R How to use which() with floating point values?

Question

I have run into the same problem as described at R which () function returns integer(0)

price = seq(4,7, by=0.0025)
allPrices = as.data.frame(price)
lookupP         


        

Answer 1

There is a function near in dplyr:

near(x, y, tol = .Machine$double.eps^0.5)

For this case, you can try:

which(near(allPrices$price, lookupPrice))
#[1] 425