R: Coerce a list to a vector

as_vector {purrr} | R Documentation

## Coerce a list to a vector

### Description

`as_vector()` collapses a list of vectors into one vector. It checks that the type of each vector is consistent with `.type`. If the list can not be simplified, it throws an error. `simplify` will simplify a vector if possible; `simplify_all` will apply `simplify` to every element of a list.

### Usage

    as_vector(.x, .type = NULL)

    simplify(.x, .type = NULL)

    simplify_all(.x, .type = NULL)

### Arguments

`.x` | A list of vectors
`.type` | A vector mold or a string describing the type of the input vectors. The latter can be any of the types returned by `typeof()`, or "numeric" as a shorthand for either "double" or "integer".

### Details

`.type` can be a vector mold specifying both the type and the length of the vectors to be concatenated, such as `numeric(1)` or `integer(4)`. Alternatively, it can be a string describing the type, one of: "logical", "integer", "double", "complex", "character" or "raw".

### Examples

    # Supply the type either with a string:
    as.list(letters) %>% as_vector("character")

    # Or with a vector mold:
    as.list(letters) %>% as_vector(character(1))

    # Vector molds are more flexible because they also specify the
    # length of the concatenated vectors:
    list(1:2, 3:4, 5:6) %>% as_vector(integer(2))

    # Note that unlike vapply(), as_vector() never adds dimension
    # attributes. So when you specify a vector mold of size > 1, you
    # always get a vector and not a matrix

[Package purrr version 0.2.2 Index]