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31 // MARKER(update_precomp.py): autogen include statement, do not remove
32 #include "precompiled_chart2.hxx"
33 #include "PotentialRegressionCurveCalculator.hxx"
35 #include "RegressionCalculationHelper.hxx"
37 #include <rtl/math.hxx>
38 #include <rtl/ustrbuf.hxx>
40 using namespace ::com::sun::star
;
42 using ::rtl::OUString
;
43 using ::rtl::OUStringBuffer
;
48 PotentialRegressionCurveCalculator::PotentialRegressionCurveCalculator() :
52 ::rtl::math::setNan( & m_fSlope
);
53 ::rtl::math::setNan( & m_fIntercept
);
56 PotentialRegressionCurveCalculator::~PotentialRegressionCurveCalculator()
59 // ____ XRegressionCurveCalculator ____
60 void SAL_CALL
PotentialRegressionCurveCalculator::recalculateRegression(
61 const uno::Sequence
< double >& aXValues
,
62 const uno::Sequence
< double >& aYValues
)
63 throw (uno::RuntimeException
)
65 RegressionCalculationHelper::tDoubleVectorPair
aValues(
66 RegressionCalculationHelper::cleanup(
68 RegressionCalculationHelper::isValidAndBothPositive()));
70 const size_t nMax
= aValues
.first
.size();
73 ::rtl::math::setNan( & m_fSlope
);
74 ::rtl::math::setNan( & m_fIntercept
);
75 ::rtl::math::setNan( & m_fCorrelationCoeffitient
);
79 double fAverageX
= 0.0, fAverageY
= 0.0;
81 for( i
= 0; i
< nMax
; ++i
)
83 fAverageX
+= log( aValues
.first
[i
] );
84 fAverageY
+= log( aValues
.second
[i
] );
87 const double fN
= static_cast< double >( nMax
);
91 double fQx
= 0.0, fQy
= 0.0, fQxy
= 0.0;
92 for( i
= 0; i
< nMax
; ++i
)
94 double fDeltaX
= log( aValues
.first
[i
] ) - fAverageX
;
95 double fDeltaY
= log( aValues
.second
[i
] ) - fAverageY
;
97 fQx
+= fDeltaX
* fDeltaX
;
98 fQy
+= fDeltaY
* fDeltaY
;
99 fQxy
+= fDeltaX
* fDeltaY
;
102 m_fSlope
= fQxy
/ fQx
;
103 m_fIntercept
= fAverageY
- m_fSlope
* fAverageX
;
104 m_fCorrelationCoeffitient
= fQxy
/ sqrt( fQx
* fQy
);
106 m_fIntercept
= exp( m_fIntercept
);
109 double SAL_CALL
PotentialRegressionCurveCalculator::getCurveValue( double x
)
110 throw (lang::IllegalArgumentException
,
111 uno::RuntimeException
)
114 ::rtl::math::setNan( & fResult
);
116 if( ! ( ::rtl::math::isNan( m_fSlope
) ||
117 ::rtl::math::isNan( m_fIntercept
)))
119 fResult
= m_fIntercept
* pow( x
, m_fSlope
);
125 uno::Sequence
< geometry::RealPoint2D
> SAL_CALL
PotentialRegressionCurveCalculator::getCurveValues(
126 double min
, double max
, ::sal_Int32 nPointCount
,
127 const uno::Reference
< chart2::XScaling
>& xScalingX
,
128 const uno::Reference
< chart2::XScaling
>& xScalingY
,
129 ::sal_Bool bMaySkipPointsInCalculation
)
130 throw (lang::IllegalArgumentException
,
131 uno::RuntimeException
)
133 if( bMaySkipPointsInCalculation
&&
134 isLogarithmicScaling( xScalingX
) &&
135 isLogarithmicScaling( xScalingY
))
138 uno::Sequence
< geometry::RealPoint2D
> aResult( 2 );
140 aResult
[0].Y
= this->getCurveValue( min
);
142 aResult
[1].Y
= this->getCurveValue( max
);
146 return RegressionCurveCalculator::getCurveValues( min
, max
, nPointCount
, xScalingX
, xScalingY
, bMaySkipPointsInCalculation
);
149 OUString
PotentialRegressionCurveCalculator::ImplGetRepresentation(
150 const uno::Reference
< util::XNumberFormatter
>& xNumFormatter
,
151 ::sal_Int32 nNumberFormatKey
) const
153 OUStringBuffer
aBuf( C2U( "f(x) = " ));
155 if( m_fIntercept
== 0.0 )
157 aBuf
.append( sal_Unicode( '0' ));
159 else if( m_fSlope
== 0.0 )
161 aBuf
.append( getFormattedString( xNumFormatter
, nNumberFormatKey
, m_fIntercept
));
165 if( ! rtl::math::approxEqual( m_fIntercept
, 1.0 ) )
167 aBuf
.append( getFormattedString( xNumFormatter
, nNumberFormatKey
, m_fIntercept
));
168 aBuf
.append( sal_Unicode( ' ' ));
170 if( m_fSlope
!= 0.0 )
172 aBuf
.appendAscii( RTL_CONSTASCII_STRINGPARAM( "x^" ));
173 aBuf
.append( getFormattedString( xNumFormatter
, nNumberFormatKey
, m_fSlope
));
177 return aBuf
.makeStringAndClear();