minor fixes

examples/exFit.cpp

@@ -17,14 +17,16 @@ int main(void)
     // generate fake data
     XYStatData          data(nPoint, 1, 1);
     RandGen             rg;
-    double              x_k;
+    double              x_k, y_k;
     CompiledDoubleModel f(1, 2, "return p_1*exp(-x_0*p_0);");
 
     for (Index k = 0; k < nPoint; ++k)
     {
         x_k          = k*dx;
+        y_k          = f(&x_k, exactPar) + rg.gaussian(0.0, 0.1);
+        cout << x_k << " " << y_k << " " << 0.1 << endl;
         data.x(0, k) = x_k;
-        data.y(0, k) = f(&x_k, exactPar) + rg.gaussian(0.0, 0.1);
+        data.y(0, k) = y_k;
     }
     data.yyVar(0, 0).diagonal() = DMat::Constant(nPoint, 1, 0.1*0.1);
     data.assumeXExact(0);
@@ -32,7 +34,7 @@ int main(void)
     // fit
     DVec init = DVec::Constant(2, 0.5);
     FitResult p;
-    MinuitMinimizer minimizer;
+    MinuitMinimizer minimizer(2);
     
     data.fitAllPoints();
     p = data.fit(minimizer, init, f);

examples/exMin.cpp

@@ -18,7 +18,7 @@ int main(int argc, char* argv[])
     source = argv[1];
     
     CompiledDoubleFunction f(1, source);
-    MinuitMinimizer minimizer;
+    MinuitMinimizer minimizer(1);
     double min;
     
     minimizer.setVerbosity(Minimizer::Verbosity::Debug);

examples/exRootFinder.cpp

@@ -11,7 +11,7 @@ int main(void)
     DoubleFunction f1(2, [a](const double *x){return a*(1.-x[0]);});
     DoubleFunction f2(2, [b](const double *x){return b*(x[1]-x[0]*x[0]);});
     vector<DoubleFunction *> system = {&f1, &f2};
-    GslHybridRootFinder solve;
+    GslHybridRootFinder solve(2);
     DVec init(2), x;
     
     solve.setVerbosity(Solver::Verbosity::Debug);

lib/TabFunction.cpp

@@ -68,7 +68,10 @@ double TabFunction::operator()(const double *arg) const
     
     if ((x < value_.begin()->first)||(x >= value_.rbegin()->first))
     {
-        LATAN_ERROR(Range, "tabulated function variable out of range");
+        LATAN_ERROR(Range, "tabulated function variable out of range (x= "
+                    + strFrom(x) + " not in ["
+                    + strFrom(value_.begin()->first) + ", "
+                    + strFrom(value_.rbegin()->first) + "])");
     }
     
     auto i    = value_.equal_range(x);

lib/XYSampleData.hpp

@@ -53,7 +53,7 @@ public:
                                           const Index j = 0) const;
 private:
     DSample                           chi2_;
-    Index                             nDof_{0};
+    double                            nDof_{0.};
     std::vector<DoubleFunctionSample> model_;
 };