Documentation |
ts_std = std(ts)
ts_std = std(ts,Name,Value)
ts_std = std(ts) returns the standard deviation of the timeseries data.
ts_std = std(ts,Name,Value) specifies additional options specified with one or more Name,Value pair arguments.
ts |
The timeseries object for which you want the standard deviation of the data. |
Specify optional comma-separated pairs of Name,Value arguments. Name is the argument name and Value is the corresponding value. Name must appear inside single quotes (' '). You can specify several name and value pair arguments in any order as Name1,Value1,...,NameN,ValueN.
The following example finds the standard deviation for a timeseries object. MATLAB^{®} calculates the standard deviation for each data column in the timeseries object.
% Load a 24-by-3 data array: load count.dat % Create a timeseries object with 24 time values: count_ts = timeseries(count,1:24,'Name','CountPerSecond'); % Calculate the standard deviation of each data column for this % timeseries object: std(count_ts)
MATLAB returns:
25.3703 41.4057 68.0281
MATLAB determines weighting by:
Attaching a weighting to each time value, depending on its order, as follows:
First time point — The duration of the first time interval (t(2) - t(1)).
Time point that is neither the first nor last time point — The duration between the midpoint of the previous time interval to the midpoint of the subsequent time interval ((t(k + 1) - t(k))/2 + (t(k) - t(k - 1))/2).
Last time point — The duration of the last time interval ((t(end) - t(end - 1)).
Normalizing the weighting for each time by dividing each weighting by the mean of all weightings.
Multiplying the data for each time by its normalized weighting.