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' This example uses the SQR function to plot the graph of y = SQR(ABS(x))
' for -9 <= x <= 9.
 
' To try this example:
' 1. Choose New Project from the File menu
' 2. Copy the code example below to the code window
' 3. Press F5 to run the example
 
 CLS                          ' Clear the screen
 SCREEN 1: COLOR 1            ' Low-resolution color graphics mode
 WINDOW (-9, -.25)-(9, 3.25)  ' Convert screen to Cartesian coordinates
 LINE (-9, 0)-(9, 0)          ' Draw X-axis
 LINE (0, -.25)-(0, 3.25)     ' Draw Y-axis
 FOR X = -9 TO 9
     LINE (X, .04)-(X, -.04)  ' Put tick marks on X-axis
 NEXT X
 FOR Y = .25 TO 3.25 STEP .25
     LINE (-.08, Y)-(.12, Y)  ' Put tick marks on Y-axis
 NEXT Y
 PSET (-9, 3)                 ' Plot the first point of function
 FOR X = -9 TO 9 STEP .25
     Y = SQR(ABS(X))          ' SQR argument cannot be negative
     LINE -(X, Y), 2          ' Draw a line to the next point
 NEXT X