Hello all
 
I have a geology map that has three level, bellow
 
<-geology
lithology    landscape   landform
 
 
landform level is used as covariate (with codes=1,2,3,4,5) for training of neural network, but this level has missing data as NA. 
I want to replace the missing data of landform level with 0 (zero). Finally, landform will have codes  0,1,2,3,4,5.
 
please help me
 
Thanks alot.
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