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Instructions

Test suite

Solution

Given a string representing a matrix of numbers, return the rows and columns of that matrix.

So given a string with embedded newlines like:

```
9 8 7
5 3 2
6 6 7
```

representing this matrix:

```
1 2 3
|---------
1 | 9 8 7
2 | 5 3 2
3 | 6 6 7
```

your code should be able to spit out:

- A list of the rows, reading each row left-to-right while moving top-to-bottom across the rows,
- A list of the columns, reading each column top-to-bottom while moving from left-to-right.

The rows for our example matrix:

- 9, 8, 7
- 5, 3, 2
- 6, 6, 7

And its columns:

- 9, 5, 6
- 8, 3, 6
- 7, 2, 7

To run the tests, run the command `dotnet test`

from within the exercise directory.

Initially, only the first test will be enabled. This is to encourage you to solve the exercise one step at a time.
Once you get the first test passing, remove the `Skip`

property from the next test and work on getting that test passing.
Once none of the tests are skipped and they are all passing, you can submit your solution
using `exercism submit Matrix.cs`

For more detailed information about the C# track, including how to get help if you're having trouble, please visit the exercism.io C# language page.

Warmup to the `saddle-points`

warmup. http://jumpstartlab.com

```
// This file was auto-generated based on version 1.1.0 of the canonical data.
using Xunit;
public class MatrixTest
{
[Fact]
public void Extract_row_from_one_number_matrix()
{
var sut = new Matrix("1");
Assert.Equal(new[] { 1 }, sut.Row(1));
}
[Fact(Skip = "Remove to run test")]
public void Can_extract_row()
{
var sut = new Matrix("1 2\n3 4");
Assert.Equal(new[] { 3, 4 }, sut.Row(2));
}
[Fact(Skip = "Remove to run test")]
public void Extract_row_where_numbers_have_different_widths()
{
var sut = new Matrix("1 2\n10 20");
Assert.Equal(new[] { 10, 20 }, sut.Row(2));
}
[Fact(Skip = "Remove to run test")]
public void Can_extract_row_from_non_square_matrix()
{
var sut = new Matrix("1 2 3\n4 5 6\n7 8 9\n8 7 6");
Assert.Equal(new[] { 7, 8, 9 }, sut.Row(3));
}
[Fact(Skip = "Remove to run test")]
public void Extract_column_from_one_number_matrix()
{
var sut = new Matrix("1");
Assert.Equal(new[] { 1 }, sut.Column(1));
}
[Fact(Skip = "Remove to run test")]
public void Can_extract_column()
{
var sut = new Matrix("1 2 3\n4 5 6\n7 8 9");
Assert.Equal(new[] { 3, 6, 9 }, sut.Column(3));
}
[Fact(Skip = "Remove to run test")]
public void Can_extract_column_from_non_square_matrix()
{
var sut = new Matrix("1 2 3\n4 5 6\n7 8 9\n8 7 6");
Assert.Equal(new[] { 3, 6, 9, 6 }, sut.Column(3));
}
[Fact(Skip = "Remove to run test")]
public void Extract_column_where_numbers_have_different_widths()
{
var sut = new Matrix("89 1903 3\n18 3 1\n9 4 800");
Assert.Equal(new[] { 1903, 3, 4 }, sut.Column(2));
}
}
```

```
ï»¿using System;
public class Matrix
{
private int[][] matrix;
public Matrix(string input)
{
var rows = input.Split(new[] { "\n" }, StringSplitOptions.RemoveEmptyEntries);
matrix = new int[rows.Length][];
for(int i = 0; i < rows.Length; i++)
{
matrix[i] = Array.ConvertAll(rows[i].Split(' '), int.Parse);
}
}
public int Rows { get; }
public int Cols { get; }
public int[] Row(int row)
{
return matrix[row -1];
}
public int[] Column(int col)
{
var columnValues = new int[matrix.Length];
for(int i = 0; i < matrix.Length; i++)
{
columnValues[i] = matrix[i][col -1];
}
return columnValues ;
}
}
```

A huge amount can be learned from reading other peopleâ€™s code. This is why we wanted to give exercism users the option of making their solutions public.

Here are some questions to help you reflect on this solution and learn the most from it.

- What compromises have been made?
- Are there new concepts here that you could read more about to improve your understanding?

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