pjs/tools/footprint/linear-regression.awk

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2.5 KiB
Awk
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2000-11-14 02:36:59 +03:00
# The contents of this file are subject to the Mozilla Public
# License Version 1.1 (the "License"); you may not use this file
# except in compliance with the License. You may obtain a copy of
# the License at http://www.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS
# IS" basis, WITHOUT WARRANTY OF ANY KIND, either express oqr
# implied. See the License for the specific language governing
# rights and limitations under the License.
#
# The Original Code is linear-regression.awk, released November 13, 2000.
#
# The Initial Developer of the Original Code is Netscape
# Communications Corporation. Portions created by Netscape are
# Copyright (C) 2000 Netscape Communications Corporation. All
# Rights Reserved.
#
# Contributor(s):
# Chris Waterson <waterson@netscape.com>
#
# Alternatively, the contents of this file may be used under the
# terms of the GNU Public License (the "GPL"), in which case the
# provisions of the GPL are applicable instead of those above.
# If you wish to allow use of your version of this file only
# under the terms of the GPL and not to allow others to use your
# version of this file under the MPL, indicate your decision by
# deleting the provisions above and replace them with the notice
# and other provisions required by the GPL. If you do not delete
# the provisions above, a recipient may use your version of this
# file under either the MPL or the GPL.
#
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;
}
}
}
2000-11-14 02:36:59 +03:00
END {
if(Interval) {
print NR-Count, "-", NR, ": ", regress(Count,isx,isy,isxy,isx2);
}
print regress(NR-Skip, sx, sy, sxy, sx2);
}