MATLAB COMPILER RELEASE NOTES User's Guide download pdf (Page 334)

100

101

R2010a

13-16

Data Analysis

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

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MATLAB COMPILER RELEASE NOTES User's Guide Page 334

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