Controller routing question

[eluser]Matrices[/eluser]
You can use your uri segments to pass information not only to a controller, but to a view file as well (or any file for that matter).

By calling the uri class, you can grab a variable stored in your url instead of doing something else like passing it through a form. I'm not quite sure what your question is, but I hope this clears up why CI doesn't throw an error when you don't assign a uri segment to be passed through a controller function.

For more info on uri segments go here.