Index-class function

The Index class.

This class represents indexing or slicing into a matrix. class

## S4 method for signature 'Expression,missing,missing,ANY'
x[i, j, ..., drop = TRUE]

## S4 method for signature 'Expression,numeric,missing,ANY'
x[i, j, ..., drop = TRUE]

## S4 method for signature 'Expression,missing,numeric,ANY'
x[i, j, ..., drop = TRUE]

## S4 method for signature 'Expression,numeric,numeric,ANY'
x[i, j, ..., drop = TRUE]

Index(expr, key)

## S4 method for signature 'Index'
to_numeric(object, values)

## S4 method for signature 'Index'
dim_from_args(object)

## S4 method for signature 'Index'
is_atom_log_log_convex(object)

## S4 method for signature 'Index'
is_atom_log_log_concave(object)

## S4 method for signature 'Index'
get_data(object)

## S4 method for signature 'Index'
graph_implementation(object, arg_objs, dim, data = NA_real_)

## S4 method for signature 'SpecialIndex'
to_numeric(object, values)

## S4 method for signature 'SpecialIndex'
dim_from_args(object)

Arguments

• x: A Expression object.
• i, j: The row and column indices of the slice.
• ...: (Unimplemented) Optional arguments.
• drop: (Unimplemented) A logical value indicating whether the result should be coerced to the lowest possible dimension.
• expr: An Expression representing a vector or matrix.
• key: A list containing the start index, end index, and step size of the slice.
• object: An Index object.
• values: A list of arguments to the atom.
• arg_objs: A list of linear expressions for each argument.
• dim: A vector representing the dimensions of the resulting expression.
• data: A list of additional data required by the atom.

Methods (by generic)

• to_numeric(Index): The index/slice into the given value.
• dim_from_args(Index): The dimensions of the atom.
• is_atom_log_log_convex(Index): Is the atom log-log convex?
• is_atom_log_log_concave(Index): Is the atom log-log concave?
• get_data(Index): A list containing key.
• graph_implementation(Index): The graph implementation of the atom.
• to_numeric(SpecialIndex): The index/slice into the given value.
• dim_from_args(SpecialIndex): The dimensions of the atom.

Slots

• expr: An Expression representing a vector or matrix.
• key: A list containing the start index, end index, and step size of the slice.