E-CodeMatrix toolkit: det, inverse, product, power, transpose — a TI-84 Plus CE program
MATTOOL is a TI-BASIC program for the TI-84 Plus CE. Type matrices row by row (up to 4×4): determinant and inverse (or SINGULAR), the product A·B, a power A^k, or the transpose — each result shown row by row as C11=, C12=, …
What it asks for and what it shows
It asks for 4 values at its prompts, after you pick option 1 from its menu. In the example below it shows DET, C11, C12, C21, C22.
Example run
One of its oracle test cases: “2x2 det and inverse”. The inputs are typed in order, and the results are the values the case expects on the screen.
| Step | Value |
|---|---|
| You enter | |
| Menu | option 1 |
| Input 1 | 2 |
| Input 2 | 2 |
| Input 3 | {4,7} |
| Input 4 | {2,6} |
| The screen shows | |
DET= | 10 |
C11= | 0.6 |
C12= | -0.7 |
C21= | -0.2 |
C22= | 0.4 |
How it's checked
7 test cases, each checked against an independent method. Replayed key by key on a virtual TI-84 Plus CE, they make 46 checks.
How E-Code checks every program
Run it or put it on your calculator
- Open the library in the TI-84 Plus CE calculator and pick “Matrix toolkit: det, inverse, product, power, transpose” (MATTOOL).
- Put it on your own calculator with a computer and a USB cable, or type it in by hand.
Related programs
- Linear system solver (n equations)
- Eigenvalues and eigenvectors (2×2, 3×3)
- LU decomposition with partial pivoting
- Vectors: dot, cross, angle, projection
- Quadratic formula solver
All TI-84 Plus CE math programs · All TI-84 Plus CE programs