@map_history_date(variable)
This is a special form: the argument must be a variable identifier. It
returns a map where the keys are integers and the values are the date in
physical times of the successive assignements to the variable. Integer
0
corresponds to the current value, 1
to the previous value,
etc. Variable's history has a bounded length that can be specified
using a @local
or a@global
declaration.
See also @tab_history, @map_history and @map_history_rdate.
See also system related functions: @arch_darwin, @arch_linux, @arch_windows, @dumpvar, @exe_child_of, @exe_parent, @gnuplot, @history_length, @loadvalue, @loadvar, @plot, @rplot, @savevalue, @set_osc_handling_double, @set_osc_handling_int64, @set_osc_handling_tab, @specified_duration, @string2fun, @string2obj, @string2proc, @system