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Additional info for Understanding Big Data: Analytics for Enterprise Class Hadoop and Streaming Data
Call(). C() first appeared in an earlier version of the R language and is much more restrictive. It only supports pointers to basic C types which is a very severe restriction. Call() interface exclusively. It can operate on the so-called SEXP objects, which stands for pointers to S expression objects. Essentially everything inside R is represented as such a SEXP object, and by permitting exchange of such objects between the C and C++ languages on the one hand, and R on the other hand, programmers have the ability to operate directly on R objects.
More generally, a VAR model consists of a number K of endogenous variable xt . A VAR(p) process is then defined by a series of coefficient matrices A j with j ∈ 1, . . , p such that xt = A1 xt−1 + . . + A pxt−p + ut plus a possible non-time-series regressor matrix which is omitted here. We follow typographic convention of using lowercase letters for scalars, bold lowercase letters for vectors, and uppercase letters for matrices. For the example, we are considering the simplest case of a two-dimensional VAR of order one.
P such that xt = A1 xt−1 + . . + A pxt−p + ut plus a possible non-time-series regressor matrix which is omitted here. We follow typographic convention of using lowercase letters for scalars, bold lowercase letters for vectors, and uppercase letters for matrices. For the example, we are considering the simplest case of a two-dimensional VAR of order one. At time t, it is comprised of two endogenous variables xt = (x1t , x2t ) which are a function of their previous values at t − 1 via a coefficient matrix A.
Understanding Big Data: Analytics for Enterprise Class Hadoop and Streaming Data by Dirk deRoos, Chris Eaton, George Lapis, Paul Zikopoulos, Tom Deutsch