Extends the out of memory vectors of 'ff' with
statistical functions and other utilities to ease their usage.

Basic Statistical Functions for Package 'ff'

package-ubuntu-20.04-r-4.0.5#cran#ffbase-0.13.3

<code>condSum</code> works like a very fast version of tapply with <code>FUN=sum</code>.

<table summary="R argblock">
<tr valign="top">
<td><code>x</code></td>
<td>
<code>numeric</code> vector to be summed
</td>
</tr>
<tr valign="top">
<td><code>index</code></td>
<td>
(list of) <code>factor(s)</code> for which the sum will be calculated
</td>
</tr>
<tr valign="top">
<td><code>na.rm</code></td>
<td>
<code>logical</code> If <code>TRUE</code> <code>NA</code> values will be removed
</td>
</tr>
<tr valign="top">
<td><code>...</code></td>
<td>
not used
</td>
</tr>
</table>

<code>array</code> with dimensions of <code>index</code>

package-ubuntu-20.04-r-4.0.5#cran#ffbase-0.13.3#docs#condSum

`x`	`numeric` vector to be summed
`index`	(list of) `factor(s)` for which the sum will be calculated
`na.rm`	`logical` If `TRUE` `NA` values will be removed
`...`	not used

condSum

Description

Usage

Arguments

Value

ffbase

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