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Casio fx-7400G PLUS Instruction Manual
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Casio fx-7400G PLUS Instruction Manual

Casio fx-7400G PLUS Instruction Manual

Chapter 4 - graphing
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Chapter
4
Graphing
A collection of versatile graphing tools plus a large 79 × 47-dot
display makes it easy to draw a variety of function graphs quickly
and easily. This calculator is capable of drawing the following types
of graphs.
• Rectangular coordinate (Y =) graphs
• Parametric graphs
• Inequality graphs
• A selection of graph commands also makes it possible to incorpo-
rate graphing into programs.
1. Before Trying to Draw a Graph
2. View Window (V-Window) Settings
3. Graph Function Operations
4. Drawing Graphs Manually
5. Other Graphing Functions

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Summary of Contents for Casio fx-7400G PLUS

  • Page 1 Chapter Graphing A collection of versatile graphing tools plus a large 79 × 47-dot display makes it easy to draw a variety of function graphs quickly and easily. This calculator is capable of drawing the following types of graphs. • Rectangular coordinate (Y =) graphs •...

  • Page 2: Before Trying To Draw A Graph

    Chapter 4 Graphing 1. Before Trying to Draw a Graph k k k k k Entering the Graph Mode On the Main Menu, select the GRAPH icon and enter the GRAPH Mode. When you do, the Graph Function (G-Func) menu appears on the display. You can use this menu to store, edit, and recall functions and to draw their graphs.
  • Page 3 Graphing Chapter 4 2. Input a value for a parameter and press w. The calculator automatically selects the next parameter for input. • You can also select a parameter using the c and f keys. Ymin ....Minimum -axis value Ymax ....
  • Page 4 Chapter 4 Graphing 4. To exit the View Window, press Q. • Pressing w without inputting any value also exits the View Window. • The following is the input range for View Window parameters. –9.99E+97 to 9.999E+97 • You can input parameter values up to 7 digits long. Values greater than 10 less than 10 , are automatically converted to a 4-digit mantissa (including nega- tive sign) plus a 2-digit exponent.
  • Page 5 Graphing Chapter 4 b. Press ! 3 (V-Window) 2 (TRIG) to initialize the View Window to the follow- ing settings. Deg Mode Xmin = –360 Ymin = –1.6 Xmax = 360 Ymax = 1.6 Xscl Yscl = 0.5 Rad Mode Xmin = –6.28318 Xmax = 6.28318...

  • Page 6: Graph Function Operations

    Chapter 4 Graphing 3. Graph Function Operations You can store up to 10 functions in memory. Functions in memory can be edited, recalled, and graphed. The types of functions that can be stored in memory are: rectangular coordinate functions, parametric functions, and inequalities. k k k k k Specifying the Graph Type Before you can store a graph function in memory, you must first specify its graph type.
  • Page 7 Graphing Chapter 4 • You will not be able to store the expression in an area that already contains a parametric function. Select another area to store your expression or delete the existing parametric function first. This also applies when storing inequalities. u u u u u To store a parametric function Example To store the following functions in memory areas Xt2 and Yt2:...
  • Page 8 Chapter 4 Graphing k k k k k Editing Functions in Memory u u u u u To edit a function in memory Example To change the expression in memory area Y1 from – 5 – 3 (Displays cursor.) eeeed (Changes contents.) (Stores new graph function.) u u u u u To delete a function...

  • Page 9: Drawing Graphs Manually

    Graphing Chapter 4 Use the following View Window parameters. Xmin = –5 Ymin = –5 Xmax = 5 Ymax = 5 Xscl Yscl (Select a memory area that contains a function for which you want to specify non-draw.) 1(SEL) (Specify non-draw.) Unhighlights 4(DRAW) or w (Draws the graphs.)
  • Page 10 Chapter 4 Graphing 1 (Y >) ..Y > ) inequality 2 (Y <) ..Y < ) inequality 3 (Y ≥) ..Y > ) inequality 4 (Y ≤) ..Y < ) inequality Press [ to return to the previous menu. u u u u u To graph using rectangular coordinates (Y =) You can graph functions that can be expressed in the format Example...
  • Page 11 Graphing Chapter 4 u u u u u To graph parametric functions You can graph parametric functions that can be expressed in the following format. (X, Y) = ( (T), (T)) Example To graph the following parametric functions: = 7 cos T – 2 cos 3T = 7 sin T –...

  • Page 12: Other Graphing Functions

    Chapter 4 Graphing Example To graph the inequality > – 2 – 6 Use the following View Window parameters. Xmin = –6 Ymin = –10 Xmax = 6 Ymax = 10 Xscl Yscl 1. In the set-up screen, specify the appropriate graph type for F-Type. !Z[1(Y>)Q 2.
  • Page 13 Graphing Chapter 4 k k k k k Trace With trace, you can move a flashing pointer along a graph with the f, c, d, and e cursor keys and obtain readouts of coordinates at each point. The following shows the different types of coordinate readouts produced by trace. •...
  • Page 14 Chapter 4 Graphing • Pressing d and e moves the pointer along the graph. Holding down either key moves the pointer at high speed. 3. Use f and c to move the pointer between the two graphs. 4. Use e to move the pointer to the other intersection. •...
  • Page 15 Graphing Chapter 4 Example To graph – 3, substituting 3, 1, and –1 for the value of A Use the following View Window parameters. Xmin = –5 Ymin = –10 Xmax = 5 Ymax = 10 Xscl Yscl [1(Y =) (Specifies graph type.) aATx-d, ![aA!=d,...
  • Page 16 Chapter 4 Graphing k k k k k Zoom The zoom feature lets you enlarge and reduce a graph on the display. u u u u u Before using zoom Immediately after drawing a graph, press !2 (ZOOM) to display the Zoom Menu. !2(ZOOM) 1 (BOX) ..
  • Page 17 Graphing Chapter 4 2. Press 1 (BOX), and then use the cursor keys (d, e, f, c) to move the pointer to the location of one of the corners of the box you want to draw on the screen. Press w to specify the location of the corner. 1(BOX) 3.
  • Page 18 Chapter 4 Graphing Use the following View Window parameters. Xmin = –8 Ymin = –30 Xmax = 8 Ymax = 30 Xscl Yscl = 10 1. After graphing the functions, press !2 (ZOOM), and the pointer appears on the screen. !2(ZOOM) 2.
  • Page 19 Graphing Chapter 4 • The above procedure automatically converts the -range and -range View Win- dow values to 1/5 of their original settings. • You can repeat the factor zoom procedure more than once to further enlarge or reduce the graph. u u u u u To initialize the zoom factor Press ! 2 (ZOOM) 2 (FACT) 1 (INIT) to initialize the zoom factor to the following settings.
  • Page 20 Chapter 4 Graphing • Other menu items are identical to those in the STAT, GRAPH, TABLE Mode menu. The Sketch function lets you draw lines and plot points on a graph that is already on the screen. All the examples in this section that show operations in the STAT, GRAPH or TABLE Mode are based on the assumption that the following function has already been graphed in the GRAPH Mode.
  • Page 21 Graphing Chapter 4 In the RUN or PRGM Mode The following is the syntax for plotting points in these modes. Plot < -coordinate>, < -coordinate> Example To plot a point at (2, 2) Use the following View Window parameters. Xmin = –5 Ymin = –10...
  • Page 22 Chapter 4 Graphing u u u u u To turn plot points on and off in the STAT, GRAPH and TABLE Modes • To turn a plot point on 1. After drawing a graph, display the sketch menu and then perform the following operation to make the pointer appear at the center of the screen.
  • Page 23 Graphing Chapter 4 u u u u u To draw a line between two plotted points In the STAT, GRAPH or TABLE Mode Example To draw a line between the two points of inflection on the graph + 2)( – 2) Use the same View Window parameters as in the example on page 1.
  • Page 24 Chapter 4 Graphing u u u u u To draw a line in the STAT, GRAPH and TABLE Modes Example To draw a line between two points of inflection on the graph of + 2)( – 2) 1. After graphing the function, display the sketch menu and perform the following operation to cause the pointer to appear on the graph screen.
  • Page 25 Graphing Chapter 4 In the RUN or PRGM Mode Example To draw a line perpendicular to the -axis from point ( ) = (2, 6) on the graph Use the following View Window parameters: Xmin = –2 Ymin = –2 Xmax = 5 Ymax = 10 Xscl...
  • Page 26 Chapter 4 Graphing 2. Use the d and e cursor keys to move the line left and right, and press w to draw the line at the current location. e ~ ew • To draw a horizontal line, simply press 2 (Hztl) in place of 1 (Vert), and use the f and c cursor keys to move the horizontal line on the display.