sulog

seismic software,very useful

SULOG -- time axis log-stretch of seismic traces
sulog [optional parameters] <stdin >stdout
Required parameters:
	none
Optional parameters:
	ntmin= .1*nt		minimum time sample of interest
	outpar=/dev/tty		output parameter file, contains:
				number of samples (nt=)
				minimum time sample (ntmin=)
				output number of samples (ntau=)
	m=3			length of stretched data
				is set according to
					ntau = nextpow(m*nt)
	ntau= pow of 2		override for length of stretched
				data (useful for padding zeros
				to avoid aliasing)
NOTES:
	ntmin is required to avoid taking log of zero and to
	keep number of outsamples (ntau) from becoming enormous.
        Data above ntmin is zeroed out.
	The output parameters will be needed by suilog to
	reconstruct the original data.
EXAMPLE PROCESSING SEQUENCE:
		sulog outpar=logpar <data1 >data2
		suilog par=logpar <data2 >data3