[R] How to read unbalanced data from file?

[wfang]

Hi,
   I tried to read some unbalance data (with different number if rows) 
using x<- read.table("filename", header = true) command, but the program 
refuses to read the table. Could you tell me why this is happening and how 
to fix it? I just want to create a ANOVA table.
   Thanks.
   Wenyi