1 files changed, 60 insertions, 0 deletions
diff --git a/src/c/CACSD/lqe/dlqea.c b/src/c/CACSD/lqe/dlqea.c
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+++ b/src/c/CACSD/lqe/dlqea.c
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+/* Copyright (C) 2017 - 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 for calculating lqe gain. Refer 'lqe.sci' in scilab source.*/
+
+#include <stdlib.h>
+#include "lqr.h"
+#include "matrixTranspose.h"
+
+void dlqea(double* sys, int sys_rows, int sys_cols, double* X, double* K)
+{
+
+	double *sys_lqr, *K_lqr;
+	int row, col;
+	int sys_lqr_rows = sys_cols-2;
+	int sys_lqr_cols = sys_rows + 2;
+	int no_of_ip, no_of_st;
+
+	no_of_ip = (int)sys[sys_rows*(sys_cols-1)+1];
+	no_of_st = (int)sys[sys_rows*(sys_cols-1)];
+	
+	/*Transpose given system and calculate LQR with new system. Transpose result
+	got from LQR*/
+
+	sys_lqr = (double*) malloc(sys_lqr_rows*sys_lqr_cols*sizeof(double));
+
+	for(col = 0; col<sys_lqr_cols; col++)
+	{
+		for(row = 0; row<sys_lqr_rows; row++)
+		{
+			sys_lqr[col*sys_lqr_rows+row] = sys[row*sys_rows+col];
+
+		}
+	}
+
+	/*Copy initial states and type of system*/
+	for(row = 0; row<sys_lqr_rows; row++)
+	{
+		sys_lqr[sys_lqr_rows*(sys_lqr_cols-2) + row] = sys[sys_rows*(sys_cols-2)+row];
+	}
+
+	/*Copy no of states and no of inputs*/
+	sys_lqr[sys_lqr_rows*(sys_lqr_cols-1)] = no_of_st;
+	sys_lqr[sys_lqr_rows*(sys_lqr_cols-1)+1] = sys_rows - no_of_st;
+
+	/*Calculate LQR gain*/
+	K_lqr = (double*) malloc(no_of_ip*no_of_st*sizeof(double));
+	dlqra(sys_lqr,sys_lqr_rows,sys_lqr_cols,X,K_lqr);
+
+	dtransposea(K_lqr,sys_rows - no_of_st,no_of_st,K);
+}
+\ No newline at end of file