triple running-mean filter

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The following script will call a simple running mean three times with appropriate window size to do effect triple running mean, as described in the article (as amended for the asymmetric kernel to minimise negative leakage):

https://climategrog.wordpress.com/2013/05/19/triple-running-mean-filters/

It requires the runmean.awk script found here:
https://climategrog.wordpress.com/2013/11/02/574/

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#!/bin/bash

# call runmean.awk three times to compose triple running mean
# usage: ./r3m.sh file window_len   ; default window is 12 data point

if [ "x$1" == "x"  ]; then echo "$0 : err no file name,   usage: $0 filename "
 exit 1;
else fn=$1
fi

if [ "x$2" == "x"  ]; then win=12; else win=$2; fi

#win2=`awk "BEGIN{print $win/ 1.3371}"`
#win3=`awk "BEGIN{print $win/ 1.3371/ 1.3371}"`


# asymmetric stages with following window ratios:
k=1.15; k2=1.58

win2=`awk "BEGIN{print $win/ "$k"}"`
win3=`awk "BEGIN{print $win/ "$k2" }"`

outfile=`echo $fn | awk '{ print substr($1,1,length($1)-4) }'`
outfile+="-3rm"$win".dat"

echo  "# triple running mean :  $win  $win2  $win3 " > $outfile

# echo $fn; echo $win; echo $win2; echo $win3

cat $fn | ./runmean.awk - $win |  ./runmean.awk - $win2 |  ./runmean.awk - $win3 >> $outfile

#echo "# cat $fn | ./runmean.awk - $win |  ./runmean.awk - $win2 |  ./runmean.awk - $win3 >> $outfile"

echo "# triple running mean :  $win  $win2  $win3 "
echo "# outfile = "$outfile;