Rank of the correction

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The command cqtrank returns the rank of the top-left correction in the QT matrix; for matrices of finite size, the rank of the bottom right correction is returned as a second output.

Contents

Syntax

Example

The rank of the correction in the inverse of a tridiagonal Toeplitz matrices is at most one.

A = inv(cqt([3 1], [3 1]));
rk = cqtrank(A)

rk =

     1