Re: Numeric for loop with rationals
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- Subject: Re: Numeric for loop with rationals
- From: Sean Conner <sean@...>
- Date: 2018年1月30日 10:04:33 -0500
It was thus said that the Great Charles Heywood once stated:
> I am confused on why you think you can't:
>
> Lua 5.3.4 Copyright (C) 1994-2017 Lua.org, PUC-Rio
> > function one() return 1 end
> > function two() return 2 end
> > function ten() return 10 end
> > for i=one(), ten(), two() do print(i) end
> 1
> 3
> 5
> 7
> 9
> >
That only works for numbers. Soni would like a custom type, like
rationals, as in the first example:
for x = r(1,10) , r(10,10) , r(1,10) do
print(x)
end
The stock numeric for in Lua is defined as:
do
local var, limit, step = tonumber(e1), tonumber(e2), tonumber(e3)
if not (var and limit and step) then error() end
var = var - step
while true do
var = var + step
if (step >= 0 and var > limit) or (step < 0 and var < limit) then
break
end
local v = var
block
end
end
The conversion of var, limit and step to numbers is preventing the use of
custom types that cannot be converted to numbers:
for i = "1" , "10" , "2" do print(i) end
-spc
- References:
- Re: Numeric for loop with rationals, Soni "They/Them" L.
- Re: Numeric for loop with rationals, dyngeccetor8
- Re: Numeric for loop with rationals, Soni "They/Them" L.
- Re: Numeric for loop with rationals, Francisco Olarte
- Re: Numeric for loop with rationals, Soni "They/Them" L.
- Re: Numeric for loop with rationals, Dirk Laurie
- Re: Numeric for loop with rationals, Soni "They/Them" L.
- Re: Numeric for loop with rationals, Dirk Laurie
- Re: Numeric for loop with rationals, Soni "They/Them" L.
- Re: Numeric for loop with rationals, Charles Heywood