HP 40gs hp 40gs_user's guide_English_E_HDPMSG40E07A.pdf - Page 31

hp40g+.book Page 19 Friday, December 9, 2005 1:03 AM To change views To save aplet configuration Each view is a separate environment. To change a view, select a different view by pressing , , keys or select a view from the VIEWS menu. To change to HOME, press . You do not explicitly close the current view, you just enter another one-like passing from one room into another in a house. Data that you enter is automatically saved as you enter it. You can save an aplet configuration that you have used, and transfer the aplet to other HP 40gs calculators. See "Creating new aplets based on existing aplets" on page 22-1. Mathematical calculations The most commonly used math operations are available from the keyboard. Access to other math functions is via the MATH menu ( ). You can also CAS for symbolic calculations. See "Computer Algebra System (CAS)" on page 14-1 for further information. To access programming commands, press CMDS. See "Programming commands" on page 21-13 for further information. Where to start The home base for the calculator is the HOME view ( ). You can do all non-symbolic calculations here, and you can access all operations. (Symbolic calculations are done using CAS.) Entering expressions • In the HOME view, you enter an expression in the same left-to-right order that you would write the expression. This is called algebraic entry. (In CAS you enter expressions using the Equation Writer, explained in detail in Chapter 15, "Equation Writer".) • To enter functions, select the key or MATH menu item for that function. You can also enter a function by using the Alpha keys to spell out its name. • Press to evaluate the expression you have in the edit line (where the blinking cursor is). An expression can contain numbers, functions, and variables. Getting started 1-19