search for: settruelength

Displaying 2 results from an estimated 2 matches for "settruelength".

2015 Jun 08
4
columna de un data.table puede ser data.frame?
...Col))) Es posible hacer lo que digo? o debo hacer una transformación del data.frame a data.table explícitamente. Esto también lo he probado con el código: # Conversión de data.frame a data.table setattr(PesosParam, "class", c("data.table", "data.frame")) data.table:::settruelength(PesosParam, 0L) invisible(alloc.col(PesosParam)) pero no encuentra settruelength Gracias Un saludo MªLuz Morales [[alternative HTML version deleted]]
2005 Sep 04
1
A memory management question
Can someone explain the use of SETLENGTH() and SETTRUELENGTH()? I would like to allocate a vector and reserve some space at the end, so that it appears shorter than the allocated size. So that I can more efficiently append to the vector, without requiring a new copy every time. So I'd like to use SETLENGTH() with a shorter apparent length, and bump thi...