Referencing parts of vectors and arrays

[gshockxcc]

When using Submatrix, is there a shortcut to specify the end of the column or end of the row?  

[ttokoro]

[gshockxcc]

This is also very helpful, because I didn't know that I could get the size of the rows and columns independently.  Much appreciated.

[Werner_E · Accepted solution]

Are you looking for something like this:

[gshockxcc]

Yes, this is exactly what I'm looking for.  The size of the matrix and submatrix will change, but I often want to pick the starting row and column and select the entire column or row, respectively.