Question

I need to loop this loop for all rows and not just the row indexed by 2. Also I am getting an error in the double parsing.

Is there an efficient way to do the following?

The file can have variable lengths of rows. Thus I need to maintain an array to store the size of each row.

 public static void ReadFile()
    {
        int lineNo;
        List<List<double>> numbers = new List<List<double>>();
        foreach (string line in File.ReadAllLines("Data.txt"))
        {
            var list = new List<float>();
            foreach (string s in line.Split(new[]{',', ' '}, StringSplitOptions.RemoveEmptyEntries))
            {
                int i;
                if(double.TryParse(s, out i))
                {
                    list.Add(i);
                    lineNo++;
                }
            }
            numbers.Add(list);
        }

        var specialNumber = numbers[3][4];        // gives line 3 number 4
        var specialLine = numbers[2].ToArray();   //  gives an array of numbers of line 2

        double[] rowTotal;
        double[] squareRowTotal;
        double[] rowMean;

        //I need to loop this loop for all rows and not just the row indexed by 2. Also I am getting an error in the double parsing.

        for (int j=0; j<(specialLine.Length); j++)
        {
            rowTotal[2] = rowTotal[2] + numbers[2][j];
            squareRowTotal[2] = squareRowTotal[2] + numbers[2][j] * numbers[2][j];
        }

        for (int k = 0; k < lineNo; k++)
        {
            rowMean[k] = rowTotal[k] / numbers[k].Length;
        }
    }

Answer 1

    public static void ReadFile()
    {
        List<List<double>> numbers = new List<List<double>>();
        foreach (string line in File.ReadAllLines(@"c:\temp\test.csv"))
        {
            var list = new List<double>();
            foreach (string s in line.Split(new[] { ',', ' ' }, StringSplitOptions.RemoveEmptyEntries))
            {
                double i;
                if (Double.TryParse(s, out i))
                {
                    list.Add(i);
                }
            }
            numbers.Add(list);
        }

        double[] rowTotal = new double[numbers.Count];
        double[] squareRowTotal = new double[numbers.Count];
        double[] rowMean = new double[numbers.Count];

        for(int row = 0; row < numbers.Count; row++)
        {
            var values = numbers[row].ToArray();

            rowTotal[row] = values.Sum();
            squareRowTotal[row] = values.Select(v => v * v).Sum();
            rowMean[row] = rowTotal[row] / rowTotal.Count();
        }
    }