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Global options of your R workspace. Use options(scipen = n) to display numbers in scientific format or fixed. Positive values bias towards fixed and negative towards scientific notation. You can reset this option with options(scipen = 0) .
If you want to avoid scientific notation for a given number or a series of numbers, you can use the format() function by passing scientific = FALSE as an argument.
I think it would probably be best to use formatC rather than change global settings.
For your case, it could be:
numb <- c(0.05, 0.05671, 0.000000027)
formatC(numb, format = "e", digits = 2)
Which yields:
[1] "5.00e-02" "5.67e-02" "2.70e-08"
Another option is to use the scientific from the scales library.
library(scales)
numb <- c(0.05, 0.05671, 0.000000027)
# digits = 3 is the default but I am setting it here to be explicit,
# and draw attention to the fact this is different than the formatC
# solution.
scientific(numb, digits = 3)
## [1] "5.00e-02" "5.67e-02" "2.70e-08"
Note, digits is set to 3, not 2 as is the case for formatC
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