I have a Data Frame that contains, between other things, the following
fields: userX, Time1, Time2, Time3. The number of observations is 2000.

I have a function that has as inputs userX, Time1, Time2, Time3 and return
a data frame with 1 observation and 19 variables.

I want to apply that function to all the observations of the first data
frame to make a new data frame with 2000 observations and 19 variables.

I thought about using lapply, but if I understand correctly, it only takes
one variable.

Can somebody point me in the right direction?

Thanks!

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