[R] How to write output in a specific formate with irregular space

[Yihsu Chen]

Dear R users:

My question is how to write output in a specific formate with irregular 
spacing? 

Say that I have the following DF with three columns (A-C):

A      B         C
a10   100.0   212

The objective is to write an output file such that column A occupies 
1-10 spaces aligned to the left, column B occupies 11-15 spaces aligned 
to the right, and finally column C takes 16-25 spaces aligned to left.  
In other words, this is what it should be looked like, where the first 
row is simply the indices for "space".

1234567890123456789012345
a10               100.0212        


Thank you

Yihsu Chen
The Johns Hopkins University