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In

Indicator matrix

Description

Finds the indicator matrix of the zeros of a matrix.

Usage

In(A)

Arguments

A

a matrix.

Details

The indicator matrix is a matrix of zeros and ones which has a zero element iff the corresponding element of A is (exactly) zero.

Value

a matrix of the same dimensions as A.

Author(s)

Giovanni M. Marchetti

References

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.

See Also

Examples

## 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))
ggm

Graphical Markov Models with Mixed Graphs

v2.5
GPL-2
Authors
Giovanni M. Marchetti, Mathias Drton, Kayvan Sadeghi
Initial release
2020-02-014

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