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Question regarding tables

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Posted by Edoren   (31 posts)  [Biography] bio
Date Reply #15 on Sun 22 Apr 2007 05:03 AM (UTC)

Amended on Sun 22 Apr 2007 05:05 AM (UTC) by Edoren

Message
oh duh, i didn't even think about using the names for that! hmm, does the same thing work for inserting then? ie -

table.insert (lastfish.fish, (wildcards.fish))
table.insert (lastfish.pounds, wildcards.pounds)
table.insert (lastfish.ounces, (wildcards.ounces) or 0)?
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Posted by Nick Gammon   Australia  (21,323 posts)  [Biography] bio   Forum Administrator
Date Reply #16 on Sun 22 Apr 2007 06:07 AM (UTC)
Message
I'm not exactly sure what you mean by "inserting" in this case. If you do this:


lastfish.fish = wildcards.fish


You *have* inserted wildcard.fish into the lastfish table, keyed by the name "fish".

When you use table.insert you are inserting something with a numeric key, which you probably don't want here.

- Nick Gammon

www.gammon.com.au, www.mushclient.com
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Posted by Nick Gammon   Australia  (21,323 posts)  [Biography] bio   Forum Administrator
Date Reply #17 on Sun 22 Apr 2007 06:16 AM (UTC)
Message
To illustrate that, consider this test:


require "tprint"

lastfish = {}

lastfish.fish = "cod"
lastfish.pounds = 42
lastfish.ounces = 10

tprint (lastfish)


Output

"fish"="cod"
"ounces"=10
"pounds"=42


Here we have put details about the fish into the table, keyed by the item name (eg. lastfish.fish is "cod").

Next time the trigger fires, it will replace the items with the new ones.

If you use table.insert, things just get a numeric key, like this:


require "tprint"

lastfish = {}

table.insert (lastfish, "cod")
table.insert (lastfish, 42)
table.insert (lastfish, 10)

tprint (lastfish)

Output

1="cod"
2=42
3=10


You can see that isn't as easy to use. Also, if you insert more stuff, it gets added, not replaced:


table.insert (lastfish, "flounder")
table.insert (lastfish, 16)
table.insert (lastfish, 12)

tprint (lastfish)

Output

1="cod"
2=42
3=10
4="flounder"
5=16
6=12



Try reading my post about Lua tables:

http://www.gammon.com.au/forum/?id=6036

- Nick Gammon

www.gammon.com.au, www.mushclient.com
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Posted by Edoren   (31 posts)  [Biography] bio
Date Reply #18 on Sun 22 Apr 2007 06:28 AM (UTC)
Message
well the thing was i didn't want to replace something based on name since, the fish names are basically only a few different types. so if i wanted to keep a running tally/list of what i had caught it would be replaced rather than being stored everytime it finds the same name.
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Posted by Nick Gammon   Australia  (21,323 posts)  [Biography] bio   Forum Administrator
Date Reply #19 on Sun 22 Apr 2007 06:49 AM (UTC)
Message
You want to keep tally of each individual fish, is that it? You still don't want table.insert. Something like this is more like it:


lastfish [wildcards.fish] = {
  pounds = wildcards.pounds, 
  ounces = wildcards.ounces }


What that will do is create a sub-table, in the lastfish table, keyed by the name of the fish, and inside it will be the details for that type.

eg.

The table might contain:


lastfish.cod.pounds = 42
lastfish.cod.ounces = 10
lastfish.flounder.pounds = 11
lastfish.flounder.lounces = 2



- Nick Gammon

www.gammon.com.au, www.mushclient.com
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Posted by Edoren   (31 posts)  [Biography] bio
Date Reply #20 on Sun 22 Apr 2007 11:54 AM (UTC)
Message
aha! that's what i was looking for.
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Posted by Edoren   (31 posts)  [Biography] bio
Date Reply #21 on Sun 22 Apr 2007 06:28 PM (UTC)

Amended on Sun 22 Apr 2007 08:14 PM (UTC) by Edoren

Message
hmm what's wrong with this? numkey wont ever add.

function reel_stop (name, line, wildcards)
 local numkey=numkey or 0
 local gold=gold or 0
 local pounds=tonumber (wildcards.pounds) or 0
 local ounces=tonumber (wildcards.ounces) or 0
  EnableTrigger ("reel_caught", false)
  Send ("put fish in kitbag")
  lastfish [numkey] = {
   fish = wildcards.fish,
   pounds = wildcards.pounds, 
   ounces = wildcards.ounces }
  if pounds > 0 then
   count= pounds*16 + ounces
   if gold > 0 then
    gold=gold + count*0.8
   else
    gold=count*0.8
   end --gold
  else
   if gold > 0 then
    gold=gold + ounces*0.8
   else
    gold=ounces*0.8
   end --gold
  end --pounds
  numkey=numkey+1
 end --stop reel
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Posted by Nick Gammon   Australia  (21,323 posts)  [Biography] bio   Forum Administrator
Date Reply #22 on Sun 22 Apr 2007 08:42 PM (UTC)
Message
You made numkey local, so each time the function is called, it is back to nil. Remove the word "local" from in front of it.

- Nick Gammon

www.gammon.com.au, www.mushclient.com
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