Name

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UNWRAP

Purpose

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This function unwraps angular time series such that is it continuous.

Category

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Time series analysis

Calling Sequence

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Result = UNWRAP( X )

Inputs

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X: A vector of type floating point containing angular information

Keyword Parameters

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-

Outputs

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Result: The unwrapped version of X.

Uses

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CONSTANTS.pro

Procedure

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This function iteratively unwraps the angular values.

Example

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Create an incremental vector of angles.
a = 2. * !pi * findgen( 1000 ) / 100.
Convert this to Cartesian coordinates, then back to polar coordinates.
        ang = atan( sin( a ), cos( a ) )
Unwrap the values in ANG.
b = unwrap( ang )
B should be identical to A, while ANG will have discontinuities and be
restricted to the +/-pi interval.

References

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Modification History

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Written by: Daithi A. Stone (stoned@atm.ox.ac.uk), 2004-10-25