suflip.su.main

su 的源代码库

 SUFLIP - flip a data set in various ways			

 suflip <data1 >data2 flip=1 verbose=0				

 Required parameters:						
 	none							

 Optional parameters:						
 	flip=1 	rotational sense of flip			
 			+1  = flip 90 deg clockwise		
 			-1  = flip 90 deg counter-clockwise	
 			 0  = transpose data			
 			 2  = flip right-to-left		
 			 3  = flip top-to-bottom		
 	tmpdir=	 if non-empty, use the value as a directory path
		 prefix for storing temporary files; else if	
	         the CWP_TMPDIR environment variable is set use	
	         its value for the path; else use tmpfile()	

 	verbose=0	verbose = 1 echoes flip info		

 NOTE:  tr.dt header field is lost if flip=-1,+1.  It can be	
        reset using sushw.					

 EXAMPLE PROCESSING SEQUENCES:					
   1.	suflip flip=-1 <data1 | sushw key=dt a=4000 >data2	

   2.	suflip flip=2 <data1 | suflip flip=2 >data1_again	

   3.	suflip tmpdir=/scratch <data1 | ...			

 Caveat:  may fail on large files.				

 Credits:
	CWP: Chris Liner, Jack K. Cohen, John Stockwell

 Caveat:
	right-left flip (flip = 2) and top-bottom flip (flip = 3)
	don't require the matrix approach.  We sacrificed efficiency
	for uniform coding.

 Trace header fields accessed: ns, dt
 Trace header fields modified: ns, dt, tracl