toDOY: Function for Transferring a Date to the Value of Day-of-Year

In spphpr: Spring Phenological Prediction

Function for Transferring a Date to the Value of Day-of-Year

Description

Transfers the date (from year, month and day) to the value of day-of-year.

Usage

toDOY(Year, Month, Day)

Arguments

Year	the vector of years
Month	the vector of months
Day	the vector of days

Details

The user needs to provide the three separate vectors of Year, Month and Day, rather than providing a single date vector. The arguments can be numerical vectors or character vectors.

Value

The returned value is a vector of transferred dates in day-of-year.

Note

The returned vector, DOY, usually matches with the year vector and the mean daily temperature vector as arguments in other functions, e.g., the ADD function.

Author(s)

Peijian Shi [e-mail], Zhenghong Chen [e-mail], Jing Tan [e-mail], Brady K. Quinn [e-mail].

References

Shi, P., Chen, Z., Reddy, G.V.P., Hui, C., Huang, J., Xiao, M. (2017a) Timing of cherry tree blooming: Contrasting effects of rising winter low temperatures and early spring temperatures. Agricultural and Forest Meteorology 240-241, 78-89. \Sexpr[results=rd]{tools:::Rd_expr_doi("10.1016/j.agrformet.2017.04.001")}

Shi, P., Fan, M., Reddy, G.V.P. (2017b) Comparison of thermal performance equations in describing temperature-dependent developmental rates of insects: (III) Phenological applications. Annals of the Entomological Society of America 110, 558-564. \Sexpr[results=rd]{tools:::Rd_expr_doi("10.1093/aesa/sax063")}

See Also

BJDAT

Examples

data(BJDAT)
X2   <- BJDAT
DOY2 <- toDOY(X2$Year, X2$Month, X2$Day)
# cbind(X2$DOY, DOY2)

spphpr documentation built on April 11, 2025, 6:11 p.m.