Nothing
intensity.function <- function( summer.rate = 0, winter.rate = 1, flu = TRUE ){
if( summer.rate < 0 || summer.rate > 1 ) stop( "summer.rate must be value between 0 and 1" )
if( winter.rate < 0 || winter.rate > 1 ) stop( "winter.rate must be value between 0 and 1" )
if( flu ){
intensity <- function(t)
{
intens <- numeric( length(t) )
intens[ t <= pi/6 ] <- winter.rate
a <- ( t - pi/6 )/( pi/12 )
b <- floor(a) %% 12
intens[ ( b < 4 ) & t > pi/6 ] <- summer.rate
intens[ ( b >= 4 ) & t > pi/6 ] <- winter.rate
return(intens)
}
}else{
intensity <- function(t)
{
return( rep( winter.rate, length(t) ) )
}
}
return( intensity )
}
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