SpecialIndex-class function

The SpecialIndex class.

This class represents indexing using logical indexing or a list of indices into a matrix. class

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

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

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

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

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

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

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

SpecialIndex(expr, key)

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

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

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

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

## S4 method for signature 'SpecialIndex'
.grad(object)

Arguments

• x, object: An Index 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.

Methods (by generic)

• name(SpecialIndex): Returns the index in string form.
• is_atom_log_log_convex(SpecialIndex): Is the atom log-log convex?
• is_atom_log_log_concave(SpecialIndex): Is the atom log-log concave?
• get_data(SpecialIndex): A list containing key.
• .grad(SpecialIndex): Gives the (sub/super)gradient of the atom w.r.t. each variable

Slots

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