new constructor from vector

cpp/Matrix.h

@@ -37,6 +37,11 @@ Matrix Matrix_( size_t m, size_t n, const double* const data);
  */
 Matrix Matrix_(size_t m, size_t n, const Vector& v);
 
+/**
+ *  constructor from Vector yielding v.size()*1 vector
+ */
+inline Matrix Matrix_(const Vector& v) { return Matrix_(v.size(),1,v);}
+
 /**
  *  nice constructor, dangerous as number of arguments must be exactly right
  *  and you have to pass doubles !!! always use 0.0 never 0