function?scatter3sph（XYZvarargin）
%SCATTER3SPH?（XYZ）?Makes?a?3d?scatter?plot?with?3D?spheres
%	SCATTER3SPH?is?like?scatter3?only?drawing?spheres?instead
%		of?flat?circles?at?coordinates?specified?by?vectors?X?Y?Z.?All?three
%		vectors?have?to?be?of?the?same?length.
%	SCATTER3SPH（XYZ）?draws?the?spheres?with?the?default?size?and?color.
%	SCATTER3SPH（XYZ‘size‘S）?draws?the?spheres?with?sizes?S.?If?length（S）=?1
%		the?same?size?is?used?for?all?spheres.
%	SCATTER3SPH（XYZ‘color‘C）?draws?the?spheres?with?colors?speciffied?in?a
%		N-by-3?matrix?C?as?RGB?values.
%	SCATTER3SPH（XYZ‘transp‘T）?applies?transparency?level?‘T‘?to?the?spheres
%		T=?0?=>?transparent?T=?1?=>?opaque.
%	Parameter?names?can?be?abreviated?to?3?letters.?For?example:?‘siz‘?or?
%		‘col‘.?Case?is?irrelevant.
%
%?Example
%?%Coordinates
%??X=?100*rand（91）;?Y=?100*rand（91）;?Z=?100*rand（91）;
%?
%?%Colors:?3?blue?3?red?and?3?green
%?C=?ones（31）*[0?0?1];
%?C=?[C;ones（31）*[1?0?0]];
%?C=?[C;ones（31）*[0?1?0]];
%?
%?%Sizes
%?S=?5+10*rand（91）;
%?
%?scatter3sph（XYZ‘size‘S‘color‘C‘trans‘0.3）;
%?axis?vis3d


%--?Some?checking...
if?nargin?if?mean（[length（X）length（Y）length（Z）]）?~=?length（X）?error?（‘Imput?vectors?X?Y?Z?are?of?different?lengths‘）;?return;?end

%--?Defaults
C=?ones（length（X）1）*[0?0?1];
S=?0.1*max（[X;Y;Z]）*ones（length（X）1）;
nfacets=?15;
transp=?0.5;


%--?Extract?optional?arguments
for?j=?1:2:length（varargin）
	string=?lower（varargin{j}）;
	switch?string（1:min（3length（string）））
		case?‘siz‘
			S=?varargin{j+1};
			if?length（S）?==?1
				S=?ones（length（X）1）*S;
			elseif?length（S）?				error（‘The?vector?of?sizes?must?be?of?the?same?length?as?coordinate?vectors?（or?1）‘）;
				return
			end

		case?‘col‘
			C=?varargin{j+1};
			if?size（C2）?			if?size（C1）?==?1
				C=?ones（length（X）1）*C（1:3）;
			elseif?size（C1）?				error（‘Colors?matrix?must?have?the?same?number?of?rows?as?length?of?coordinate?vectors?（or?1）‘）;
				return
			end

			case?‘fac‘
				nfacets=?varargin{j+1};

			case?‘tra‘
				transp=?varargin{j+1};

		otherwise
			error（‘Unknown?parameter?name.?Allowed?names:?‘‘size‘‘?‘‘color‘‘?‘‘facets‘‘?‘‘transparency‘‘?‘）;
	end
end


%--?Sphere?facets
[sxsysz]=?sphere（nfacets）;


%---?Correct?potential?distortion
maxax=?max（[range（X）?range（Y）?range（Z）]）;
ratios=?[range（X）/maxax?range（Y）/maxax?range（Z）/maxax];
sx=?sx*ratios（1）;
sy=?sy*ratios（2）;
sz=?sz*ratios（3）;


%--?Plot?spheres
hold?on
for?j=?1:length（X）
	surf（sx*S（j）+X（j）?sy*S（j）+Y（j）?sz*S（j）+Z（j）...
		‘Linestyle‘‘none‘...
		‘FaceColor‘C（j:）...
		‘FaceAlpha‘transp）;
end

daspect（[ratios（1）?ratios（2）?ratios（3）]）;
light（‘Position‘[1?1?1]‘style‘‘infinit‘‘Color‘[1?1?1]）;
lighting?gouraud;
view（3030）

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????文件????????2961??2014-10-02?18:19??scatter3sph.m
?????文件????????1509??2014-10-02?18:19??license.txt