HP 48gII hp 48gII_user's manual_English_E_HDPMSG48E67_V2.pdf - Page 749

An example of a program using GROB The following program produces the graph of the sine function including a frame - drawn with the function BOX - and a GROB to label the graph. Here is the listing of the program: « RAD 131 R B 64 R B PDIM -6.28 6.28 XRNG -2. 2. YRNG FUNCTION 'SIN(X)' STEQ ERASE DRAX LABEL DRAW (-6.28,-2.) (6.28,2.) BOX PICT RCL "SINE FUNCTION" 1 GROB (-6., 1.5) SWAP GOR PICT STO { } PVIEW » Begin program Set angle units to radians Set PICT screen to 131×64 pixels Set x- and y-ranges Select FUNCTION type for graphs Store the function sine into EQ Clear, draw axes, labels, graph Draw a frame around the graph Place contents of PICT on stack Place graph label string in stack Convert string into a small GROB Coordinates to place label GROB Combine PICT with the label GROB Save combined GROB into PICT Bring PICT to the stack End program Save the program under the name GRPR (GROB PRogram). Press @GRPR to run the program. The output will look like this: A program with plotting and drawing functions In this section we develop a program to produce, draw and label Mohr's circle for a given condition of two-dimensional stress. The left-hand side figure below shows the given state of stress in two-dimensions, with σxx and σyy being normal stresses, and τxy = τyx being shear stresses. The right-hand Page 22-33