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@identity

Identity matrix.

Syntax: @identity(n)

n: integer

Return: matrix

Returns a square

identity matrix.

Examples

matrix i4 = @identity(4)

creates a

identity matrix.

matrix k4 = @kronecker(@fill(1, 2, 3), @identity(4))

generates the

matrix formed by taking the Kronecker product of the 3 element vector and the

identity matrix.

sym z = @inner(@mnrnd(3, 3))

matrix k3 = @kronecker(@scale(@identity(3), @mrnd(3, 1)), z)

creates a

block diagonal matrix where a block equals Z multiplied by a random uniform number.

Cross-references

See also @ones, @unitvector, and @zeros.