arrow: Plot an arrow
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Plot an arrow

Description

It plots a polygon arrow subject to criteria concerning position, length, width, direction and color.

In plots of the cross-wavelet power (or wavelet coherency) spectrum of two time series as performed by function wc.image, arrows are used as a symbolic indicator of phase differences between the series in the time/frequency domain.

This code has been developed by Huidong Tian (archived R package WaveletCo).

Usage

arrow(x, y, l = 0.1, w = 0.3*l, alpha, col.arrow = "black")

Arguments

`x`	the x coordinate of the center of the arrow
`y`	the y coordinate of the center of the arrow
`l`	the length of the arrow. Default: `0.1`.
`w`	the width of the arrow. Default: `0.3*l`.
`alpha`	the direction of the arrow, ranging from `0` to `2*pi`
`col.arrow`	color of the arrow. Default: `"black"`.

Author(s)

Code developed by Huidong Tian.

References

Tian, H., and Cazelles, B., 2012. WaveletCo. Available at https://cran.r-project.org/src/contrib/Archive/WaveletCo/, archived April 2013; accessed July 26, 2013.

WaveletComp documentation built on June 8, 2025, 10:34 a.m.