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Minuit precsion fix

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This commit is contained in:
Antonin Portelli 2016-04-15 18:23:45 +01:00
parent 0bd347d010
commit 1f7dba7779
1 changed files with 15 additions and 8 deletions
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23
lib/MinuitMinimizer.cpp
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@ -58,9 +58,10 @@ const DVec & MinuitMinimizer::operator()(const DoubleFunction &f)
using namespace ROOT;
using namespace Minuit2;
DVec &x = getState();
int printLevel = 0;
EMinimizerType minuitAlg = kCombined;
DVec &x = getState();
int printLevel = 0;
EMinimizerType minuitAlg = kCombined;
double prec = getPrecision();
// convert Latan parameters to Minuit parameters
switch (getVerbosity())
@ -75,16 +76,21 @@ const DVec & MinuitMinimizer::operator()(const DoubleFunction &f)
printLevel = 3;
break;
}
// The factor of 0.002 here is to compensate the dirty hack in Minuit
// source used to match the C++ and F77 versions
// (cf. VariableMetricBuilder.cxx)
switch (getAlgorithm())
{
case Algorithm::migrad:
minuitAlg = kMigrad;
minuitAlg = kMigrad;
prec /= 0.002;
break;
case Algorithm::simplex:
minuitAlg = kSimplex;
break;
case Algorithm::combined:
minuitAlg = kCombined;
minuitAlg = kCombined;
prec /= 0.002;
break;
}
@ -99,7 +105,7 @@ const DVec & MinuitMinimizer::operator()(const DoubleFunction &f)
min.SetStrategy(2);
min.SetMaxFunctionCalls(getMaxIteration());
min.SetTolerance(getPrecision());
min.SetTolerance(prec);
min.SetPrintLevel(printLevel);
// set function and variables
@ -146,7 +152,7 @@ const DVec & MinuitMinimizer::operator()(const DoubleFunction &f)
min.Minimize();
status = min.Status();
n++;
} while (status and (n < getMaxPass()));
} while ((status >= 2) and (n < getMaxPass()));
if (getVerbosity() >= Verbosity::Normal)
{
cout << "=================================================" << endl;
@ -154,7 +160,8 @@ const DVec & MinuitMinimizer::operator()(const DoubleFunction &f)
switch (status)
{
case 1:
LATAN_WARNING("invalid minimum: covariance matrix was made positive");
// covariance matrix was made positive, the minimum is still good
// it just means that Minuit error analysis is inaccurate
break;
case 2:
LATAN_WARNING("invalid minimum: Hesse analysis is not valid");