Texas Instruments TI-83 Manual Book page 181

cumSum(
Row Operations
ref(, rref(
returns cumulative sums of the elements in
cumSum(
matrix, starting with the first element. Each element is the
cumulative sum of the column from top to bottom.
matrix
cumSum( )
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MATRX MATH
You can use a row operation in an expression. Row
operations do not change matrix in memory. You can
enter all row numbers and values as expressions. You can
select the matrix from the
(row-echelon form) returns the row-echelon form of a
ref(
real matrix. The number of columns must be greater than
or equal to the number of rows.
matrix
ref( )
(reduced row-echelon form) returns the reduced row-
rref(
echelon form of a real matrix. The number of columns must
be greater than or equal to the number of rows.
matrix
rref( )
through are row operations.
A F
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MATRX NAMES
Matrices 10-15