insert Knn csv into table LUA - csv

Question

I'm trying to load csv containing knn data (3 columns no names)
e.g
4 3 a
1 3 a
3 3 a
4 5 b
I have been able to load the file into a string.
When I try to move that into a table I get no errors, however when I print the table to screen I get values of nil.
I tried changing contents of file which gives the same result and if changed to (knn_data) I get the path address of the csv in all keys.
I'm trying to get the csv data to appear within the indexed table and in its 3 columns.
Here is the code:
--load kNN file.
local knn_data = system.pathForFile("knn.csv", system.ResourceDirectory)
local file, errorString = io.open(knn_data, "r")
if not file then
print("File Error: File Unavailable")
else
local contents = file:read("*a")
print(contents)
io.close(file)
end
file = nil
-- load data into table
dataset = {}
for line in io.lines(knn_data) do
dataset[#dataset+1] = (contents)
Previously attached screenshot of code

Answer 1

...
else
local contents= file:read("*a")
print(contents)
--io.close(file)
end
contents is a local variable in your else statement.
Outside of it, contents is nil.
dataset = {}
for line in io.lines(iknn_data) do
dataset[#dataset+1] = (contents)
So dataset[#dataset+1]= (contents) is equivalent to dataset[#dataset+1]= nil
Within that generic for loop, line contains the line read from the file. So actually you should work with that.