Linear model function lm() error: NA/NaN/Inf in foreign function call (arg 1)

Question

Say I have data.frame a

I use

m.fit <- lm(col2 ~ col3 * col4, na.action = na.exclude)

col2 has some <

Answer 1

I solved this type of problem by resetting my options. options(na.action="na.exclude") or options(na.action="na.omit")

I checked my settings and had previously changed the option to "na.pass" which didn't drop my y observations with NAs (where y~x).