Question regarding the smooth filter function when using the Savitzky-Golay method
5 次查看(过去 30 天)
显示 更早的评论
When using the following line of code what is my polynomial order and frame width for my Savitzky-Golay filter? What are these default settings?
Y = smoothdata(X,'sgolay');
0 个评论
回答(2 个)
Jan
2021-8-19
According to the documentation, the degree can be determined and the window size is replied as 2nd output:
% SMOOTHDATA(...,'sgolay',...,'Degree',D) specifies the degree for the
% Savitzky-Golay filter.
% [B, WINSIZE] = SMOOTHDATA(...) also returns the moving window length.
You can set a breakpoint in the code of smoothdata to see, how the parameters are determined. In Matlab R2018b this line would be my point to start:
[dim,method,winsz,nanflag,t,sgdeg,dvars] = parseInputs(A, varargin{:});
0 个评论
Star Strider
2021-8-19
From the documentation:
‘... a fixed window length that is determined heuristically’
‘The value of 'Degree' corresponds to the degree of the polynomial in the Savitzky-Golay filter that fits the data within each window, which is 2 by default.’
(I prefer 'Degree',3, so I always specify it.)
0 个评论
另请参阅
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!