Reduce verbose output for iterations (#79)

Author: mknaranja

README.md

@@ -89,10 +89,10 @@ has been successfully tested for some configurations.
 
 We use `Likwid` for performance monitoring. You can install it using Spack as well:
 
-  **Install Likwid (Performance Monitoring Tool)**:
-    ```bash
-    spack install likwid
-    ```
+**Install Likwid (Performance Monitoring Tool)**:
+```bash
+spack install likwid
+```
 
 ## Running GMGPolar
 

src/GMGPolar/solver.cpp

@@ -39,7 +39,7 @@ void GMGPolar::solve()
     while (number_of_iterations_ < max_iterations_) {
 
         if (verbose_ > 0) {
-            std::cout << "\nIteration: " << number_of_iterations_ << std::endl;
+            std::cout << "\nit: " << number_of_iterations_;
         }
 
         /* ---------------------------------------------- */
@@ -58,8 +58,8 @@ void GMGPolar::solve()
                 std::chrono::duration<double>(end_check_exact_error - start_check_exact_error).count();
 
             if (verbose_ > 0) {
-                std::cout << "Exact Weighted-Euclidean Error: " << exact_error.first << std::endl;
-                std::cout << "Exact Infinity Error: " << exact_error.second << std::endl;
+                std::cout << ", ||u_k-u_ex||_l2: " << exact_error.first;
+                std::cout << ", ||u_k-u_ex||_inf: " << exact_error.second;
             }
         }
         LIKWID_START("Solver");
@@ -98,7 +98,7 @@ void GMGPolar::solve()
                 initial_residual_norm          = current_residual_norm;
                 current_relative_residual_norm = 1.0;
                 if (verbose_ > 0) {
-                    std::cout << "Residual Norm: " << current_residual_norm << std::endl;
+                    std::cout << ", ||r_k||: " << current_residual_norm;
                 }
             }
             else {
@@ -107,9 +107,9 @@ void GMGPolar::solve()
                     residual_norms_[number_of_iterations_] / residual_norms_[number_of_iterations_ - 1];
 
                 if (verbose_ > 0) {
-                    std::cout << "Residual Norm: " << current_residual_norm << std::endl;
-                    std::cout << "Relative Residual Norm: " << current_relative_residual_norm << std::endl;
-                    std::cout << "Residual Reduction Factor: " << current_residual_reduction_factor << std::endl;
+                    std::cout << ", ||r_k||: " << current_residual_norm;
+                    std::cout << ", ||r_k|| / ||r_0||: " << current_relative_residual_norm;
+                    std::cout << ", ||r_k|| / ||r_{k-1}||: " << current_residual_reduction_factor;
                 }
 
                 const double convergence_factor = 0.7;