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Case function in Mathematica

  1. Dec 24, 2011 #1
    Does anyone familiar with a convenient way in Mathematica to define a case function such as:

    [itex] y(x)=\left\{\begin{array}{c} x \\ -x\end{array}\begin{array}{c} x>0 \\ x<0\end{array}
    \right. [/itex]
    ?

    Thankes,
    Omri
     
  2. jcsd
  3. Dec 24, 2011 #2

    phyzguy

    User Avatar
    Science Advisor

    You want to use 'Piecewise':

    y[x_]:=Piecewise[{{x,x>0},{-x,x<0}}]
     
  4. Dec 24, 2011 #3
    Thankes,
    It's very helpful :)
     
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