HP 40gs hp 40gs_user's guide_English_E_HDPMSG40E07A.pdf - Page 265
How to enter infix, functions, How to enter prefix
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hp40g+.book Page 13 Friday, December 9, 2005 1:03 AM select the entire expression and press obtain: 4-5 However, if you type: ∞ ∑ K K-1-----+-----1---)- K=1 , you How to enter infix functions select the entire expression and press obtain 1. , you An infix function is one that is typed between its arguments. For example, AND, |and MOD are infix functions.You can either: • type them in Alpha mode and then enter their arguments, or • select them from a CAS menu or by pressing an appropriate key, provided that you have already written and selected the first argument. You move from one argument to the other by pressing and . The comma enables you to write a complex number: when you type (1,2), the parentheses are automatically placed when you type the comma. If you want to type (-1,2), you must select -1 before you type the comma. How to enter prefix functions Equation Writer A prefix function is one that is typed before its arguments. To enter a prefix function, you can: • type the first argument, select it, then select the function from a menu, or • you can select the function from a menu, or by directly entering it in Alpha mode, and then type the arguments. The following example illustrates the various ways of entering a prefix function. Suppose you want to factor the expression x2 - 4, then find its value for x = 4. FACTOR is the function for factoring, and it is found on the menu. SUBST is the function for substituting a value for a variable in an expression, and it is also found in the menu. l 15-13