Command: sqrt
  
Syntax: 
  x2 = sqrt(x1)   
  
Description: 
  Calculate the square root of x1.
  
Comments: 
  This function may be applied to an atom or to all elements
  of a sequence.
  
  Taking the square root of a negative number will abort your
  program with a run-time error message.
  
Example: 
     r = sqrt(16)
       -- r is 4
 
See Also: 
  log, power
  
