Texas Instruments TI-73 Software Manual page 38

ref(, rref( A: and B: Row-echelon and Reduced
Row-echelon Forms
returns the row-echelon form of a real matrixname . The
ref(
number of columns must be greater than or equal to the number
of rows.
ref( matrixname
returns the reduced row-echelon form of a real matrixname .
rref(
The number of columns must be greater than or equal to the
number of rows.
matrixname
rref(
Matrices for the TI-73
)
)
... indicates that the
result extends beyond
the screen. To scroll the
result right or left, press
" or ! at any time
before you perform the
next calculation.
Page 38