MeqMatrix22

A MeqMatrix22 node creates a 2x2 matrix. It is really an alias for the MeqComposer node. The important thing to be aware of about this node is that you must enter the four children of the matrix in row-major order. e.g. if we have a matrix

b = 1 2
    3 4

then we would create a corresponding MeqMatrix22 node with

ns.a << MeqMatrix22(1,2,3,4)

Most of the error terms associated with the Measurement Equation end up as the upper right and lower left diagonal values of a 2x2 matrix so it pays to be aware of where these terms end up in the MeqMatrix22 node.