# unwrap

## Purpose

Correct phase angles.

## Synopsis

    Q = unwrap(P,cutoff)
    Q = unwrap(P)

## Description

`Q = unwrap(P,cutoff)` corrects the phase angles in vector or matrix `P` by adding multiples of ±2¶, when absolute jumps are greater than `cutoff`, to smooth the transitions across branch cuts. When `P` is a matrix, the phase angles are corrected down each column. The phase must be in radians.

`Q` `=` `unwrap(P)` uses the default value for `cutoff`, pi .

## Limitations

`unwrap` does the best it can to detect branch cut crossings, but it can be fooled by sparse, rapidly changing phase values.

## See Also

    abs, angle

(c) Copyright 1994 by The MathWorks, Inc.