[R] increase memory in R

[alessia matano]

Dear all,
I write you to ask you a suggestion about increasing memory in R. I
use a pc with ram of 4gb, and I put in the link of R the following
statementes, --max-memory.size=2074M and --max-vsize==500M, as I red
in many faq concerning this topic. However, when I run some
regression, the program often write like cannot allocate vector of
size 124M. How can it be possible? What should I do about it? Did I
wrong something?
many thanks for any suugestion
alessia