zeroCross: Find the Zero Crossing of a Time Series
In zeehio/msProcess: Protein Mass Spectra Processing

Description Usage Arguments See Also Examples

Finds positive-negative of negative-positive zero crossings of the input time series.

1	zeroCross(x, slope="positive")

`x`	a numeric vector representing a time series.
`slope`	a character string defining the typeo of zero-crossings to find: specifying a `"negative"` slope identifies all positive- to negative-valued zero-crossings, while a `"positive"` slope identifies all negative- to positive-valued zero crossings. Default: `"positive"`.

msExtrema.

x <- sin(seq(0,10,length=1000))
pos <- zeroCross(x, "positive")
neg <- zeroCross(x, "negative")
plot(x, cex=0.5, type="b")
abline(v=pos, col="red", lty="solid")
abline(v=neg, col="blue", lty="dashed")