Constant-class function

The Constant class.

This class represents a constant.

Coerce an R object or expression into the Constant class. class

Constant(value)

## S4 method for signature 'Constant'
show(object)

## S4 method for signature 'Constant'
name(x)

## S4 method for signature 'Constant'
constants(object)

## S4 method for signature 'Constant'
value(object)

## S4 method for signature 'Constant'
is_pos(object)

## S4 method for signature 'Constant'
grad(object)

## S4 method for signature 'Constant'
dim(x)

## S4 method for signature 'Constant'
canonicalize(object)

## S4 method for signature 'Constant'
is_nonneg(object)

## S4 method for signature 'Constant'
is_nonpos(object)

## S4 method for signature 'Constant'
is_imag(object)

## S4 method for signature 'Constant'
is_complex(object)

## S4 method for signature 'Constant'
is_symmetric(object)

## S4 method for signature 'Constant'
is_hermitian(object)

## S4 method for signature 'Constant'
is_psd(object)

## S4 method for signature 'Constant'
is_nsd(object)

as.Constant(expr)

Arguments

• value: A numeric element, vector, matrix, or data.frame. Vectors are automatically cast into a matrix column.
• x, object: A Constant object.
• expr: An Expression , numeric element, vector, matrix, or data.frame.

Returns

A Constant representing the input as a constant.

Methods (by generic)

• name(Constant): The name of the constant.
• constants(Constant): Returns itself as a constant.
• value(Constant): The value of the constant.
• is_pos(Constant): A logical value indicating whether all elements of the constant are positive.
• grad(Constant): An empty list since the gradient of a constant is zero.
• dim(Constant): The c(row, col) dimensions of the constant.
• canonicalize(Constant): The canonical form of the constant.
• is_nonneg(Constant): A logical value indicating whether all elements of the constant are non-negative.
• is_nonpos(Constant): A logical value indicating whether all elements of the constant are non-positive.
• is_imag(Constant): A logical value indicating whether the constant is imaginary.
• is_complex(Constant): A logical value indicating whether the constant is complex-valued.
• is_symmetric(Constant): A logical value indicating whether the constant is symmetric.
• is_hermitian(Constant): A logical value indicating whether the constant is a Hermitian matrix.
• is_psd(Constant): A logical value indicating whether the constant is a positive semidefinite matrix.
• is_nsd(Constant): A logical value indicating whether the constant is a negative semidefinite matrix.

Slots

• value: A numeric element, vector, matrix, or data.frame. Vectors are automatically cast into a matrix column.
• sparse: (Internal) A logical value indicating whether the value is a sparse matrix.
• is_pos: (Internal) A logical value indicating whether all elements are non-negative.
• is_neg: (Internal) A logical value indicating whether all elements are non-positive.

Examples

x <- Constant(5)
y <- Constant(diag(3))
get_data(y)
value(y)
is_nonneg(y)
size(y)
as.Constant(y)