Description Usage Arguments Details Value Author(s) References Examples
Calculate the radial angle for each horizontal and vertical component vector pair.
1 | vec_ang(vx, vy)
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vx |
A numeric vector of 1 or more values representing
horizontal components of Euclidean vectors. |
vy |
A numeric vector of 1 or more values representing vertical
components of Euclidean vectors. |
vec_ang returns the angle corresponding to the horizontal (vx) and vertical vector components (vy) according to:
atan2(vy, vx) + π
Returns the polar coordinate angle corresponding to each horizontal and vertical component vector pair.
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 | 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
rv_ang <- vec_ang(vx,vy) # Angle of resultant vec (point of max activity)
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