[R] How to create gridded data

[lily li]

Hi R users,

I have a question about manipulating data. For example, I have DF1 as the
following, how to transform it to a gridded dataset DF2? In DF2, each value
Precip is an attribute of the corresponding grid cell. So DF2 is like a
spatial surface, and can be imported to ArcGIS. Thanks for your help.

DF1
latitude   longitude   Precip
45.5           110.5         3.2
45.5           111            5.0
45.5           111.5         1.8
45.5           112            2.0
46              110.5         6.1
46              111            4.5
46              111.5         7.8
46              112            5.5
...


DF2
6.1   4.5   7.8   5.5
3.2   5.0   1.8   2.0
...

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