SUOP - do unary arithmetic operation on segys 		

 suop <stdin >stdout op=abs					

 Required parameters:						
	none							

 Optional parameter:						
	op=abs		operation flag				
			abs   : absolute value			
			ssqrt : signed square root		
			sqr   : square				
			ssqr  : signed square			
			sgn   : signum function			
			exp   : exponentiate			
			slog  : signed natural log		
			slog10: signed common log		
			cos   : cosine				
			sin   : sine				
			tan   : tangent				
			cosh  : hyperbolic cosine		
			sinh  : hyperbolic sine			
			tanh  : hyperbolic tangent		
			norm  : divide trace by Max. Value	
			db    : 20 * slog10 (data)		
			neg   : negate value			
			posonly : pass only positive values	
			negonly : pass only negative values	
                       sum   : running sum trace integration   
                       diff  : running diff trace differentiation
                       refl  : (v[i+1] - v[i])/(v[i+1] + v[i]) 
			nop   : no operation			

 Note:	Binary ops are provided by suop2.			
 Operations slog and slog10 are "punctuated", meaning that if
 the input contains 0 values,	0 values are returned.		

 For file operations on non-SU format binary files use:  farith

 Credits:

	CWP: Shuki, Jack
	Toralf Foerster: norm and db operations, 10/95.

 Notes:
	If efficiency becomes important consider inverting main loop
      and repeating operation code within the branches of the switch.

	Note on db option.  The following are equivalent:
	... | sufft | suamp | suop op=norm | suop op=slog10 |\
		sugain scale=20| suxgraph style=normal

	... | sufft | suamp | suop op=db | suxgraph style=normal