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function BeampositionTest(n, screenid, synced)
AssertOpenGL;
if nargin < 1
n = 10000;
end
if nargin < 2
screenid = max(Screen('Screens'));
end
screenid
if nargin < 3
synced = 0;
end
w=Screen('OpenWindow', screenid, 0);
Screen('Flip',w);
beampos = zeros(n, 1);
t = zeros(n, 1);
for i=1:n
if synced
Screen('Flip', w);
end
beampos(i) = Screen('GetWindowInfo', w, 1);
t(i) = GetSecs;
end
while Screen('GetWindowInfo', w, 1) < 500; end;
ta=GetSecs;
while Screen('GetWindowInfo', w, 1)< 515; end;
te=GetSecs;
tel = (te - ta) * 1000
Screen('CloseAll');
figure;
plot(beampos);
figure;
plot(diff(t));
figure;
hist(beampos, 1500);
figure;
plot(t, beampos);
return;
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