fix Makefile #2

exercises/ex04_solution/heised_cpp/Makefile

-ALPSDIR = /opt/alps/include/
+# pick your directory
+#ALPSDIR = /opt/alps/include/
+ALPSDIR = alps-2.2.b4-src-with-boost
 
 CXX = g++
 CPPFLAGS = -std=c++14 -I${ALPSDIR} -I${ALPSDIR}/boost -I${ALPSDIR}/alps/src

exercises/ex04_solution/heised_cpp/heised.cpp

@@ -36,12 +36,12 @@ private:
 };
 
 SpinHalfBasis::SpinHalfBasis(unsigned l, unsigned nups) // l: chain length; nups: spins-ups (fixes the symmetry sector).
-:   index_(State(1<<l), NOT_FOUND) // initialize index_ to have 2^l entries each of which is the NOT_FOUND flag.  
+:   index_(State(1<<l), NOT_FOUND) // initialize index_ to have 2^l entries each of which is the NOT_FOUND flag.
 {
     // find all states with [nups] up spins
     for( State s = 0; s < index_.size(); ++s )
     {
-        if( alps::popcnt(s) == nups ) // if the state is in this sector keep it.  
+        if( alps::popcnt(s) == nups ) // if the state is in this sector keep it.
         {
             index_[s] = states_.size();
             states_.push_back(s);
@@ -144,7 +144,7 @@ diagonalize( const HeisenbergHamiltonian& h, unsigned nvals=1, unsigned maxiter=
     Vectorspace vspace(h.dimension());
     Lanczos solver(h,vspace);
     Iteration iter(maxiter,nvals);
-    
+
     solver.calculate_eigenvalues(iter,Generator()); // call the solver for the eigenvalues.
 
     if( iter.iterations() == maxiter )
@@ -197,8 +197,8 @@ void write_dat_header(std::ostream& datfile,unsigned nstates)
 
 int main()
 {
-    int lmin = 2;
-    int lmax = 20;
+    int lmin = 5;
+    int lmax = 5;
     double j = 1.;
     unsigned nstates = 2; // How many of the lowest eigenvalues (energies) do you want to calculate? ( nstates = 1 ... just the ground state)