CASTI-89 TITANIUM · CALC89
ref(
Returns the row echelon form of a matrix, the result of forward Gaussian elimination.
Syntax
ref(expr)
- Group
- Matrix
- Arguments
- Takes one matrix.
- Availability
- Included
- Menu path
- MATH ▸ Matrix ▸ CAS ▸ ref(
Example
| Input | Result |
|---|---|
| ref([[2,4,6][1,1,1]]) | [[1,2,3][0,1,2]] |
Typing ref([[2,4,6][1,1,1]]) on the home screen and pressing ENTER returns [[1,2,3][0,1,2]].
Keystrokes on the TI-89 Titanium
2NDMATH4▶×35
The same key sequence inserts ref( in Calc89, and the AI tutor shows it step by step on the on-screen keypad.
Related commands
- rowAdd(Adds one row of a matrix to another row and returns the new matrix.
- rowDim(Returns the number of rows of a matrix.
- rowNorm(Returns the row norm of a matrix, the largest sum of the absolute values of the entries in any row.
- rowSwap(Swaps two rows of a matrix and returns the new matrix.
- rref(Returns the reduced row echelon form of a matrix.
- simult(Solves a system of linear equations given as a coefficient matrix and a column of constants, and returns the solution as a column vector.
- subMat(Returns the part of a matrix between a start row and column and an end row and column.
- trace(Returns the trace of a square matrix, the sum of the entries on its main diagonal.