cut_ext: Convert Numeric to Factor with custom condition
In ErickChacon/day2day: Functions for Day-to-Day Data Analysis

cut_ext converts a numeric object to factor given the breaks and condition applied to the high threshold of each interval.

1	cut_ext(x, breaks, condition = NULL)

`x`	numeric vector to be converted to factor. breaks numeric vector of breaks to be included. condition condition to be applied to the high threshold of interval.
`breaks`	break point to divide the categories.
`condition`	condition for each break point in order to define open or close intervals.