samer@0: % mt_get_transmat_at - Get transition matrix near given point in information space.
samer@0: %
samer@0: % mt_get_transmat_at ::
samer@0: %    mt_system ~'Melody Triangle system structure',
samer@0: %    natural   ~'voice Id (1 or greater)',
samer@0: %    K:natural ~'size of transition matrix',
samer@0: %    real      ~'X-coordinate',
samer@0: %    real      ~'Y-coordinate'
samer@0: % -> [[K,K]]   ~'transition matrix',
samer@0: %    [[1,3]]   ~'information coordinates'.
samer@0: %
samer@0: % The selected transition matrix will be shown using mt_show_transmat,
samer@0: % and it's information coordinates printed in the title of the main scatter plot.
samer@0: 
samer@0: function [T,I]=mt_get_transmat_at(Sys,Id,K,X,Y)
samer@0: 	normpos = Sys.map([X;Y])';
samer@0: 	target = normpos *log(K);
samer@0: 	tmats = Sys.transmats{K};
samer@0: 	info = Sys.info{K};
samer@0: 	L = size(info,1);
samer@0: 
samer@0: 	% distance from target
samer@0: 	d2 = sum((info(:,1:2) - repmat(target,L,1)).^2,2);
samer@0: 	Mask = d2<=max(min(d2)*2,0.01);
samer@0: 
samer@0: 	M = find(Mask);
samer@0: %	J = M(argmax(info(M,3)));
samer@0: 	J = M(1+floor(length(M)*rand));
samer@0: 	T = tmats(:,:,J);
samer@0: 	I = info(J,:);
samer@0: 	%Mask=2*int16(Mask); Mask(J)=1;
samer@0: 	%set(Sys.hScat{K},'CDATA',Mask); % scatc(info,Mask,16); rotate3d on;
samer@0: 	figure(Sys.fig); title(sprintf('info: %.2f, %.2f, %.2f',I(1),I(2),I(3)));
samer@0: 	%figure(50); title(sprintf('pos: %.2f, %.2f',normpos(1), normpos(2)));
samer@0: 	%fprintf('normpos: %.2f, %.2f',normpos(1), normpos(2));
samer@0: 	mt_show_transmat(Id,T);
samer@0: end