[R] gridding values in a data frame

[dxc13]

Hi all,
I have a data frame that looks like such:
LATITUDE   LONGITUDE   TEMPERATURE   TIME
36.73         -176.43        58.32               1
50.95            90.00        74.39               1
-30.42            5.45        23.26               1
15.81         -109.31        52.44               1
-80.75        -144.95        66.19              2
90.00          100.55        37.50               2
65.41         -4.49           29.83               2

and this goes on for a A LOT more records, until time=1200

I want to create a 5 degree by 5 degree grid of this data, with the value of
temperature in the appropriate grid cell.  I want one grid for each time
value.  For each time value, this works out to be a 36x72 grid with 2592
cells because the longitude spans -180 to 180 and latitude spans 90 to -90
and they would be in increments of 5 degrees.  If there are no temperatures
available to be put into a grid cell, than that cell should get a missing
value, NA, put into it.
Also, could the gridded result for each time be written to a text file
before processing the next time value?

Hope this is clear.  
Thanks in advance.

dxc13
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