ffbase: ffappend – R documentation

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ffappend

Append a ff vector to another ff vector

Appends (ff) vector y to ff vector x. Please note that the data of x will be coerced to the type of y if y has a higher vmode.

ffappend(x, y, adjustvmode = TRUE, ...)

`x`	`ff` object where data will be appended to. If `x==NULL` a new `ff` object will be created
`y`	`ff` object or vector object
`adjustvmode`	logical, indicating to coerce x to a higher `vmode` to make sure y is appended without loss of information.
`...`	parameter that will be passed on to `chunk` interally

ff object with same physical storage as x unless y has a higher vmode in which case the data will be cloned to the higher vmode