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From: Ali Y. on 17 May 2010 09:42
Hi , I have two variable (x1 and y1), which y1 is a result of interpolation "interp1".
I want to calculate theta as below, but because of interp1, "ans" for each theta is not 0 (x=x1, y=y1, then theta(i) suppose to be 0 ). Then i tried to reduce the precision of y1 with fixpt_interp1, but it doesn't work. How can I reduce the precision of inputs (x1) and outputs (y1)?
thanks in advance

x=0:1;
y=1:-.1:0;
x1=1-y;
y1=interp1(x,y,x1);
theta=atan((y-y1)./(x1-x));

for thete:
ans=
NaN 0 0 NaN NaN NaN NaN NaN NaN NaN -1.5708

for x1-x:
ans =
1.0e-016 *
0 -0.2776 -0.5551 0 0 0 0 0 0 0 0

for y-y1:
ans =
1.0e-016 *
0 0 0 0 0 0 0 0 0 0 -0.2776
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