toDOY {spphpr}R Documentation

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 mathes with the year vector and the mean daily temperature vector as arguments in other functions, e.g., the ADD function.

Author(s)

Peijian Shi pjshi@njfu.edu.cn, Zhenghong Chen chenzh64@126.com, Brady K. Quinn Brady.Quinn@dfo-mpo.gc.ca.

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. 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. doi:10.1093/aesa/sax063

See Also

BJMDT

Examples


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


[Package spphpr version 0.1.4 Index]