HP 48gII hp 48gII_user's manual_English_E_HDPMSG48E67_V2.pdf - Page 733

'1+SIN EQ@@ @)PPAR { θ 0 6.29} ` @INDEP ~y` @DEPND 3 \# 3 @XRNG 0.5 \# 2.5 @YRNG L { (0,0) {.5 .5} "x" "y"} ` @AXES L @)PLOT @ERASE @DRAX L @LABEL L @DRAW @)EDIT L@MENU LL@)PICT @CANCL Store complex funct. r = f(θ) into EQ Show plot parameters Define 'θ' as the indep. Variable Define 'Y' as the dependent variable Define (-3,3) as the x-range Define (-0.5,2.5) as the y-range Axes definition list Define axes center, ticks, labels Return to PLOT menu Erase picture, draw axes, labels Draw function and show picture Remove menu labels Return to normal calculator display From these examples we see a pattern for the interactive generation of a twodimensional graph through the PLOT menu: 1 - Select PTYPE. 2 - Store function to plot in variable EQ (using the proper format, e.g., 'X(t)+iY(t)' for PARAMETRIC). 3 - Enter name (and range, if necessary) of independent and dependent variables 4 - Enter axes specifications as a list { center atick x-label y-label } 5 - Use ERASE, DRAX, LABEL, DRAW to produce a fully labeled graph with axes This same approach can be used to produce plots with a program, except that in a program you need to add the command PICTURE after the DRAW function is called to recall the graphics screen to the stack. Examples of program-generated plots In this section we show how to implement with programs the generation of the last three examples. Activate the PLOT menu before you start typing the program to facilitate entering graphing commands („ÌC, see above). Example 1 - A function plot. Enter the following program: Page 22-17