scidb (version 1.1-2)

diff.scidb: diff

Description

Apply a finite difference operator to a numeric series.

Usage

## S3 method for class 'scidb':
diff(x,lag=1,...)

Arguments

x

A scidb object with a numeric attribute.

lag

An intereger lag value (see description).

...

Optional arguments, not used.

Value

• If 'x' is a vector of length 'n' and starting index 1, then the computed result is equal to the difference 'x[(1+lag):n] - x[1:(n-lag)]'.

  If 'x' is a matrix then the difference operations are carried out on each column separately.

  SciDB missing (NULL) and NaN values propagate.