how to solve a system of equations in matlab

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Jens Petit-jean
Jens Petit-jean 2020-11-29
回答： Ameer Hamza 2020-11-29
hello,
How do I solve this system of equations in matlab for F(-2:2) ?
f(x)= x+2 if x<=0
-x+2 if x>0
Apparently you can't use an if for this solution, but I don't really understand why either.
Thanks in advance

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Alan Stevens
Alan Stevens 2020-11-29
编辑：Alan Stevens 2020-11-29
Try this
f = @(x) (x+2).*(x<=0) + (-x+2).*(x>0);
(x<=0) returns 1's where it's true and 0 where it's false. Similarly for (x>0)

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Ameer Hamza
Ameer Hamza 2020-11-29
An alternate from symbolic toolbox
syms x
F = piecewise(x<=0, x+2, x>0, -x+2);
fplot(F, [-2 2])

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