Steps in solving matrix on my ti 89 calculator.

An argument is of the wrong data type

The calculator is a very advanced one. It has hundreds of commands, each doing something different. Do you honestly think that anybody, no matter how well intentioned, can possibly give you step by step instruction on how to operate the calculator? And for free.

TI publishes just such a guide book. It is freely available on their website at education.ti.com. Download the complete guide book, browse through it to look for the way to solve the problem you are studying. Be focused. Read only what you need, to solve the problem at hand.

However, if you have a more specific question such as how do add two numbers, how do I find the inverse of a matrix, or anything with limited scope, we will be happy to answer it.
Please formulate a question.

You'll get the same error if you try to divide two matrices with real numbers. The TI-89 doesn't allow you to divide a matrix by another. However, you can multiply a matrix by the reciprocal of the other.

For example, to calculate A/B, calculate instead A*B^-1 . Makes sure you use the (-) key just to the right of the decimal point key to put in the negative sign before the "1".

Matrix multiplication is defined only when the width of the first matrix is equal to the height of the second. You can multiply a 2x2 matrix by a 1x2 matrix or multiply a 2x1 matrix by a 2x2 matrix, but you cannot multiply a 2x2 matrix by a 2x1 matrix.

Hi william_kien,

The Ti 89 solves a lot of fraction problems by being in the right mode and, the use of several commands. One of my first problems here at Fixya was to find a solution for, "How do i convert a decimal answer to fractions prefferably with matrixes."

Here the problem was solved just by being in the EXACT mode.

Another fraction nightmare, so I thought was to solve for, "I want to solve a Binomial Theorem problem!" You have to go to the end of the problem but, I solved it just by the use of the expand command.

The best way to display fraction is in Pretty Print and, in the EXACT mode. Here is a small demonstration of the 3 mode setting in the Ti 89 and, the effect of each to the way a fraction is displayed.

This is a demonstration of the Ti 89 simplifying and, displaying in fractional form in the AUTO mode.

This is a demonstration of the Ti 89 making numbers proper and, displaying them in fractional form while in the EXACT mode.

This demonstration of the Ti 89 not even converting in fractional form and, displaying in the APPROX mode.

You should always use parentheses when entering equations or, fractions into the calculator. Pictured just below you can see how the Ti 89 can miss-interpret what is being entered.


The propFrac command is a great tool to reducing to the simplest form.
propFrac(expression,var). This will return an expression as a
proper expression




Sometime with joining or, combining fractions you have to get the common denominator. As you can see below the comDenom command is a great tool for that.


The Ti 89's ability to compute fractions is only limited to the ability and, knowledge of the person using it. Even though, it has a tendency of making a not so, mathematically inclined person look like they have been doing them all there life.

I just gave several ways I go about solving and, displaying fractions. The best way to display fraction is in Pretty Print and, in the EXACT mode. Sometimes that isn't even enough and, you have to use parentheses and, commands to do the job.

It is just a matter of being in EXACT mode. To set your calculator in EXACT mode here's the key sequence. Press [MODE] [F3] [Up Arrow] [Up Arrow] [Right Arrow] [2] [ENTER]. Now when your in the Matrix Editor you can input your numbers in decimal form and, they will be automatically be converted to a fractional format. Pictured below is a matrix that was entered using decimal numbers and, was converted into factional form. Notice at the bottom of the screen the calculator is in EXACT mode.


Here's the same matrix in the HOME screen.



Next is the same matrix converted back to decimal numbers. Notice at the bottom of the screen the calculator is in APPROX mode.



And of course when I turn the calculator back to EXACT mode and, Re-ENTER the decimal formatted matrix in the HOME screen the fractional formatted matrix reappears.

You can use the propFrac( command but, having in the EXACT mode setting works better.

Hello,
To solve Ohm's law you need no sophisticated calculator. If you know two quantities, you readily calculate the third. Application of Kirchhoff's (two h) laws to linear circuits, gives you a linear system of equations. If a calculator can solve linear systems, or handles matrices, the limitations would pertain to the maximum dimension of the matrices.
I just tried the TI83 to define a 45x45 square matrix and a 55x45 matrix. The maximum number of rows or columns is 99. But it will depend on memory.
If you have the TI84PLUS Silver Edition it should be fine. You can upgrade to a TI 89 Platinum, which can handle symbolic calculations (with undefined coefficients a, b, c).
Hope it helps.

Hello,
The so-called (2x1) matrix is not a matrix. It is a vector.
Hope it helps.

use the simultaneous equation solver software available on ur ti-89 and enter the equation in the form of augmented matrix and you will get ur answer.

try hitting the diamond button and then hitting answer after it shows up, it should give you a different outcome than the original. hope that helped.