comparison toolboxes/MIRtoolbox1.3.2/MIRToolbox/mirspread.m @ 0:e9a9cd732c1e tip

first hg version after svn

+function varargout = mirspread(orig,varargin)
+%   S = mirspread(x) calculates the spread of x, which can be either:
+%       - a spectrum (spectral spread),
+%       - an envelope (temporal spread), or
+%       - any histogram.
+
+
+varargout = mirfunction(@mirspread,orig,varargin,nargout,struct,@init,@main);
+
+
+function [x type] = init(x,option)
+if not(isamir(x,'mirdata')) || isamir(x,'miraudio')
+    x = mirspectrum(x);
+end
+type = 'mirscalar';
+
+
+function S = main(x,option,postoption)
+if iscell(x)
+    x = x{1};
+end
+y = peaksegments(@spread,get(x,'Data'),...
+                         get(x,'Pos'),...
+                         get(mircentroid(x),'Data'));
+if isa(x,'mirspectrum')
+    t = 'Spectral spread';
+elseif isa(x,'mirenvelope')
+    t = 'Temporal spread';
+else
+    t = ['Spread of ',get(x,'Title')];
+end
+S = mirscalar(x,'Data',y,'Title',t);
+
+
+function s = spread(d,p,c)
+s = sqrt( sum((p-c).^2.*d) ) ./ sum(d);