— Function File: c = condeig (a)
— Function File: [v, lambda, c] = condeig (a)

Compute condition numbers of the eigenvalues of a matrix. The condition numbers are the reciprocals of the cosines of the angles between the left and right eigenvectors.

Arguments

• a must be a square numeric matrix.

Return values

• c is a vector of condition numbers of the eigenvalue of a.
• v is the matrix of right eigenvectors of a. The result is the same as for [v, lambda] = eig (a).
• lambda is the diagonal matrix of eigenvalues of a. The result is the same as for [v, lambda] = eig (a).

Example

          a = [1, 2; 3, 4];
          c = condeig (a)
           [1.0150; 1.0150]