Data Analysis, MATLAB Version 7.10 (R2010a)

New features and changes introduced in this version are:

• Operations on Timeseries Objects Sometimes Warn About the isTimeFirst Property

• Time Series Time Vectors Can Now Contain Duplicate Sample Times

Operations on Timeseries Objects Sometimes Warn About the isTimeFirst Property

In a future release, the timeseries Boolean property isTimeFirst will behave differently. If the value is true, this property indicates that the time vector is the first dimension of a time series. If the value is false, the time vector is the last dimension of a time series. In this release, you receive a warning that certain settings of isTimeFirst will not be valid in a future release. The warning indicates that for 3-D or N-D data, time must be the last dimension, while 2-D time series data can have time as the first dimension.

Compatibility Considerations

You can receive a warning when:

• Constructing a time series object with three or more dimensions without specifying a time vector. In a future release, MATLAB will calculate a value of the isTimeFirst property that can differ from the value it currently calculates.

• Changing the data of a time series to data of a different dimensionality. In a future release MATLAB will calculate a value of the isTimeFirst property that differs from the value it currently calculates.

• Directly setting the isTimeFirst property for a time series to a value that will be invalid in a future release.

The warning does not affect how you can use time series data in this release. It is intended to inform you that the behavior of isTimeFirst will change in a future release. If you receive a warning about isTimeFirst, you can use the timeseries method migrateistimefirst to correct the problem. For information type

help timeseries/migrateistimefirst

in the Command Window.

Time Series Time Vectors Can Now Contain Duplicate Sample Times

Starting with this release, a vector containing sample times can have duplicate times in contiguous positions. Previously, time vectors needed to increase monotonically and duplicated time values generated errors. This condition is now relaxed, such that time vectors must be nondecreasing. Interpolation of time series can produce duplicated times if the input to the interpolation method contained duplicate time samples. For more information, see the timeseries reference documentation.

Mathematics, MATLAB Version 7.10 (R2010a)

Programming, MATLAB Version 7.10 (R2010a)

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