block_mean {tagtools}

Compute mean of sample blocks

Description

This function is used to compute the means of successive blocks of samples.

Usage

block_mean(X, n, nov)

Arguments

X

A vector or a matrix containing samples of a signal in each column.

n

The number of samples from X to use in each analysis block.

nov

(optional) The number of samples that the next block overlaps the previous block. The default value is 0.

Value

A list with 2 elements:

• Y: A vector or matrix containing the mean value of each block. If X is a mxn matrix, Y is pxn where p is the number of complete n-length blocks with nov that can be made out of m samples, i.e., n+(p-1)*(n-nov) < m

• samples: The time at which each output in Y is reported, in units of samples of X. So if samples[1] = 12, then the value Y[1] corresponds to the “time” 12 samples in X.

Examples

samplematrix <- matrix(c(1, 3, 5, 7, 9, 11, 13, 15, 17), byrow = TRUE, ncol = 3)
list <- block_mean(samplematrix, n = 3, nov = 1)