SQR Function
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 Action

 Returns the square root of a numeric expression.


 Syntax



  SQR( numeric-expression)

 Remarks


 The argument  numeric-expression must be greater than or equal to 0.

  SQR is calculated in single precision if  numeric-expression is an integer
 or single-precision value. If you use any other numeric data type,  SQR is
 calculated in double precision.


 Example

 The following example uses the  SQR function to plot the graph of y =
 sqr(abs(x)) for -9  x  9 .


 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