[eigen] Eigen objects as vectors and matrices |

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`I want to an object both as a matrix and as a vector, so I am
``constructing the object using
` Matrix<double, Dynamic, Dynamic> object(m*n, 1);
and then plan to do an
object. conservativeResize(m, n)
before using it as a matrix. The problem is that the bracket operator
object[i]

`does not seem to work when object is a vector (and the software I am
``using access vectors this way).
`
For example, the following source code does not compile:
# include <Eigen/Dense>
int main(void)
{
using Eigen::Matrix;
using Eigen::Dynamic;
typedef Matrix<double, Dynamic, Dynamic> matrix;
matrix v(2,1);
v[0] = 1.0;
v[1] = 2.0;
return 0;
}
~