From 523afa5a86657bb3a2a44415191bc0ce49e07568 Mon Sep 17 00:00:00 2001
From: Gard Spreemann <gard.spreemann@epfl.ch>
Date: Tue, 10 Oct 2017 15:00:09 +0200
Subject: Save eigenvectors too.

---
 src/main.cpp | 39 ++++++++++++++++++++++-----------------
 1 file changed, 22 insertions(+), 17 deletions(-)

diff --git a/src/main.cpp b/src/main.cpp
index f8904b8..d5a731f 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -10,8 +10,9 @@ int main(int argc, char ** argv)
   SlepcInitialize(&argc, &argv, NULL, NULL);
 
   std::string infile(argv[1]);
-  std::string outfile(argv[2]);
-
+  std::string outfile_vals(argv[2]); 
+  std::string outfile_vecs(argv[3]);
+  
   PetscMPIInt mpi_rank;
   PetscMPIInt mpi_size;
   MPI_Comm_rank(PETSC_COMM_WORLD, &mpi_rank);
@@ -70,10 +71,12 @@ int main(int argc, char ** argv)
   VecScatter scatter;
   err = VecScatterCreateToZero(vec, &scatter, &vec_r0); CHKERRQ(err);
 
-  std::ofstream ofs;
+  std::ofstream ofs_vals;
+  std::ofstream ofs_vecs;
   if (mpi_rank == 0)
   {
-    ofs.open(outfile, std::ios::out);
+    ofs_vals.open(outfile_vals, std::ios::out);
+    ofs_vecs.open(outfile_vecs, std::ios::out);
   }
     
   for (PetscInt i = 0; i < num_ev; i++)
@@ -84,30 +87,32 @@ int main(int argc, char ** argv)
     if (std::abs(val) < cutoff)
     {
       estimated_betti++;
+    }
 
-      err = VecScatterBegin(scatter, vec, vec_r0, INSERT_VALUES, SCATTER_FORWARD); CHKERRQ(err);
-      err = VecScatterEnd(scatter, vec, vec_r0, INSERT_VALUES, SCATTER_FORWARD); CHKERRQ(err);
+    err = VecScatterBegin(scatter, vec, vec_r0, INSERT_VALUES, SCATTER_FORWARD); CHKERRQ(err);
+    err = VecScatterEnd(scatter, vec, vec_r0, INSERT_VALUES, SCATTER_FORWARD); CHKERRQ(err);
 
-      if (mpi_rank == 0)
+    if (mpi_rank == 0)
+    {
+      ofs_vals << val << std::endl;
+      PetscReal * tmp;
+      err = VecGetArray(vec_r0, &tmp); CHKERRQ(err);
+      for (PetscInt j = 0; j < vec_size; j++)
       {
-        PetscReal * tmp;
-        err = VecGetArray(vec_r0, &tmp); CHKERRQ(err);
-        for (PetscInt j = 0; j < vec_size; j++)
-        {
-          ofs << tmp[j] << " ";
-        }
-        ofs << std::endl;
-        err = VecRestoreArray(vec_r0, &tmp); CHKERRQ(err); 
+        ofs_vecs << tmp[j] << " ";
       }
+      ofs_vecs << std::endl;
+      err = VecRestoreArray(vec_r0, &tmp); CHKERRQ(err); 
     }
   }
- 
+  
 
   PetscPrintf(PETSC_COMM_WORLD, "Estimated Betti number: %d.\n", estimated_betti);
 
   if (mpi_rank == 0)
   {
-    ofs.close();
+    ofs_vals.close();
+    ofs_vecs.close();
   }
 
   err = VecScatterDestroy(&scatter); CHKERRQ(err);
-- 
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