    @map_history(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 successive values assigned 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_date and @map_history_rdate.

See also system related functions: @arch_darwin, @arch_linux, @arch_windows, @dumpvar, @gnuplot, @history_length, @loadvalue, @loadvar, @plot, @rplot, @savevalue, @set_osc_handling_tab, @string2fun, @string2obj, @string2proc, @system

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