgolayfilt (x, p, n [, m [, ts]])
%    Smooth the data in x with a Savitsky-Golay smoothing filter of 
%    polynomial order p and length n, n odd, n > p.  By default, p=3
%    and n=p+2 or n=p+3 if p is even.
%
% y = sgolayfilt (x, F)
%    Smooth the data in x with smoothing filter F computed by sgolay.
%
% These filters are particularly good at preserving lineshape while
% removing high frequency squiggles. Particularly, compare a 5 sample
% averager, an order 5 butterworth lowpass filter (cutoff 1/3) and
% sgolayfilt(x, 3, 5), the best cubic estimated from 5 points:
%
%    [b, a] = butter(5,1/3);
%    x=[zeros(1,15), 10*ones(1,10), zeros(1,15)];
%    plot(sgolayfilt(x),'r;sgolayfilt;',...
%         filtfilt(ones(1,5)/5,1,x),'g;5 sample average;',...
%         filtfilt(b,a,x),'c;order 5 butterworth;',...
%         x,'+b;original data;');
%
% See also: sgolay

CROSS-REFERENCE INFORMATION ^

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