From b1bf9af98bec797b8efd13166771570ba5974973 Mon Sep 17 00:00:00 2001
From: kai <k.penazzi@web.de>
Date: Sat, 31 May 2025 16:34:17 +0200
Subject: [PATCH] fix gather

---
 lab10/jacobi/jacobi_mpi.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/lab10/jacobi/jacobi_mpi.cpp b/lab10/jacobi/jacobi_mpi.cpp
index 0974cd6..8caa6b3 100644
--- a/lab10/jacobi/jacobi_mpi.cpp
+++ b/lab10/jacobi/jacobi_mpi.cpp
@@ -162,7 +162,11 @@ Jacobi::Result JacobiMPI::run(const Matrix &init, double epsilon,
 
   Matrix result = Matrix::zeros(numProc * numRows, numCols);
 
-  MPI_Gather(&phi[t0], numRows * numCols, MPI_DOUBLE, result.data(),
+  if (rank == 0) {
+    std::cout << "try to gather" << std::endl;
+  }
+
+  MPI_Gather(phi[t0].data(), numRows * numCols, MPI_DOUBLE, result.data(),
              numRows * numCols, MPI_DOUBLE, 0, MPI_COMM_WORLD);
 
   return Jacobi::Result{phi[t0], dist, nIter};