Given a (forecast) data frame, inspects the column names and returns the quantile numbers. This function does no input validation.
Examples
# returns c(2.5, 50, 97.5)
casteval:::get_quant_percentages(
data.frame(time=1:3, val_q2.5=4:6, val_q50=7:9, val_q97.5=10:12)
)
#> [1] 2.5 50.0 97.5