Cannot apply indexing with [] to an expression of type `object'

Question

Here is my code: An ArrayList of ArrayList that returns a float:

public ArrayList walls=new ArrayList(); 

public void Start()
{
    walls[0         


        

Answer 1

Where are you doing the casting?

I would say it must be (did not try with a compiler):

for (int i = 0; i < paredes.Length; i++)
{           
    float a=(float)((ArrayList)paredes[i])[0];
    ...                   
}

Did you consider using the generic collections instead?

public List> paredes = new List>();