From 785d4a385c1d0f77293078ad5358c37ccf5c3322 Mon Sep 17 00:00:00 2001
From: Jolllly <jolllly@foxmail.com>
Date: Wed, 10 Nov 2021 23:04:03 +0800
Subject: [PATCH] =?UTF-8?q?=E8=A1=A5=E5=85=A8MPI=E7=9F=A9=E9=98=B5?=
 =?UTF-8?q?=E4=B9=98=E7=A8=8B=E5=BA=8F=E7=BB=93=E5=B0=BE=E4=BB=A3=E7=A0=81?=
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---
 20-parallel-programming.Rmd | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/20-parallel-programming.Rmd b/20-parallel-programming.Rmd
index a406c86..3b83804 100644
--- a/20-parallel-programming.Rmd
+++ b/20-parallel-programming.Rmd
@@ -777,6 +777,21 @@ int main(int argc, char **argv)
                 C[i*n+j]=0;
                 for(k=0;k<n;k++)
                     C[i*n+j]+=A[i*n+k]*B[k*n+j];
+            }
+    } else {
+        //其他进程接收数据，计算结果，发送给主进程
+        MPI_Recv(B,n*n,MPI_DOUBLE,0,0,MPI_COMM_WORLD,&status);
+        MPI_Recv(A+(ID-1)*line*n,line*n,MPI_DOUBLE,0,1,MPI_COMM_WORLD,&status);
+        for(i=(ID-1)*line;i<ID*line;i++)
+            for(j=0;j<n;j++) {
+                C[i*n+j]=0;
+                for(k=0;k<n;k++)
+                    C[i*n+j]+=A[i*n+k]*B[k*n+j];
+            }
+        MPI_SEND(C+(num_procs-1)*line*n,line*n,MPI_DOUBLE,0,2,MPI_COMM_WORLD);
+    }
+    MPI_Finalize();
+    return 0;
 }
 ```