# Calculator Notes for the TI-Nspire and TI-Nspire CAS

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1 CHAPTER 4 Calculator Notes for the Note 4A: Function Notation The handheld uses function notation automatically. You can define a function in the Calculator, Graphs & Geometry, and Data & Statistics applications. See Note 3A to learn how to define a function. You can have up to 99 functions defined in any problem, f 1 (x) to f 99 (x). To calculate the value of the function for a given x-value, replace the x in the function with that x-value. For example, suppose you have defined f 1 (x) x 2 3 and f 2 (x) 3x 1. To evaluate each of the functions when x is 4, type f1(4) and press, then type f 2(4) and press. Notice that a defined function turns bold when you type it. Note 4B: Entering Programs The handheld can be programmed like a computer. In the Calculator application, you can instruct the handheld to perform a series of calculations. This series of calculations can be stored as a program that can be used temporarily or on a regular basis. Programming is a process that takes much time to master. These instructions show you how to enter prewritten programs into the handheld. Manually Entering a Program Go to a Calculator page or add a new Calculator page by pressing c and choosing Calculator. To enter the program, press b and choose Functions & Programs Program Editor New. Type the name of the program, for example, hello. If you want to be able to use this program in any document, see Running Programs Anytime Using the Public Library in this note. Press. Next, type the program exactly as it appears in the source you are copying. Press to add a new line to the program, and press _ to add a space. You can type commands or choose them from the catalog. (Press k and scroll through the list. Press a letter to jump to that part of the list.) When you are finished typing the program, press b and choose Check Syntax & Store Check Syntax & Store. The handheld checks the program for certain types of mistakes and then stores the program. If the handheld finds an error, it notifies you of the error and (after you press ) takes the cursor to it. Not all errors are found by this process, so make sure you type the program exactly as it appears in your source. Discovering Advanced Algebra Calculator Notes for the Texas Instruments CHAPTER 4 39

2 Note 4B: Entering Programs To run the program, press /e to go to the left side of the screen. Type the program name and press. Using the example program, you can type hello(3) to display hello three times. This program will run in any Calculator page in the current document. Running Programs Anytime Using the Public Library To enter a program that can be run in any document, press c and choose New Document. Add a Calculator page. To enter the program, press b and choose Functions & Programs Program Editor New. Type the name of the program, for example, hi. Then press e twice, press a, and choose LibPub (Show in Catalog) from the menu that appears. Press twice. Notice that this program looks nearly identical to the hello program, but the word LibPub appears in the first line. This allows this program to be accessed at any time. After you have entered the program, press /S, give the document a name, such as math, and save it in the folder MyLib. To update all the programs the handheld can use, press /c and choose Refresh Libraries. To run the hi program in a different document, open a new or saved document and go to a Calculator page. Press k5 and choose math hi. Type the number of times you want the program to display hi and press. 40 CHAPTER 4 Discovering Advanced Algebra Calculator Notes for the Texas Instruments

3 Note 4B: Entering Programs If you plan on having many programs on your handheld, consider keeping several of them in one document. Type each program on a separate page of the same document. Here the hi program and the quad program are both saved in the math document. Transferring a Program Between Handhelds To transfer a program between handhelds, see Note 1H. Note 4C: Movin Around You will need two CBR2s. With bits of tape, label the CBR2s A and B. Label two handhelds A and B. On each handheld, open a new document by pressing c and choosing New Document. Connect each handheld to its corresponding CBR2 (A to A, B to B). The data collection console should launch automatically. Choose Lists & Spreadsheet and click OK. You will see a Lists & Spreadsheet page, with a Dist meter. The meter will be reading the current value of the CBR2. Press b and choose Experiment Set Up Collection Time Graph. Enter these values. Follow the directions in the investigation to collect the data. To start collecting data, press a to press the Play button on the meter. Data collection will stop automatically after 10 seconds. The handheld collects four lists: time is stored in dc01.time, distance is stored in dc01.dist1, velocity is stored in dc01.vel1, and acceleration is stored in dc01.acc1. Check your data by making a scatter plot of the (dc01.time, dc01.dist1) data. See Note 1F if you need help making a scatter plot. You can close the data collection console by pressing until you highlight the Close button and then pressing a. Discovering Advanced Algebra Calculator Notes for the Texas Instruments CHAPTER 4 41

5 Note 4D: Setting Windows by pressing b and choosing Window Zoom Square. The handheld will find the nearest square window. To verify that a window is square, look at the scale factors on the x- and y-axes. They should be the same. Sometimes when you trace a graph you would like only nice decimal values to be displayed. You can control how far the trace jumps on the x-axis to display nice decimals for the x-values. The y-values of a function may or may not be nice decimal values. To do this, press b and choose Trace Trace Settings. Press a and choose Enter Value. Type the value you want to jump by, such as 0.1, and press. Now when you trace, you will see nice decimal values. Note 4E: Graphing Piecewise Functions You can graph piecewise functions in the Graphs & Geometry application. If a Graphs & Geometry page is not open, press c and choose Graphs & Geometry. In the entry line, press /r. The piecewise icon that shows two pieces opens a template that always creates a two-piece piecewise function. The piecewise icon that shows three pieces allows you to choose how many pieces you want in the piecewise function. Use the NavPad to select the three-piece icon and press a. Enter the number of pieces you want in the function and press. In each line of the piecewise function template, type the expression of the function, press, and then type the domain of the function using the inequality keys. Note that there are gray buttons for the greater than and less than signs. Press /> to enter the sign or /< to enter the sign. To advance to the next line of the piecewise function, press. Discovering Advanced Algebra Calculator Notes for the Texas Instruments CHAPTER 4 43

6 Note 4E: Graphing Piecewise Functions When you are finished, press to graph the piecewise function. Notice that the handheld does not display the open circles and closed dots at the end of the intervals. Note 4F: Graphing Absolute-Value Functions You can graph absolute-value functions in the Graphs & Geometry application. If a Graphs & Geometry page is not open, press c and choose Graphs & Geometry. There are two ways to enter an absolute-value function in the entry line. 1. Type abs( and then the number, variable, or expression to graph. Press ) to exit the absolute-value function. 2. Press /r. Use the NavPad to select the absolute-value icon, and press. Type the number, variable, or expression in the absolute-value template. Press to exit the absolute-value function. When you are finished inputting the function, press to graph it. 44 CHAPTER 4 Discovering Advanced Algebra Calculator Notes for the Texas Instruments

7 Note 4G: Graphing Transformations You can translate and dilate certain functions in the Graphs & Geometry application. The functions that the handheld can transform are y x, y x 2, y e x, y ln(x), y sin(x), and y cos(x). You might be familiar only with y x and y x 2, but you may use some of the other functions in this course. Graph the function you want to transform. See Note 3A if you need help graphing a function. Use the NavPad to hover the cursor over the graph. Two different cursors will appear. The four-directional arrow appears when you hover over the center of the graph; it translates the graph. The twodirectional arrow appears when you hover over the rest of the graph; it dilates the graph of the function. When either one of these cursors appears on the graph, press /a and use the NavPad to transform the graph. Press d to put the transformation tool away. Notice that the equation of the function updates while you perform the transformations. Note 4H: Transformations and Compositions You can use the name of any defined function in other functions to show transformations and to construct compositions. Transformations of Functions You can enter an equation into the entry line of a Graphs & Geometry or a Calculator page and then define a second equation as a transformation of the first. For example, enter f1(x) = 4 x 2 and then define f 2(x) = 3 f1(x 4) + 2. The function f 2 (x) is the image of f 1 (x) after being translated right 4 units, dilated vertically by a factor of 3, and translated up 2 units. Discovering Advanced Algebra Calculator Notes for the Texas Instruments CHAPTER 4 45

8 Note 4H: Transformations and Compositions Compositions of Functions If you define two or more equations in a Graphs & Geometry or Calculator page, you can define another equation as the composition of the equations you have entered. For example, define f1(x) = 4 x 2 and f3(x) = x + 5. You can then define f4(x) = f1(f3(x)). You can perform a recursive composition in the Calculator application to evaluate the repeated composition of a function with itself. Perform the first iteration by typing the initial value in the parentheses of the function. Then enter Ans for the x-value by pressing /v. For example, to perform a recursive composition with f 3 (x) x 5 and initial value 4, type f3( 4), and press. Type f3( and press /v. Then press to find each successive term. Note 4I: Drawing Segments If you are not currently in a Graphs & Geometry page, press c and choose Graphs & Geometry. To draw a segment, press b and choose Points & Lines Segment. Use the NavPad to move to one endpoint and press a. At this point, you can optionally type in a label using the green keys. Use the 46 CHAPTER 4 Discovering Advanced Algebra Calculator Notes for the Texas Instruments

9 Note 4I: Drawing Segments NavPad to move to the other endpoint and press a. At this point, you can optionally type in a label using the green keys. Repeat the process to draw another segment. When you are done, press d to put away the segment tool. To label the endpoints with coordinates, press b and choose Actions Coordinates and Equations. Use the NavPad to point at the endpoint of the segment, press a to choose the endpoint, and press a again to fix the coordinates on the screen. Press d to put away the tool. To change the number of digits shown for the coordinates, use the NavPad to move over the coordinate and press + to increase the number of digits and - to decrease the number of digits. To move a point, press /a to grab the point, and use the NavPad. When you are done, press d to release the point. You can also press a twice on a coordinate, type the new value, and press. If you would like to hide the Cartesian coordinate plane and entry line, press b and choose View Plane Geometry View. Discovering Advanced Algebra Calculator Notes for the Texas Instruments CHAPTER 4 47

10 Note 4J: Web Graphs To create a web graph, you first need to create a sequence for the function in a Lists & Spreadsheet page. Enter the function rule as the sequence using u n 1 in place of x. See Note 1I for more information on creating sequences. Enter the program from the next page in the program editor. See Note 4B if you need help entering the program. To run the program, in the Calculator application type web( and the name of the sequence list you created. The program creates two lists, wx and wy, which represent the x- and y-coordinates of the web graph. The examples show creating a web graph for the function f (x) 4x (1 x). Open a Graphs & Geometry page, and create a scatter plot using lists wx and wy. Press b and choose Window Zoom Data. To connect the dots, press b and choose Actions Attributes. Move the NavPad over the points, and press a a. Graph the function you created the web graph for as well as f (x) x. Press /G to hide the entry line. Finally, move along the scatter plot by pressing b and choosing Trace Graph Trace. If the cursor is not on a point of the scatter plot, press or until it is. Press until you are sure you are at the initial point. Press to move from point to point. 48 CHAPTER 4 Discovering Advanced Algebra Calculator Notes for the Texas Instruments

11 Note 4J: Web Graphs Program Define web(seqlist)= Prgm mid(seqlist,1,1) wx {0} wy For k,1,dim(seqlist)-1 augment(wx,mid(seqlist,k,1)) wx augment(wy,mid(seqlist,k+1,1)) wy augment(wx,mid(seqlist,k+1,1)) wx augment(wy,mid(seqlist,k+1,1)) wy EndFor EndPrgm Discovering Advanced Algebra Calculator Notes for the Texas Instruments CHAPTER 4 49

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