gecko-dev/tools/footprint/linear-regression.awk
2012-05-21 12:12:37 +01:00

59 lines
1.3 KiB
Awk
Executable File

# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
function regress(DATAPOINTS,SX,SY,SXY,SX2)
{
b1 = (DATAPOINTS * SXY - SX * SY) / (DATAPOINTS * SX2 - SX * SX);
b0 = (SY - b1 * SX ) / DATAPOINTS;
return b1 " * x + " b0;
}
BEGIN {
if (!Skip) Skip = 0;
if (Interval)
{
Count = 0;
IntervalCount = 0;
}
}
NR>Skip {
sx += $1;
sy += $2;
sxy += $1 * $2;
sx2 += $1 * $1;
#print NR " " sx " " sy " " sxy " " sx2
if (Interval)
{
if(Count == Interval-1)
{
IntervalCount += 1;
print NR-Count, "-", NR, ": ", regress(Count,isx,isy,isxy,isx2);
Count = 0;
isx = 0;
isy = 0;
isxy = 0;
isx2 = 0;
}
else
{
Count += 1;
isx += $1;
isy += $2;
isxy += $1 * $2;
isx2 += $1 * $1;
}
}
}
END {
if(Interval) {
print NR-Count, "-", NR, ": ", regress(Count,isx,isy,isxy,isx2);
}
print regress(NR-Skip, sx, sy, sxy, sx2);
}