How modulus works with negative integers in R:
-90 %% 360
90 %% -360
-400 %% 360
400 %% -360
outputs:
270
-270
320
-320
what is the rationale behind this?
The answer from @JimSlonder:
a <- c(-90,90,-400,400)
b <- c(360,-360,360,-360)
modulus <- function(a,b)
a-floor(a/b)*b
all("%%"(a,b) == modulus(a,b))
