how to solve piece-wise function?

Question

0 个投票

f(x)= {1 if x>=0, 0 if x=0, -1 if x<=0

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Guillaume 2015-11-10

Note that your function is ill-defined for x == 0, since it passes all three conditions. You should use strict comparison, < instead of <=.

rising falcon 2015-11-13

thak you

Answer 1

Guillaume 2015-11-10

编辑：Guillaume 2015-11-10

1 个投票

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.

rising falcon 2015-11-10

how to wirte it in matlab?why we use if and end statement to write it in matlab?

Guillaume 2015-11-10

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