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#!/bin/bash
# Functions to compute average and standard deviation from a list of integers
# returns the average of a list of integers
avg() {
local RESULT="$1"
local SUM=0
local COUNT=0
for PARAM in $2;
do
set -- $PARAM
SUM=$(($SUM+$1))
COUNT=$(($COUNT+1))
done
if [ $COUNT == 0 ]
then
echo "Error: avg(): empty list"
return -1
fi
eval "$RESULT=\"$(echo "scale=4; $SUM/$COUNT" | bc)\""
return 0
}
# returns the standard deviation of a list of integers
sdv() {
local RESULT="$1"
local AVG=0
avg AVG "$2"
local DIFF=0
local SUMDIFF2=0
local COUNT=0
for PARAM in $2;
do
set -- $PARAM
DIFF=$(echo "scale=4; $1-$AVG" | bc)
SUMDIFF2=$(echo "scale=4; $SUMDIFF2 + $DIFF ^2" | bc)
COUNT=$(($COUNT+1))
done
if [ $COUNT == 0 ]
then
echo "Error: sdv(): empty list"
return -1
fi
eval "$RESULT=\"$(echo "scale=4; sqrt($SUMDIFF2/$COUNT)" | bc)\""
return 0
}
# returns both the average and the standard deviation
stats() {
local AVGRESULT="$1"
local SDVRESULT="$2"
local DATALIST="$3"
local AVG=0
avg AVG "$DATALIST"
local DIFF=0
local SUMDIFF2=0
local COUNT=0
for PARAM in $DATALIST;
do
set -- $PARAM
DIFF=$(echo "scale=4; $1-$AVG" | bc)
SUMDIFF2=$(echo "scale=4; $SUMDIFF2 + $DIFF ^2" | bc)
COUNT=$(($COUNT+1))
done
if [ $COUNT == 0 ]
then
echo "Error: stats(): empty list"
return -1
fi
eval "$AVGRESULT=\"$AVG\""
eval "$SDVRESULT=\"$(echo "scale=4; sqrt($SUMDIFF2/$COUNT)" | bc)\""
return 0
}
runx() {
local COMMAND=$1
local LIMIT=$2
local COUNT=0
local T1=0
local T2=0
local DIFFTIME=0
local LIST=""
echo "[---TIMING LOG---] Running \"$COMMAND\" $LIMIT times"
while [ "$COUNT" -lt "$LIMIT" ]
do
T1=`date +%s`
$COMMAND
T2=`date +%s`
DIFFTIME=$(($T2-$T1))
echo "[---TIMING LOG---] Trial $COUNT: $DIFFTIME seconds"
LIST="$DIFFTIME $LIST"
COUNT=$(($COUNT+1))
sleep 10
done
local AVGTIME=0
local SDVTIME=0
stats AVGTIME SDVTIME "$LIST"
echo "[---TIMING LOG---] Execution time: $AVGTIME +- $SDVTIME seconds"
return 0
}
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