[R] write fixed format

[YIHSU CHEN]

Dear R users;

Is there a function in R that I can put "text" with proper alignments in 
a fixed format.  For instance, if I have three fields: A, B and C, where 
both A and C are text with 3 characters and left alignment; B is a 
numeric one with 2 decimals and 3 integer space digits.   How can I put 
the following row in a file? (note there is a space between a and 2, and 
after b.) (A=aaa, B=23.11 and C=bb)
"aaa 23.11bb "

Yours,

Yihsu Chen