HP 48gII hp 48gII_user's manual_English_E_HDPMSG48E67_V2.pdf - Page 93

subdirectories, in a hierarchy of directories similar to folders in modern computers. The subdirectories will be given names that may reflect the contents of each subdirectory, or any arbitrary name that you can think of. The CASDIR sub-directory The CASDIR sub-directory contains a number of variables needed by the proper operation of the CAS (Computer Algebraic System, see appendix C). To see the contents of the directory, we can use the keystroke combination: „¡which opens the File Manager once more: This time the CASDIR is highlighted in the screen. To see the contents of the directory press the @@OK@@ (F) soft menu key or `, to get the following screen: The screen shows a table describing the variables contained in the CASDIR directory. These are variables pre-defined in the calculator memory that establish certain parameters for CAS operation (see appendix C). The table above contains 4 columns: • The first column indicate the type of variable (e.g., 'EQ' means an equation-type variable, |R indicates a real-value variable, { } means a list, nam means 'a global name', and the symbol represents a graphic variable. • The second column represents the name of the variables, i.e., PRIMIT, CASINFO, MODULO, REALASSUME, PERIOD, VX, and EPS. • Column number 3 shows another specification for the variable type, e.g., ALG means an algebraic expression, GROB stands for graphics object, INTG means an integer numeric variable, LIST means a list of data, Page 2-35