Description Usage Arguments Details Value Note Author(s) See Also Examples

Extract or replace parts of a hyper2 object

1 2 3 4 |

`x` |
An object of class |

`...` |
Further arguments, currently ignored |

`index` |
A list with integer vector elements corresponding to the brackets whose power is to be replaced |

`value` |
Numeric vector of powers |

These methods should work as expected, although the off-by-one issue might be a gotcha.

For the extract method, a numeric vector is returned but the elements may be in any order (the brackets and indeed the powers are not stored in any particular order).

The replace method, `H[L] <- value`

, the index `L`

is a list
specifying the brackets to be overwritten; argument `value`

is not
recycled unless it is of length 1.

If the index argument is missing, viz `H1[] <- H2`

, this is a
special case. Argument `H1`

must be a `hyper2`

object, and
the idiom effectively executes `H1[brackets(H2)] <- powers(H2)`

,
but more efficiently (note that this operation is well-defined even
though the order of the brackets is arbitrary). This special case is
included in the package because it has a very natural `C++`

expression [function `overwrite()`

in the `src/`

directory]
that was too neat to omit.

Altering (incrementing or decrementing) the power of a single bracket
is possible using idiom like `H[x] <- H[x] + 1`

; this is
documented at `Ops.hyper2`

, specifically
`hyper2_sum_numeric()`

.

The extractor method returns a `hyper2`

object, restricted to the
elements specified

Use `powers()`

and `brackets()`

to extract a numeric vector of
powers or a list of integer vectors respectively.

Replacement idiom `H[x] <- val`

cannot use non-trivial recycling.
This is because the elements of `H`

are stored in an arbitrary
order, but the elements of `val`

are stored in a particular order.
Also see function `hyper2_sum_numeric()`

.

Robin K. S. Hankin

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 |

Embedding an R snippet on your website

Add the following code to your website.

For more information on customizing the embed code, read Embedding Snippets.