[R] replace NA

From: azam jaafari <azamjaafari_at_yahoo.com>
Date: Fri, 06 May 2011 13:12:46 -0700 (PDT)


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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