[Solved] C# – float[][] declaration

Well, there are two different types:

• Array of array (jagged array):

  float[][] sample = new float[][] {
    new float[] {1, 2, 3},
    new float[] {4, 5}, // notice that lines are not necessary of the same length
  };
  

• 2d array:

  float[,] sample2 = new float[,] {
    {1, 2, 3},
    {4, 5, 6},
  };
  

Edit: your code amended:

  // jagged array (10 arrays each of which has 5 items)
  float[][] inputs = new float[10][] {
    new float[5],
    new float[5],
    new float[5],
    new float[5],
    new float[5],
    new float[5],
    new float[5],
    new float[5],
    new float[5],
    new float[5],
  };

You can shorten the declaration with a help of Linq:

  float[][] inputs = Enumerable
    .Range(0, 10)               // 10 items
    .Select(i => new float[5])  // each of which is 5 items array of float
    .ToArray();                 // materialized as array

Or in case of 2d array

  // 2d array 10x5
  float[,] inputs = new float[10,5];