Description Usage Arguments Details Value Missing and non- values Author(s) See Also

Gets the rank of each row (column) of a matrix.

1 2 3 4 5 |

`x` |
A |

`rows, cols` |
A |

`ties.method` |
A |

`dim.` |
An |

`...` |
Not used. |

`preserveShape` |
A |

The row ranks of `x`

are collected as *rows* of the result matrix.

The column ranks of `x`

are collected as *rows* if
`preserveShape = FALSE`

, otherwise as *columns*.

The implementation is optimized for both speed and memory. To avoid
coercing to `double`

s (and hence memory allocation), there
is a unique implementation for `integer`

matrices. It is
more memory efficient to do `colRanks(x, preserveShape = TRUE)`

than
`t(colRanks(x, preserveShape = FALSE))`

.

Any `names`

of `x`

are ignored and absent in the
result.

An `integer`

`matrix`

is
returned. The `rowRanks()`

function always returns an NxK
`matrix`

, where N (K) is the number of rows (columns)
whose ranks are calculated.

The `colRanks()`

function returns an NxK `matrix`

, if
`preserveShape = TRUE`

, otherwise a KxN `matrix`

.

for
`double`

.

These are ranked as `NA`

, as with
`na.last = "keep"`

in the `rank`

() function.

Hector Corrada Bravo and Harris Jaffee. Peter Langfelder for adding
'ties.method' support. Henrik Bengtsson adapted the original native
implementation of `rowRanks()`

from Robert Gentleman's `rowQ()`

in
the Biobase package.

`rank`

(). For developers, see also Section
'Utility functions' in 'Writing R Extensions manual', particularly the
native functions `R_qsort_I()`

and `R_qsort_int_I()`

.

matrixStats documentation built on May 30, 2017, 1:05 a.m.

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