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diff --git a/src/cblas_idamax.c b/src/cblas_idamax.c
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+/*
+ * cblas_idamax.c
+ *
+ * The program is a C interface to idamax.
+ * It calls the fortran wrapper before calling idamax.
+ *
+ * Written by Keita Teranishi. 2/11/1998
+ *
+ */
+#include "cblas.h"
+#include "cblas_f77.h"
+CBLAS_INDEX cblas_idamax( const int N, const double *X, const int incX)
+{
+ int iamax;
+#ifdef F77_INT
+ F77_INT F77_N=N, F77_incX=incX;
+#else
+ #define F77_N N
+ #define F77_incX incX
+#endif
+ iamax = F77_idamax( &F77_N, X, &F77_incX);
+ return iamax ? iamax-1 : 0;
+}