CASCALC89 COMMAND · NOT ON THE TI-89
inverse(
Returns the inverse of a square matrix, the same result as raising it to the power −1.
Syntax
inverse(expr)
- Group
- Matrix
- Arguments
- Takes one square, invertible matrix.
- Availability
- Included
- Menu path
- MATH ▸ Matrix ▸ CAS ▸ inverse(
- Origin
- TI-Nspire CAS style command; the TI-89 Titanium handheld does not have it
Example
| Input | Result |
|---|---|
| inverse([1,2;3,4]) | [[−2,1][3/2,−1/2]] |
Typing inverse([1,2;3,4]) on the home screen and pressing ENTER returns [[−2,1][3/2,−1/2]].
Keystrokes in Calc89
2NDMATH4▶×32
The sequence above inserts inverse( in Calc89.
Related commands
- list▶mat(Converts a list into a matrix, filling it row by row with the given number of columns.
- LUComputes the LU decomposition of a matrix with partial pivoting and stores the lower, upper and permutation matrices in variables.
- mat▶list(Returns the entries of a matrix as one list, row by row.
- mRow(Multiplies one row of a matrix by a value, one of the elementary row operations of Gaussian elimination.
- mRowAdd(Multiplies one row of a matrix by a value and adds the result to another row, the key step of Gaussian elimination.
- newMat(Returns a matrix of zeros with the given number of rows and columns.
- norm(Returns the Frobenius norm of a matrix; for a vector this is its length.
- QRComputes the QR factorization of a matrix and stores the orthogonal matrix q and the upper triangular matrix r in variables.