resample: Resamples a data set
In tunelipt/wutils: Useful functions for data processing in a wind tunnel

Description Usage Arguments Details Value Examples

This function uses trigonometric interpolation to resample a time series.

1	resample(x, m)

`x`	Vector or matrix of data to be resampled.
`m`	Number of additional points to be added.

Sometimes it is interesting to resample a time series so that a greater resolution is available. This function uses trigonometric interpolation to resample the time series. The parameter m is the number of additional points that will be added to the signal. The function also works on arrays of data where each column represents a time series.

Resampled data. If a ts object was used, a new object with the resampled frequency is returned.

x <- seq(0, 1, len=11)
y <- ts(sin(2*pi*x)[1:10], start=0, deltat=x[2]-x[1])
y2 <- resample(y, 30)
x1 <- seq(0, 1, len=201)
y1 <- sin(2*pi*x1)
plot(x1, y1, xlab="Time", ylab=expression(sin(2*pi*t)), ty='l')
points(y, ty='p')
points(y2, pch=3, col=3)
legend("topright", c(expression(sin(2*pi*t)), "Original signal", "Resampled signal"), pch=c(-1, 1,3), col=c(1, 1,3), lty=c(1, -1,-1))