Not getting the right output for my if statement? [piecewise function]
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(Ajay deleted this so I (MF) am restoring it).
% code
function y = FcnEval(x)
if x < -2
y= -1./ ((x.^2) + 1)
elseif -2 <= x < -1
y= sin(x)
elseif -1 <= x < 1
y= x.^2
elseif 1 <= x < 2
y=2
else x >= 2
y=1./(x+1)
end
but when I run the test case: x1 = 3; x2 = -2:2;
y1 = FcnEval(x1)
y2 = FcnEval(x2)
I'm supposed to get y1 = 0.2500
y2= -0.9093 1.0000 0 2.0000 0.3333
what am i doing wrong?
3 Comments
Matt Fig
on 9 Oct 2012
Saved from google cache:
% code
function y = FcnEval(x)
if x < -2
y= -1./ ((x.^2) + 1)
elseif -2 <= x < -1
y= sin(x)
elseif -1 <= x < 1
y= x.^2
elseif 1 <= x < 2
y=2
else x >= 2
y=1./(x+1)
end
but when I run the test case: x1 = 3; x2 = -2:2;
y1 = FcnEval(x1)
y2 = FcnEval(x2)
I'm supposed to get y1 = 0.2500
y2= -0.9093 1.0000 0 2.0000 0.3333
what am i doing wrong?
Accepted Answer
Daniel Shub
on 8 Oct 2012
Edited: Daniel Shub
on 8 Oct 2012
First off, I doubt your code runs since else if is not valid syntax. Second, I am pretty sure that 1 <= x < 2 is not doing what you think it is doing.
5 Comments
Daniel Shub
on 8 Oct 2012
What do you think MATLAB should do with
if 1 <= -2:2 & -2:2 < 2
disp('true');
else
disp('false');
end
MATLAB does exactly what you tell it to do. You need to be careful with arrays ...
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