HP 48gII hp 48gII_user's manual_English_E_HDPMSG48E67_V2.pdf - Page 650

Chapter 21 Programming in User RPL language User RPL language is the programming language most commonly used to program the calculator. The program components can be put together in the line editor by including them between program containers « » in the appropriate order. Because there is more experience among calculator users in programming in the RPN mode, most of the examples in this Chapter will be presented in the RPN mode. Also, to facilitate entering programming commands, we suggest you set system flag 117 to SOFT menus. The programs work equally well in ALG mode once they have been debugged and tested in RPN mode. If you prefer to work in the ALG mode, simply learn how to do the programming in RPN and then reset the operating mode to ALG to run the programs. For a simple example of User RPL programming in ALG mode, refer to the last page in this chapter. An example of programming Throughout the previous Chapters in this guide we have presented a number of programs that can be used for a variety of applications (e.g., programs CRMC and CRMT, used to create a matrix out of a number of lists, were presented in Chapter 10). In this section we present a simple program to introduce concepts related to programming the calculator. The program we will write will be used to define the function f(x) = sinh(x)/(1+x2), which accepts lists as argument (i.e., x can be a list of numbers, as described in Chapter 8). In Chapter 8 we indicated that the plus sign, , acts as a concatenation operator for lists and not to produce a term-by-term sum. Instead, you need to use the ADD operator to achieve a term-by-term summation of lists. Thus, to define the function shown above we will use the following program: «'x' STO x SINH 1 x SQ ADD / 'x' PURGE » To key in the program follow these instructions: Keystroke sequence x™K ~„x Produces: « 'x' STO x Interpreted as: Start an RPL program Store level 1 into variable x Place x in level 1 Page 21-1