My csv files can have changing number of columns

[heisenbuug]

Hey. I was exploring this repo. So I want to read a .csv file and store its content into an arma::mat.

I have 3 files with 5, 15, 25 columns. I don't want to do this

  io::CSVReader<5> doc5("data/electricity-usage5.csv");
  io::CSVReader<5> doc15("data/electricity-usage15.csv");
  io::CSVReader<5> doc25("data/electricity-usage25.csv");

I want something like

arma::Col<unsigned> colu = {5, 15, 25};
for(int i = 0; i <3; i++)
{
    const unsigned a = col_sizes(i);
    io::CSVReader<a> doc("data/electricity-usage.csv");
}

But this is giving me an error.

Also is it compulsory to initialize with a number of columns? What if I don't know how many columns does the .csv file has. Also is there a way to read data column-wise? And if I have 25 columns, how will I read the whole row at once?

Thank you for the help.