[R] Conditional plot(Lattice)

[Brima]

Hi All, 

I am completely new to R. I have the below data and want to create a
conditional variable say Prof.H as such that it equals 1 if Prof is > 50 and
0 otherwise and create a scatter plot of Value and Dim conditional on the
new variable.     

      Area Value  Dim  Prof 
1         1 145.1  9.5   39.0 
2         2 128.3 10.1   50.5 
3         3 121.3  9.4   55.6 
4         4 134.4 11.6   45.0 
5         5 106.5 10.3   49.6 
6         6 111.5  9.5   44.3 
7         7 132.7 11.2   47.4 
8         8 126.9  9.0   60.0 

Any help is appreciated. 

Brima 
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