System Identification Toolbox™

resample - Resample time-domain data by decimation or interpolation (requires Signal Processing Toolbox software)

Syntax

resample(data,P,Q)
resample(data,P,Q,order)

Description

resample(data,P,Q) resamples data such that the data is interpolated by a factor P and then decimated by a factor Q. resample(z,1,Q) results in decimation by a factor Q.

resample(data,P,Q,order) filters the data by applying a filter of specified order before interpolation and decimation.

Input

data

Name of time-domain iddata object. Can be input-output or time-series data.

Data must be sampled at equal time intervals.

P, Q

Integers that specify the resampling factor, such that the new sampling interval is Q/P times the original one.

(Q/P)>1 results in decimation and (Q/P)<1 results in interpolation.

order

Order of the filters applied before interpolation and decimation.

Default: 10

Algorithm

If you have installed the Signal Processing Toolbox software, resample calls the Signal Processing Toolbox resample function. The algorithm takes into account the intersample characteristics of the input signal, as described by data.InterSample.

Examples

In this example, you increase the sampling rate by a factor of 1.5 and compare the resampled and the original data signals.

plot(u)
ur = resample(u,3,2);
plot(u,ur)

See Also

idresamp

realdata

resid