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CASIO INTERACTIVE MATRIX ROW OPERATIONS This is a program for the Casio Cfx9850 Plus that does individual row operations on matrices This program and its companion program for the TI82/83 were written as aids in teaching students the method of doing Gauss and GaussJordan elimination without the confusion of two different calculators and without getting students bogged down in arithmetic. The student selects the type of row operation from a menu and then tells the calculator what multiplier and/or what rows are involved. The calculator displays the matrix (matrix A is used) with the completed operations. Although the syntax of this program is different from the program for the TI83, what the user sees within the program will be very similar with the two calculators. So the instructor/tutor can use this when teaching a group that has both types of calculators. What's new in V1.1? I have included a menu item, #5, that allows multiplying two rows by a constant and then adding the rows. This is convenient for avoiding fractions. In V1.0, this could be done by using the multiply, *row, and the *row+ functions in sequence, but most students seemed not to recognize that. I have also changed the working matrix from A to B, but the data is still entered into matrix A. SNYTAX NOTE: The symbol => is not equal to or greater than, but is the symbol obtained by [SHIFT], [PRGM],[F3],[F3]. The symbol ∆ is not a triangle, but the symbol obtained by [SHIFT], [PRGM],[F3]. DISCLAIMER: This program is free, and, therefore, I make no claims about it's efficacy, efficiency, or proper operation. If you find a problem with this program, or can suggest an improvement, please email me at knosummath@aol.com . Memory Usage: This program uses 433 bytes of memory. I estimate it will take an inexperienced programmer about 20 minutes to enter this program by hand. Use of this Program: You may use this program freely for your own personal use and for the use of other students, but use for publication or any means of profit requires my permission. Enter the following for the program:
Now, let's do a matrix to make sure everything is okay. NOTE: We're not going to try to develop any clever strategy on this matrix. To minimize error propagation, we're are going to try to avoid fractions as long as possible. The format for my "shorthand" instructions will be this order; menu item number, multiplier, first row, second row. If you get mixed up, start over by using menu item 6. That'll restore the original matrix in [B]. Alternatively, from the beginning, you could enter the matrix in [C]; then transfer it to [A] using these commands from the home screen: SHIFT; PRGM; F2;F1;ALPHA, C,® F1;A. Then if you get mixed up you can start over just by transferring from [C] to [A] again. Enter this matrix in [A]: [ 2 1 2 1] (Read the instructions down the left side; then down the right.)
If you want to convert the answers to fractions, do the following: Last Revised: 10/27/09
