C#•8mo ago

✅ Reading matricies to an output file

I am trying to read the data inside two matricies from an input file firstly in order to add them together and display the result to the output file. Before I get to that, I am struggling trying to get the program to read each row and column. Here's the block of code with my errors

 //going through each row to get matrix numbers
 while (!reader.EndOfStream)
 {

     nextLine = reader.ReadLine().Split(new char[] { ' ', '\t' }, StringSplitOptions.RemoveEmptyEntries);
     if (nextLine.Length == numOfColumns)
     {
         for (int j = 0; j < numOfColumns; j++)
         {

             a[rowIndex, j] = int.Parse(nextLine[j]);

         }

         rowIndex++;


     }
 }

 //going through each row to get matrix numbers
 while (!reader.EndOfStream)
 {

     nextLine = reader.ReadLine().Split(new char[] { ' ', '\t' }, StringSplitOptions.RemoveEmptyEntries);
     if (nextLine.Length == numOfColumns)
     {
         for (int j = 0; j < numOfColumns; j++)
         {

             a[rowIndex, j] = int.Parse(nextLine[j]);

         }

         rowIndex++;


     }
 }

I have a red line where it says " a[rowIndex, j] = int.Parse(nextLine[j]); and the error reads "Cannot apply indexing [] to an expression of type "Matrix.Matricies."

5 Replies

Dinny•8mo ago

ok so i’ve gotta rid of the red line, but now it’s u def the “int.Parse(nextLine[j])” except i replaced the Parce() with Convert.ToUint32

life grinder•8mo ago

so a is a what? data is what?

Esa•8mo ago

This usually works well enough for me:

const string path = "C:/path/to/file.csv"; // path to your file
const char delimiter = ','; //  insert your actual delimiter here

File.ReadAllLines(path)
    .Select(row => row.Split(delimiter, StringSplitOptions.RemoveEmptyEntries))
    .Select(columns =>
    {
        // Normally I add explicit validation, but for a quick and naive approach this works
        int? column1 = int.TryParse(columns[0], out int result0) ? result0 : null;
        int? column2 = int.TryParse(columns[1], out int result1) ? result1 : null;
        int? column3 = int.TryParse(columns[2], out int result2) ? result2 : null;

        // execute your logic in here
        return "ok";
    });

const string path = "C:/path/to/file.csv"; // path to your file
const char delimiter = ','; //  insert your actual delimiter here

File.ReadAllLines(path)
    .Select(row => row.Split(delimiter, StringSplitOptions.RemoveEmptyEntries))
    .Select(columns =>
    {
        // Normally I add explicit validation, but for a quick and naive approach this works
        int? column1 = int.TryParse(columns[0], out int result0) ? result0 : null;
        int? column2 = int.TryParse(columns[1], out int result1) ? result1 : null;
        int? column3 = int.TryParse(columns[2], out int result2) ? result2 : null;

        // execute your logic in here
        return "ok";
    });

Accord•8mo ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

Unknown User•8mo ago

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✅ Reading matricies to an output file