Large loops in R

Dear all,

I need to access data from a large matrix (48000 x 48000) and to do it
I am trying to run two loops using "for" command. Surely it is been a
very slow job.

I heard that "for" is not the best option to perform large loops in R,
but I don't really know what would be the best (fast) option. sapply?
vapply? Could anyone help me with this issue, please?

Thank you very much for your attention and for any help!

Best regards,

Charles

Um ax?! :)

--
Charles Novaes de Santana
http://www.imedea.uib-csic.es/~charles
PhD student - Global Change
Laboratorio Internacional de Cambio Global
Department of Global Change Research
Instituto Mediterr?neo de Estudios Avanzados(CSIC/UIB)
Calle Miquel Marques 21, 07190
Esporles - Islas Baleares - Espa?a

Office phone - +34 971 610 896
Cell phone - +34 660 207 940