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Finds the indicator matrix of the zeros of a matrix.
In(A)
a matrix of the same dimensions as A
.
a matrix.
Giovanni M. Marchetti
The indicator matrix is a matrix of zeros and ones which has a zero
element iff the corresponding element of A
is (exactly) zero.
Wermuth, N. \& Cox, D.R. (2004). Joint response graphs and separation induced by triangular systems. J.R. Statist. Soc. B, 66, Part 3, 687-717.
DAG
, inducedCovGraph
, inducedConGraph
## A simple way to find the overall induced concentration graph
## The DAG on p. 198 of Cox & Wermuth (1996)
amat <- DAG(y1 ~ y2 + y3, y3 ~ y5, y4 ~ y5)
A <- edgematrix(amat)
In(crossprod(A))
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