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Math Software  -> Graph Function (Graph Calculus) -> Graphing Piecewise Functions
Function Grapher and Visual Calculus have the ability of graphing 2D piecewise functions. The following figure shows the graph of piecewise function
 
    y=x-1, if x<-1
    y=-1, if x=-1
    y=x+1, if x>-1

 

Math Software -> Graph Function (Graph Calculus) -> Graphing Piecewise Functions

 

  

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