The common way to report a bug or typo is to click ‘Get Unstuck’ but that button does not appear on this page.
Under the R matrices section it says
To access a single element inside a matrix called
ex_matrix, you can look up the item in the
rth row and the
cth column like so:
To access the entire
rth row, you can refer to it like so:
ex_matrix[r, c]. To access the
cth column, use
ex_matrix[ , c].
I think it has it backwards - ‘ex_matrix[r, c]’ accesses a single element and ex_matrix[r, ] grabs the entire row.
Which is correct?