Symbol of a QT matrix

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The command symbol returns the coefficients of the Laurent polynomial that approximates the symbol of a QT matrix.

The correction part can be obtained with the correction command.

Contents

Syntax

Example

The two vectors returned by the symbol command contain the negative and positive coefficients of the Laurent polynomial for the Toeplitz part of $A$.

A = cqt([ 1 2 3 ], [ 1 4 5 ]);
[am, ap] = symbol(A)

am =

     1     2     3


ap =

     1     4     5