st: replacing some values in column A by the values from column B

["Oliinik, Victoria" <Victoria.Oliinik@econ.kuleuven.be>]

Dear statalisters, 

Does anyone know whether (and how) I can get Stata to do the following:

I have a variable "materials" which contains a lot of missing and
negative values. Where values are missing, or negative, I want Stata to
take corresponding values from a variable "costmater" and replace them
in the column "materials".

Thanks 
Victoria



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