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include
osl
stat
variance.h
Go to the documentation of this file.
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/* variance.h
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*/
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#ifndef _VARIANCE_H
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#define _VARIANCE_H
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#include "
osl/stat/average.h
"
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namespace
osl
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{
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namespace
stat
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{
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class
Variance
:
private
Average
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{
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double
m_variance
;
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typedef
Average
base_t
;
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public
:
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// CREATORS
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Variance
() :
m_variance
(0)
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{
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}
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// MANIPULATORS
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void
add
(
const
double
& x)
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{
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const
double
diff =
base_t::add
(x);
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const
double
adjuster
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=
static_cast<
double
>
(
numElements
()-1)/
numElements
();
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m_variance
+= diff*diff*adjuster;
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}
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// ACCESSORS
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double
variance
()
const
{
return
m_variance
/
numElements
(); }
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using
base_t::getAverage
;
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using
base_t::average
;
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using
base_t::numElements
;
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};
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}
// namespace stat
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}
// namespace osl
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#endif
/* _VARIANCE_H */
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// ;;; Local Variables:
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// ;;; mode:c++
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// ;;; c-basic-offset:2
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// ;;; End:
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