I have an object called rcom which was created by the command rcom 
<-"mean(mat_rix$COL_1)". Also the data-frame mat_rix is well defined with 
numeric values in its column 1 and its name is "COL_1".

My question is how to extract (or do something with) the content of rcom 
so that it provides the mean value which I want.
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