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% Copyright David Rowe 2010
% This program is distributed under the terms of the GNU General Public License
% Version 2
% plots the difference of two files
function plsub(samname1, samname2, start_sam, end_sam, pngname)
fs1=fopen(samname1,"rb");
s1=fread(fs1,Inf,"short");
fs2=fopen(samname2,"rb");
s2=fread(fs2,Inf,"short");
st = 1;
en = length(s1);
if (nargin >= 3)
st = start_sam;
endif
if (nargin >= 4)
en = end_sam;
endif
figure(1);
clf;
l1 = strcat("r;",samname1,";");
plot(s1(st:en) - s2(st:en), l1);
%axis([1 en-st min(s1(st:en)) max(s1(st:en))]);
if (nargin == 5)
pngname = sprintf("%s.png",pngname);
print(pngname, '-dpng', "-S500,500")
pngname = sprintf("%s_large.png",pngname);
print(pngname, '-dpng', "-S800,600")
endif
endfunction