[R] add columns to a data.frame

[juan pablo perez]

Dear R community:

it is possible to add a column wich results from an algebraic combination of 
columns from a data frame to the same data frame?

e.g

I have a data frame like
$X: num[1:10] 10,20,25,20...
$Y: num[1:10] 152,458,698,587,...
and I want to add a new column like
$Z where Z=X+5*Y

what should I do?

Thanks in advance

Juan Pablo



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