From c6356c0c760cff97ecc0acfb40949d6e796d8999 Mon Sep 17 00:00:00 2001
From: Jiri Pittner <jiri@pittnerovi.com>
Date: Thu, 3 Feb 2022 11:04:55 +0100
Subject: [PATCH] test of permuted_rows

---
 t.cc | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/t.cc b/t.cc
index 7a86beb..e83d40d 100644
--- a/t.cc
+++ b/t.cc
@@ -2388,7 +2388,7 @@ cout <<"det error="<<d-dd<<endl;
 cout <<"solution error="<<(r-rr).norm()<<endl;
 }
 
-if(1)
+if(0)
 {
 //prepare random  mat3
 int seed;
@@ -2413,4 +2413,21 @@ double det = fit.solve();
 cout <<"det= "<<det<<" fit "<<fit<<endl;
 }
 
+if(1)
+{
+NRMat<double> m;
+cin >>m;
+int n=m.nrows();
+int seed;
+int f=open("/dev/random",O_RDONLY);
+if(sizeof(int)!=read(f,&seed,sizeof(int))) laerror("cannot read /dev/random");
+close(f);
+srand(seed);
+NRPerm<int> p(n);
+p.randomize();
+cout <<p;
+NRMat<double> mm=m.permuted_rows(p);
+cout <<mm;
+}
+
 }