short formula call for many variables when building a model [duplicate]

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You can use . as described in the help page for formula. The . stands for “all columns not otherwise in the formula”.

lm(output ~ ., data = myData).

Alternatively, construct the formula manually with paste. This example is from the as.formula() help page: 

xnam <- paste("x", 1:25, sep="")
(fmla <- as.formula(paste("y ~ ", paste(xnam, collapse= "+"))))

You can then insert this object into regression function: lm(fmla, data = myData).

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