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Contents >> Applied Mathematics >> Matrix Algebra >> Principles of Matrix Calculation >> Cellular matrices

Matrix Algebra - Cellular matrices

Cellular matrices

Let's consider some matrix A and we’ll split it into matrices of lower order:

which are called cells or blocks.

Here cells (blocks) are matrices:

Now the matrix A can be considered as cellular or block matrix:

which elements are cells (blocks).

Apparently, that splitting of any matrix into cells (blocks) is maybe executed by various ways. In that specific case the cellular matrix can be quasi-diagonal one:

where cells– square matrices (generally speaking, of different orders), and outside of cells zeros are. Note, that
Cellular matrices of the same dimensions and with identical splitting are called conform.

Operations with cellular matrices are carried out by the same rules, as with usual matrices.

1. Addition and subtraction of cellular matrices

Let there are two conform cellular matrices:

where  p = r, q = s  and cells  of identical dimension. Then

Subtraction of cellular matrices is carried out similarly.

2. Multiplication of cellular matrices

Multiplication of a cellular matrix to a number (scalar)

Let A – a cellular matrix and h – a number, then we have:

Multiplication of cellular matrices

Let's consider two conform cellular matrices:

and  q = r .

Let all cells such, that a number of columns of a cell is equal to a number of rows of a cell (For example, apparently, that it takes place in that specific case, when all cells  – square matrices and have also the same order). Then it is easy to show, that a product of matrices A and B is too a cellular matrix:

where that is multiplication of cellular matrices is similar to multiplication of numerical matrices [2].

E x a m p l e .  Multiply the cellular matrices

S o l u t i o n .

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Last updated: December 30, 2017.