TI calculator programs.
This program assumes you have two points and will draw lines to those two points for you. So you might have something like "graph the line at points (3,2),(4,6)". The catch is this program is in a loop to allow for multiple lines to be drawn. Just hit 2nd and quit (or exit) to exit the program and then hit GRAPH to view the lines you made. This is also handy if you need to draw a line across an equaltion already in the grapher.
The TI-85s built in solver can solve these types of problems. This program just makes the data entry a little easier.
Ever get stuck trying to determine the absolute, relative, and percent error? This program is for you.
Convert a decimal number to binary and hex. I'm pretty sure I needed this for Discrete Math and I know I haven't used it since.
One of several Trig apps. This one displays how to find the cosecant as well as lets you plug the numbers in for the calculator to solve.
One of my first game programming books was for the Apple ][e. One of the cool BASIC programs in the book was this skiing game. For some reason, it was cool to punch into the computer and entertaining to play. I ported it over to the TI and added obstacles (see 2nd last menu option – by default they are off but you can easily turn them on). Just use the left/right arrow keys to direct your skier. It keeps track of your score and the highest score.
I'm pretty sure there's more productive ways to get rid of the axis and tick marks from within a program. One of my apps needed the axis removed and this program was the brute force result.
Well, it could be used as a clock, but its really setup as a timer right now. A few tweaks here and there and you should be able to use this as a clock. For one reason or another, I didn't finish this app all the way. Hit 2nd then ON to exit it. Modify the 350 at line 11 to suit your needs of you calculator (may require some fiddling).
Use this app to center your text on the TI (default is 40 characters across). Modify the 40 at line 10 to suit your calculator or even your computer. If you are creating an ASCII application on your PC, set it to 80.
This app attempts to calculate loan information. You will want to modify this one so it fits your needs. It doesn't have a way to input the interest rate. To change it, just modify this line: (FP)/(79/100)\->\MP and change the (79/100) to the desired interest rate.
This program I believe was used for Discrete Math. It calculates the decimal representation of a binary decimal number. I believe the TI-85 can do this natively, but this app was built to reduce data entry issues and reduce key presses to switch from DEC to BIN and then back. It asks for the length of the string as well which allows it to account for 0 place holders.
A very simple example of graph animation. A "ball" (really its just a line) goes back and forth.
Amuse your friends with this one. Ask a question out loud (or quietly if you are shy) and your TI will give you an answer. The name is misspelled on purpose.
Pythagorean theorem is awesome when you're working with right triangles, but pre-calculus doesn't just limit the triangles to right triangles. So this program excepts any 3 parts of a triangle. Be it 3 sides, 2 sides and an angle, or 2 angles and a side. The order you enter them in doesn't matter. In fact, the program is geared to allow you to input the known values as easily as possible. Once entered, the program will find the missing pieces. If the triangle has two solutions, it'll provide both solutions as well. The program also calculates the perimeter (sorry, didn't have time to add area to the program). The input is not validated. Entering 3 of the same pieces or 3 angles will cause the program to choke. After the result has been displayed, press Home to exit or press Enter to solve another triangle.
Continue reading “TriSolve – Finding the missing triangle pieces”
Find the area under a curve or graph. Enter an equation, the lower bound, upper bound, and the number of iterations or "boxes." SumArea then shows its work. It provides delta x (or the width of the boxes), the calculations for right end points, left end points, and middle points. SumArea pauses often to allow review of the data (press Enter to continue or ON to exit). After hitting pause a few times, look for the line with "= [number]" – this line is the sum (aka: the answer) for the calculation in progress.
You'll need to use a TI font (such as TI-92 Mini Sans) to view on your PC. But in theory, may transfer over without problems on to other TIs (such as TI-85,83,82,etc). Just copy the text (with all the goofy characters) over to the TI GraphLink Program Editor and save it as a program (it won't run so you'll need to go to Program Edit on your calculator)
Pre-Calc Trig Formulas (TI-89 text file)
Here's another one of my favorite apps. Its gotten a lot of mileage and originally started out on a TI-81. It asks for X1, Y1, X2, Y2 which is typically in a text book as (X1, Y1), (X2, Y2). Plop the 2 coordinates in and it tells you the slope (M), distance between the two points, and the X and Y intercepts (if available).
Give it A, B, and C and it spews out all sorts of nifty info regarding the equation. This app was originally done on a TI-81 and perfected over time. If its a valid equation producing two real numbers, then it will let you know if its a parabola and if it opens up or down as well as the exact points it crosses the X axis and the vertex point.
