how to solve piece-wise function?

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rising falcon
rising falcon on 10 Nov 2015
Commented: rising falcon on 13 Nov 2015
f(x)= {1 if x>=0, 0 if x=0, -1 if x<=0
  2 Comments
Guillaume
Guillaume on 10 Nov 2015
Note that your function is ill-defined for x == 0, since it passes all three conditions. You should use strict comparison, < instead of <=.

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Answers (1)

Guillaume
Guillaume on 10 Nov 2015
Edited: Guillaume on 10 Nov 2015
That function has a name, it's the signum function, called sign in matlab.
I'm not sure what you mean by solve. The roots of that function is obviously just 0.
  2 Comments
rising falcon
rising falcon on 10 Nov 2015
how to wirte it in matlab?why we use if and end statement to write it in matlab?
Guillaume
Guillaume on 10 Nov 2015
How to write functions and how to use if statement is covered in the Getting Started tutorial in the doc and in million of other tutorials.
function s = mysignum(x)
if x > 0
s = 1;
elseif x < 0
s = -1;
else
s = 0;
end
end

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