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07-23-2008
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consecutive row comparison in awk (?)
hi, I'm totally new to this forum and to awk.
I have what I thought was a simple problem, but I can't get anything to work. Here is an example input file: 3.85 4018.4 3.9 4068.4 3.95 4082.9 4 4099.7 # Property:.......etc. 0 4733.3 0.05 4659.7 0.1 4585.6 0.15 4466.2 Two fields separated at arbitrary positions by blank lines and label headers. I want to compare the differences between $2 for all consecutive rows but only within each block delimited by the header: i.e. ABS(4733.3 - 4659.7), ABS(4659.7 - 4585.6), but not: ABS(4099.7 - 4733.3), etc. I want to record the largest difference (and the location!). Thanks for any help, Oscar 
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07-23-2008
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Something like this?
Code:
awk '
/^$/ { next }
/^#/ { print maxdiffrec, maxdiff; print; prev=""; maxdiff=0; next }
prev != "" {
absdiff=prev>$2 ? prev-$2 : $2-prev
if (absdiff > maxdiff) { maxdiff=absdiff; maxdiffrec=NR }
}
{ prev=$2 }
END { print maxdiffrec, maxdiff }
'
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