From 277d1edfa17bf3719d90ddbac8e31f6181e952c3 Mon Sep 17 00:00:00 2001
From: Sandeep Gupta
Date: Sun, 18 Jun 2017 23:55:40 +0530
Subject: First commit

---
 src/c/matrixOperations/triu/dtriua.c | 35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)
 create mode 100644 src/c/matrixOperations/triu/dtriua.c

(limited to 'src/c/matrixOperations/triu/dtriua.c')

diff --git a/src/c/matrixOperations/triu/dtriua.c b/src/c/matrixOperations/triu/dtriua.c
new file mode 100644
index 0000000..80db14b
--- /dev/null
+++ b/src/c/matrixOperations/triu/dtriua.c
@@ -0,0 +1,35 @@
+/* Copyright (C) 2016 - IIT Bombay - FOSSEE
+
+ This file must be used under the terms of the CeCILL.
+ This source file is licensed as described in the file COPYING, which
+ you should have received as part of this distribution.  The terms
+ are also available at
+ http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
+ Author: Siddhesh Wani
+ Organization: FOSSEE, IIT Bombay
+ Email: toolbox@scilab.in
+*/
+ 
+/*Function to extract lower triagular entries from given matrix*/
+ 
+#include "triu.h"
+
+void dtriua (double *in, int row, int column, double diag, double *out)
+{
+	int row_counter, col_counter = 0;
+
+	for(row_counter=0; row_counter < row; row_counter++)
+	{
+		for(col_counter=0; col_counter < column; col_counter++)
+		{
+			if((double)(row_counter + diag) <= (double)col_counter)
+			{
+				out[col_counter*row+row_counter] = in[col_counter*row+row_counter];
+			}
+			else
+			{
+				out[col_counter*row+row_counter] = 0;	
+			}
+		}
+	}
+}
\ No newline at end of file
-- 
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