Convert rgb to HEX code
rgb2hex(r, g, b)Values that correspond to the three RGB parameters
Returns a string containing a HEX code.
Other Support: 
camel_clean(),
check_inputs(),
combine_signals(),
cut_hour(),
extract_date_range(),
extract_hr(),
heat_colours(),
is_date_format(),
maxmin(),
p_test(),
pairwise_count(),
plot_WOE(),
read_preamble(),
totals_bind(),
totals_col(),
totals_reorder(),
tstamp(),
us_to_space(),
wrap()