Added the function ptrColumn(), which returns a pointer to the

top of a column of the matrix.

Cantera/src/Array.h

@@ -179,6 +179,10 @@ namespace Cantera {
         const vector_fp& data() const { return m_data; }
 
 
+	/// Return a pointer to the top of column j, columns are contiguous
+	//  in memory
+	doublereal * ptrColumn(int j) { return &(m_data[m_nrows*j]); }
+
     protected:
 
         vector_fp m_data;