R: Cross Correlation

xcor2 {RSEIS} | R Documentation

## Cross Correlation

### Description

Cross correlation of two signals

### Usage

    xcor2(a1, a2, DT, PLOT = FALSE, LAG = 100)

### Arguments

`a1` | input signal 1
`a2` | input signal 1
`DT` | deltaT in seconds
`PLOT` | logical TRUE=plot
`LAG` | time lag for correlation function

### Details

Illustrates the cross correlation of two time series.

### Value

`ccf` | Return list from function ccf
`mlag` | maximum lag in time
`mccx` | value of ccf at max lag mlag
`mlag2` | maximum absolute value lag
`mccx2` | value of ccf at mlag2

### Author(s)

Jonathan M. Lees<jonathan.lees.edu>

### See Also

ccf

### Examples

    data(CE1)

    ts1 <- CE1$y[CE1$x>5.443754 & CE1$x<5.615951]

    ts2 <- CE1$y[CE1$x>5.760959]
    ts2 <- ts2[1:length(ts1)]

    ts1 <- ts1-mean(ts1)
    ts2 <- ts2-mean(ts2)

    xc <- xcor2(ts1, ts2, CE1$dt , PLOT = TRUE)

[Package RSEIS version 3.7-4 Index]