I don't know is it normal but I've faced with this
DATA="" href="http://www.mathworks.com/access/helpdesk/help/techdoc/ref/struct.html">struct("T",[-2:0.3:4]');
#a little experiment
octave:3> (DATA.T(2)-DATA.T(1))-(DATA.T(3)-DATA.T(2))
ans = 0
octave:4> DATA.T=single(DATA.T);
octave:5> (DATA.T(2)-DATA.T(1))-(DATA.T(3)-DATA.T(2))
ans = -1.1921e-07
So you can see that "single" function don't work correct.
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