current2cumulative: convert current value to cumulative value
In Nisus-Liu/CompositeIndex: Composite Index

Description Usage Arguments Details Value See Also Examples

sometimes should convert current value to cumulative value if necessity, although using current value is common.

1	current2cumulative(x, cycle = 12, start = 1)

`x`	a numeric vector or a data frame
`cycle`	12 if monthly ; 4 if seasonal ...
`start`	start month or quarter ...

No matter what class of x (vector or data.frame), output value will be a data frame. If x is data frame, progress will convert it's all columns to cumulative value.

A data frame.

cumulative2current

a = c(1:10)
b = c(1,3,6,1,8,4,2,9,10,3)
c = c(rep(c(1,2,3),c(2,3,5)))
df = data.frame(a,b,c)
current2cumulative(df,cycle = 5,start = 1 )
current2cumulative(df,cycle = 5,start = 2 )
current2cumulative(df,cycle = 5,start = 7 ) # fail
current2cumulative(df,cycle = 25 )  # when cycle > nobs.
current2cumulative(df,cycle = 50,50 )