Arithmetic Methods for Irregular Time-Series Objects

Description

Arithmetic methods for objects of class "its".

Usage

     x + y
     x - y
     x * y
     x / y
     x ^ y
     x 
     x 

Arguments

Details

The arithmetic operators return numeric vectors containing the result of the element-by-element operations. The arguments must be conformable (same dimensions) and their time-stamps must match for each row.

Note that the matrix multiplication operator, and the result of a matrix multiplication is a matrix, not an "its". The resulting matrix can be converted back to its using the function its() - see examples.

Value

The returned object is an object of class "its", conformable with the inputs, and with identical time-stamps.

Author(s)

Giles Heywood

See Also

ts, POSIXct, itsFile, itsLags itsJoin itsTimes itsSubset itsFin itsDisp itsInfo itsCumdif

Examples

b <- newIts(1:30,ncol=3)
b+b-2*b
b/b
b%*%diag(ncol(b))
its(b%*%diag(ncol(b)))