[R] Table and ftable

[Giulia Bennati]

Dear listmembers,
I have a little question: I have my data organized as follow

sic  level  area
a    211    2.4
b    311    2.3
b    322    0.2
b    322    0.5
c    100    3.0
c    100    1.5
c    242    1.5
d    222    0.2

where levels and sics are factors. I'm trying to obtain a matrix like this:

        level
         211    311    322   100    242     222
sic
a        2.4      0       0       0       0        0
b         0       2.3    0.7     0       0        0
c         0        0      0       4.5     1.5     0
d         0        0      0        0       0       0.2

I tryed with table function as
table(sic,level) but i obteined only a contingency table.
Have you any suggestions?
Thank you very much,
Giulia