Re: help for newbie -- make an list-table where the key is integer and the value is a hash-table-record

[Russell Haley <russ.haley@...>]

On Tue, Oct 3, 2017 at 8:39 PM, Sean Conner <sean@conman.org> wrote:
> It was thus said that the Great douglas mcallaster once stated:
>> Would a kind soul please help me get started with a simple job task.
>>
>> Below job runs but returns the last record from my data file for all six
>> lines in the data file.
>> The print statements echo that it is working as I expect up until the
>> table.insert command
>>
>> I have looked thru both PiL and Beginning Lua Programming and cannot find
>> how to properly do this simple task.
>>
>> +++++++++++++++++++++++++++++
>>
>> -- lines from input file d1dat.txt:
>> -- one|123|aaa
>> -- one|123|a
>> -- two|45|a
>> -- three|6789|b
>> -- on1|123|b
>> -- tw1|45|c
>> -- th1|6789|c
>>
>> io.input  ('d1dat.txt')
>> io.output ('d1dat.out')
>>     l= '_' -- scalar -- a line (char) from input file
>>  rows= {}  -- a list ie int,val_l -- use ipairs
>>  cols= {}  -- a hash ie nam,val   -- use  pairs
>>  dsn1= {}  -- a list ie int,tbl   -- use ipairs
>>
>> for l in io.lines()
>>  do rows[#rows+1]= l
>>  end
>>
>> for _,v in ipairs(rows)
>>  do local   a    = '_'
>>     local     b  =  0
>>     local       c= '_'
>>             a,b,c= string.match (v, "(%w+)|(%d+)|(%w+)") -- parse the line
>>     print (a,b,c)
>>     cols['v1']= a -- populate the hash (table)
>>     cols['v2']= b
>>     cols['v3']= c
>>     for kc,vc in pairs (cols) do print(kc,vc) end
>>     table.insert (dsn1, cols)
>> --  dsn1 [ #dsn1+1 ]=   cols -- gives same result: every row in dsn1 is the
>> last row from input file
>>  end
>>
>> for k,v in ipairs (dsn1)
>>  do io.write (k ,'-' ,v.v1 ,'-' ,v.v2 ,'-' ,v.v3 ,'\n')
>>  end
>> -- d1dat.out:
>> -- 1-th1-6789-c
>> -- 2-th1-6789-c
>> -- 3-th1-6789-c
>> -- 4-th1-6789-c
>> -- 5-th1-6789-c
>> -- 6-th1-6789-c
>
>   If I understand what you want, what about?
>
>         io,input('d1dat.txt')
>         io.output('d1dat.out')
>
>         data = {}
>
>         for l in io.lines() do
>           a,b,c = string.match(l,"(%w+)|(%d+)|(%w+)")
>           table.insert(data, { a , b, c })
>         end
>
>         for k,v in ipairs(data) do
>           io.write(k,'-',data[1],'-',data[2],'-',data[3],'\n')
>         end
>
>   -spc

Sorry, Seans answer works too. I got confused when the io.write threw an error:

lua_: test.lua:18: bad argument #3 to 'write' (string expected, got table)
stack traceback:
    [C]: in function 'io.write'
    test.lua:18: in main chunk
    [C]: in ?

This is correct though:
for k,v in ipairs(data) do
  --print(k, data[k][1],data[k][2],data[k][3])
  io.write(k,'-',data[k][1],'-',data[k][2],'-',data[k][3],'\n')
end

Cheers,
Russ