cmm (version 1.0)

DirectSum: DirectSum

Description

Returns the direct sum of two matrices.

Usage

DirectSum(...)

Value

matrix

Arguments

...

List of one or more matrices

Author

W. P. Bergsma

Details

Standard mathematical direct sum operator.

References

Bergsma, W. P. (1997). Marginal models for categorical data. Tilburg, The Netherlands: Tilburg University Press. http://stats.lse.ac.uk/bergsma/pdf/bergsma_phdthesis.pdf

Bergsma, W. P., Croon, M. A., & Hagenaars, J. A. P. (2009). Marginal models for dependent, clustered, and longitudunal categorical data. Berlin: Springer.

See Also

ConstraintMatrix, DesignMatrix, DirectSum

Examples

 a <- matrix(1:12,3,4)
 DirectSum(a)     #returns a
 DirectSum(a,a)   #returns direct sum of a and a
 DirectSum(a,a,a) #returns direct sum of a, a and a