CODEWITHSUNDEEP
linuxlua
Marty
Marty

Reputation: 73

Trying to print a table in lua

I am trying to print the following as output in lua.

inertia_x = {
{46.774, 0., 0.},
{0., 8.597, 0.},
{0., 0., 50.082}
}

x = {mass = 933.0, com = {0.0, 143.52, 0.0}, inertia_x}

print(x)

This code was written in a text editor and named sample.lua

Now I am using linux and I go to the correct directory while the .lua file is stored and I call

$ lua sample.lua

and output is table: 0x55c9fb81e190

I would ideally like to get x printed like a list

This is my 2nd lua program after Hello World. Very new to Linux and programming as well.

I would greatly appreciate your help!

Upvotes: 5

Views: 9209

Answers (2)

user11193505
user11193505

Reputation:

You need to detect table and recursively build the table dump. Try this : 

local inertia_x = {
{46.774, 0., 0.},
{0., 8.597, 0.},
{0., 0., 50.082}
}

local x = {mass = 933.0, com = {0.0, 143.52, 0.0}, inertia_x}

local function dump (  value , call_indent)

  if not call_indent then 
    call_indent = ""
  end

  local indent = call_indent .. "  "

  local output = ""

  if type(value) == "table" then
      output = output .. "{"
      local first = true
      for inner_key, inner_value in pairs ( value ) do
        if not first then 
          output = output .. ", "
        else
          first = false
        end
        output = output .. "\n" .. indent
        output = output  .. inner_key .. " = " .. dump ( inner_value, indent ) 
      end
      output = output ..  "\n" .. call_indent .. "}"

  elseif type (value) == "userdata" then
    output = "userdata"
  else 
    output =  value
  end
  return output 
end

print ( "x = " .. dump(x) )

Upvotes: 1

brianolive
brianolive

Reputation: 1671

For example:

for key, value in pairs(yourTable) do
    print(key, value)
end

If you need to handle nested tables, then use:

if type(value) == "table" then
    -- Do something
end

I'll leave it as an exercise to take the above elements and make one, recursive function to dump nested tables.

Upvotes: 7

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