# Working with very small values in R

** Published:**

When you’re working on extremely small floating numbers in R (such as when you have strong p-values), there are a few options.

- Rmpfr package
- Parse the string of values in scientific notation. Let’s say you have small values in
`P`

column in a dataframe`df`

and those numbers are represented as`1e-400`

etc. Then, you can run something like this to parse and compute the`log10(P)`

value.

```
df %>%
separate(P, c('P_base', 'P_exp'), sep='e', remove=F, fill='right') %>%
replace_na(list(P_exp='0')) %>%
mutate(log10P = log10(as.numeric(P_base)) + as.numeric(P_exp))
```