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26

Discovering Algebra Calculator Notes for the Texas Instruments TI-83 and TI-83/84 Plus

©2007 Key Curriculum Press

Note 1N • Adding/Subtracting Matrices (continued)

TI-83 and TI-83/84 Plus

On a clear Home screen, enter 

[B]

[C]

and press 

. The matrix showing

on the screen is the sum of

[B]

and 

[C]

.

Errors

If you get 

ERR:DIM MISMATCH

, you’ve  tried to add (or subtract) two matrices

that don’t have the same dimensions.

An 

ERR:UNDEFINED

message probably indicates that you have named a matrix

that is not defined.

Note 1P • Multiplying Two Matrices

To multiply two matrices, the number of columns in the first matrix must
match the number of rows in the second matrix. For example, if the first matrix
has dimensions 1 

3 and the second matrix has dimensions 3 

2, the three

columns of the first matrix match the three rows of the second. The
multiplication will be defined.

Enter 

[D]

and 

[C]

as shown in the screens here. (See Note 1L.)

Display 

[D] [C]

(or 

[D] 

*

[C]

) on the Home screen and press 

. The product

appears on the screen. The dimensions of the product are (the number of rows
of the first matrix
)

(the number of columns of the second matrix). In this

example, a 

3

matrix times a 

2

matrix has a 

2

answer.

Errors

If you get 

ERR:DIM MISMATCH

, then the number of columns in the first matrix

does not match the number of rows in the second.

An 

ERR:UNDEFINED

message probably indicates that you have named a matrix

that is not defined.

ENTER

ENTER

DA2CN_773_01.qxd  10/19/05  9:53  Page 26

Summary of Contents for TI-83 - Plus Graphing Calculator

Page 1: ...er to other ways in which numbers are displayed FLOAT mode is useful in hiding long decimal answers and will make some numbers clearer It is best to leave this setting on FLOAT except in applications...

Page 2: ...80 480 into a list a Press Edit b Enter each number into list L1 If you do not see list L1 see the sections Resetting a List or Recalling a List that follow After entering each data value press When y...

Page 3: ...us orTI 84 Plus To delete a list press MEM select 2 Mem Mgnt Del and then 4 List arrow to the list you want to delete and press You can delete a pre set list or a named list If you delete a list you l...

Page 4: ...1 or L2 and so on and The name is back but not the data You can recall all deleted pre set list names by using the Resetting a List procedure To recall a previously named list that was hidden from vie...

Page 5: ...uses the same data as the first list entered in Note 1B a Press LIST and arrow over to MATH b Choose 4 Median or 3 Mean c Press L1 or whichever list contains the data and close the parentheses d Press...

Page 6: ...ist name the calculator default will be list L1 If you get ERR INVALID DIM you have selected a blank list Note 1D Box Plots Entering the Data Enter the data set into a list List L1 is used for this ex...

Page 7: ...ot Press The trace option allows you to see the five number summary values for the box plot by pressing the left and right arrows If you press the up and down arrows you move from one box plot to anot...

Page 8: ...greater than the maximum of the data Xscl the width of each bar Use an integer value that is approximately equal to Xmax 8 Xmin Ymin 2 Using a negative value for Ymin allows you to trace on the graph...

Page 9: ...n if you can t see them in the current window Be sure to turn off any plots and any equations you do not want to see or trace Errors You will get ERR STAT if you try to create a histogram with more th...

Page 10: ...n or equal to Ymax 1 0 Ymin If your Yscl value is too small the y axis will appear too thick Xres 1 This number does not affect a scatter plot Displaying the Scatter Plot a Clear or turn off any equat...

Page 11: ...ridOff Press and check that the calculator is set to Func Clean up When you are finished graphing scatter plots you might want to turn off all the plots so that they don t interfere with other graphin...

Page 12: ...lect Full Press FORMAT and select GridOff Press STAT PLOT PlotsOff or press arrow to any plot that is turned on and press PROGRAM POINTS 3 W Lbl 1 Full PlotsOff FnOff GridOn randInt 9 9 1 2 L randInt...

Page 13: ...s c Select On xyLine L1 for Xlist if your x coordinates are in list L1 L2 for Ylist if your y coordinates are in list L2 and choose a mark type to indicate the data points d Press If the points are no...

Page 14: ...to use this Note If you have a TI 83 and a CBR see Note 1I below You will need a CBR Calculator Based Ranger Connect the CBR to the calculator Press and select EasyData The CBR will immediately begin...

Page 15: ...ry changing the batteries in the CBR Note 1J Equations To graph an equation on your calculator the equation must be in the form y some expression If the equation contains variables other than x and y...

Page 16: ...ots Press STAT PLOT PlotsOff or press arrow to any plot that is highlighted and press If you see ERR SYNTAX check your equation and count the number of left and right parentheses to make sure they mat...

Page 17: ...remove the list values Errors You will get an error if you clear a list that is used in defining a formula generated list Select 2 Goto and press Note 1L Matrices The matrix menu allows you to work w...

Page 18: ...reen press Press to display the actual matrix If you want a matrix to represent money you can set the calculator so that all numbers show two decimal places Press and change the setting on the second...

Page 19: ...he number For example if A is the matrix from Note 1L to multiply A by 50 enter 50 A or 50 A on the Home screen and press The matrix answer appears on the screen Multiplying a number by a matrix A 50...

Page 20: ...ows in the second matrix For example if the first matrix has dimensions 1 3 and the second matrix has dimensions 3 2 the three columns of the first matrix match the three rows of the second The multip...

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