Description Usage Arguments Details Value Author(s) References Examples
Calculate the vertical opposite of the input radian value(s).
1 | avec_ang(r)
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r |
A numeric vector of values of radial coordinates. |
avec_ang returns the vertical opposite(s) of the input angles.
Returns the vertical opposite of radial angle(s).
Bjorn J. Brooks, Danny C. Lee, William W. Hargrove, Lars Y. Pomara
Brooks, B.J., Lee, D.C., Desai, A.R., Pomara, L.Y., Hargrove, W.W. (2017). Quantifying seasonal patterns in disparate environmental variables using the PolarMetrics R package.
1 2 3 4 5 6 7 8 9 10 | dpy <- 365 # Days/yr
data(mndvi) # Load data
t <- as.vector(mndvi$day) # Days since January 1, 2000
r <- t2rad(t,dpy) # Transform days of year to radians
v <- as.vector(mndvi$wc) # MODIS NDVI for Willow Creek tower, WI
vx <- mean(vec.x(r,v), na.rm=TRUE) # Avg horizontal vector
vy <- mean(vec.y(r,v), na.rm=TRUE) # Avg vertical vector
vm <- vec_mag(vx,vy) # Magnitude of average vector
rv_ang <- vec_ang(vx,vy) # Angle of resultant vec (point of max activity)
av_ang <- avec_ang(rv_ang) # Angle marking point of least activity
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