HP 48gII hp 48gII_user's manual_English_E_HDPMSG48E67_V2.pdf - Page 61

An algebraic object, or simply, an algebraic (object of type 9), is a valid algebraic expression enclosed between apostrophes. Binary integers, objects of type 10, are used in some computer science applications. Graphics objects, objects of type 11, store graphics produced by the calculator. Tagged objects, objects of type 12, are used in the output of many programs to identify results. For example, in the tagged object: Mean: 23.2, the word Mean: is the tag used to identify the number 23.2 as the mean of a sample, for example. Unit objects, objects of type 13, are numerical values with a physical unit attached to them. Directories, objects of type 15, are memory locations used to organize your variables in a similar fashion as folders are used in a personal computer. Libraries, objects of type 16, are programs residing in memory ports that are accessible within any directory (or sub-directory) in your calculator. They resemble built-in functions, objects of type 18, and built-in commands, objects of type 19, in the way they are used. Editing expressions in the screen In this section we present examples of expression editing directly into the calculator display (algebraic history or RPN stack). Creating arithmetic expressions For this example, we select the Algebraic operating mode and select a Fix format with 3 decimals for the display. We are going to enter the arithmetic expression: 1.0 + 1.0 5.0 ⋅ 7.5 3.0 − 2.03 To enter this expression use the following keystrokes: Page 2-3