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Resolves: #i95167# XIRR() function gives Err:502

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Patch by: Driss Ben Zoubeir <driss.zoubeir@gmail.com>
Review by: Regina Henschel <rb.henschel@t-online.de>
(cherry picked from commit 85cd072198d9024c20b741c04a20ef99fc9b5910)

Conflicts:
	scaddins/source/analysis/financial.cxx

Change-Id: I385d5f9bfa840fe609cb5723f2d4d57d26fd0d6c
This commit is contained in:
Regina Henschel 2015-04-06 15:51:04 +00:00 committed by Caolán McNamara
parent 4d48b51ad4
commit 9f1ffa641b
1 changed files with 28 additions and 7 deletions
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35
scaddins/source/analysis/financial.cxx
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@ -541,16 +541,37 @@ double SAL_CALL AnalysisAddIn::getXirr(
// Newton's method - try to find a fResultRate, so that lcl_sca_XirrResult() returns 0.
sal_Int32 nIter = 0;
bool bContLoop;
double fResultValue;
sal_Int32 nIterScan = 0;
bool bContLoop = false;
bool bResultRateScanEnd = false;
// First the inner while-loop will be executed using the default Value fResultRate
// or the user guessed fResultRate if those do not deliver a solution for the
// Newton's method then the range from -0.99 to +0.99 will be scanned with a
// step size of 0.01 to find fResultRate's value which can deliver a solution
do
{
double fResultValue = lcl_sca_XirrResult( aValues, aDates, fResultRate );
double fNewRate = fResultRate - fResultValue / lcl_sca_XirrResult_Deriv1( aValues, aDates, fResultRate );
double fRateEps = fabs( fNewRate - fResultRate );
fResultRate = fNewRate;
bContLoop = (fRateEps > fMaxEps) && (fabs( fResultValue ) > fMaxEps);
if (nIterScan >=1)
fResultRate = -0.99 + (nIterScan -1)* 0.01;
do
{
fResultValue = lcl_sca_XirrResult( aValues, aDates, fResultRate );
double fNewRate = fResultRate - fResultValue / lcl_sca_XirrResult_Deriv1( aValues, aDates, fResultRate );
double fRateEps = fabs( fNewRate - fResultRate );
fResultRate = fNewRate;
bContLoop = (fRateEps > fMaxEps) && (fabs( fResultValue ) > fMaxEps);
}
while( bContLoop && (++nIter < nMaxIter) );
nIter = 0;
if ( ::rtl::math::isNan(fResultRate) || ::rtl::math::isInf(fResultRate)
||::rtl::math::isNan(fResultValue) || ::rtl::math::isInf(fResultValue))
bContLoop = true;
++nIterScan;
bResultRateScanEnd = (nIterScan >= 200);
}
while( bContLoop && (++nIter < nMaxIter) );
while(bContLoop && !bResultRateScanEnd);
if( bContLoop )
throw css::lang::IllegalArgumentException();