csvigo: a package to handle CSV files (read and write).

Install:

First install Torch7 (www.torch.ch) then simply install this package using luarocks:

luarocks install csvigo

Use:

The library provides 2 high-level functions: csvigo.load and csvigo.save. To get help on these functions, simply do:

> csvigo.save()
> csvigo.load()

Loading a CSV file in 'query' mode gives you a convenient query function that you can use to query subsets of your original CSV file. To get help on this query function, simply do:

> query = csvigo.load{path='somefile.csv', mode='query'}
> query('help')
-- print some help
> all = query('all')
> subset = query('union', {somevar=someval, someothervar={val1, val2}})

Large CSV mode

CSVigo supports efficient loading of very large CSV files into memory. The loaded data structure is a read-only table with efficiency hidden under the hood.

Loading:

m=csvigo.load({path="my_large.csv", mode="large"})

Printing by default only prints first 10 and last 10 rows

print(m)

Individual element access

print(m[32])

Size of table:

print(#m)

For loop over entries:

Type 1:

fori=1, #mdoprint(m[i]) -- get elementend

Type 2:

fork,vinipairs(m) doprint(k)
print(v)
end

Type 3:

fork,vinpairs(m) doprint(k)
print(v)
end

Read-only table

-- read only table, will error here:m[13] ='a'