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\alias{Arith,its,its-method}
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\title{Arithmetic Methods for Irregular Time-Series Objects}
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Arithmetic methods for objects of class \code{"its"}.
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\item{x,y}{an object of class \code{"its"}}
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The arithmetic operators return numeric vectors containing the result of the
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element-by-element operations. The arguments must be conformable (same dimensions)
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and their time-stamps must match for each row.
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Note that the matrix multiplication operator, %*%, is inherited from matrix,
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and the result of a matrix multiplication is a matrix, not an \code{"its"}.
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The resulting matrix can be converted back to its using the function its()
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The returned object is an object of class \code{"its"}, conformable with the
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inputs, and with identical time-stamps.
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\author{Giles Heywood}
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\code{\link{POSIXct}},
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\code{\link{itsFile}},
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\code{\link{itsTimes}}
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\code{\link{itsSubset}}
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\code{\link{itsCumdif}}
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\code{\link{itsInterp}}
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b <- newIts(1:30,ncol=3)
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its(b\%*\%diag(ncol(b)))