1 /*
   2  * Copyright (c) 2001, 2007, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 # include "incls/_precompiled.incl"
  26 # include "incls/_numberSeq.cpp.incl"



  27 
  28 AbsSeq::AbsSeq(double alpha) :
  29   _num(0), _sum(0.0), _sum_of_squares(0.0),
  30   _davg(0.0), _dvariance(0.0), _alpha(alpha) {
  31 }
  32 
  33 void AbsSeq::add(double val) {
  34   if (_num == 0) {
  35     // if the sequence is empty, the davg is the same as the value
  36     _davg = val;
  37     // and the variance is 0
  38     _dvariance = 0.0;
  39   } else {
  40     // otherwise, calculate both
  41     _davg = (1.0 - _alpha) * val + _alpha * _davg;
  42     double diff = val - _davg;
  43     _dvariance = (1.0 - _alpha) * diff * diff + _alpha * _dvariance;
  44   }
  45 }
  46 

   1 /*
   2  * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "memory/allocation.inline.hpp"
  27 #include "utilities/debug.hpp"
  28 #include "utilities/globalDefinitions.hpp"
  29 #include "utilities/numberSeq.hpp"
  30 
  31 AbsSeq::AbsSeq(double alpha) :
  32   _num(0), _sum(0.0), _sum_of_squares(0.0),
  33   _davg(0.0), _dvariance(0.0), _alpha(alpha) {
  34 }
  35 
  36 void AbsSeq::add(double val) {
  37   if (_num == 0) {
  38     // if the sequence is empty, the davg is the same as the value
  39     _davg = val;
  40     // and the variance is 0
  41     _dvariance = 0.0;
  42   } else {
  43     // otherwise, calculate both
  44     _davg = (1.0 - _alpha) * val + _alpha * _davg;
  45     double diff = val - _davg;
  46     _dvariance = (1.0 - _alpha) * diff * diff + _alpha * _dvariance;
  47   }
  48 }
  49