Lists of integers
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- Subject: Lists of integers
- From: Dirk Laurie <dpl@...>
- Date: 2011年8月24日 17:17:08 +0200
What is the most Lua-tic way of writing a function that:
(a) returns {m,m+k,...,m+(n-1)*k} given n? I.e. please improve on:
function arith(n,m,k)
k = k or 1
m = m or 1
local s = {}
for i=1,n do s[i]=m; m=m+k end
return s
end
(b) given a list of integers, returns the complement of that
list in the range 1..n. I.e. please improve on:
function complement(x,n)
local y={}
for _,j in ipairs(x) do y[j]=true end
local s = {}
for i=1,n do if not y[i] then s[#s+1]=i end end
return s
end
Dirk