1 files changed, 56 insertions, 0 deletions
diff --git a/src/c/statisticsFunctions/correl/dcorrelfres.c b/src/c/statisticsFunctions/correl/dcorrelfres.c
new file mode 100644
index 00000000..7d4c718a
--- /dev/null
+++ b/src/c/statisticsFunctions/correl/dcorrelfres.c
@@ -0,0 +1,56 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <ones.h>
+#include "addition.h"
+#include "subtraction.h"
+#include "multiplication.h"
+#include "division.h"
+#include "sqrt.h"
+#include "sum.h"
+#include "correl.h"
+#include "matrix.h"
+#include "mean.h"
+
+double dcorrelfres (double* inp1, int sr1, int sc1, double* inp2, int sr2, int sc2, double* inp3, int sr3, int sc3)
+{
+    double p1[sr3], p2[sc3], m1 = 0, m2 = 0,  s1 = 0, s2 = 0, s3 = 0, diff1[sr1*sc1], diff2[sr2*sc2], sum = 0, prod[sr3];
+
+    double fr[sr3*sc3];
+
+    for(int i = 0; i < sr3*sc3; i++)
+	s3 += inp3[i];
+
+    for(int i = 0; i < sr3*sc3; i++)
+	fr[i] = inp3[i]/s3;
+
+
+
+    dcolumnsuma(fr, sr3, sc3, p1);
+    drowsuma(fr, sr3, sc3, p2);
+
+
+
+    m1 = dmulv(inp1, p1, sr3);
+    m2 = dmulv(inp2, p2, sc3);
+
+    for(int i = 0; i < sr1*sc1; i++)
+	diff1[i] = pow(inp1[i] - m1, 2);
+
+    for(int i = 0; i < sr2*sc2; i++)
+	diff2[i] = pow(inp2[i] - m2, 2);
+
+
+    s1 = dsqrts(dmulv(diff1, p1, sr3));
+    s2 = dsqrts(dmulv(p2, diff2, sc3));
+
+    for(int i = 0; i < sr1*sc1; i++)
+	diff1[i] = inp1[i] - m1;
+
+    for(int i = 0; i < sr2*sc2; i++)
+	diff2[i] = inp2[i] - m2;
+
+    dmulma(fr, sr3, sc3, diff2, sc2, 1, prod);
+
+    return dmulv(diff1, prod, sr3)/(s1*s2);
+}