HP 40gs HP 39gs_40gs_Mastering The Graphing Calculator_English_E_F2224-90010.p - Page 189

The 'Constant' group of functions These 'functions' consist of a set of commonly occurring constants. Two of them, MAXREAL and MINREAL are mainly of use to programmers except for an important influence on the evaluation of limits (see page 80). They consist, respectively, of the largest and smallest numbers with which the calculator is capable of dealing, and are there for use by programmers as a check to ensure that calculations within a program have not overflowed the capacity of the calculator. The other three, π, i, and e, are far more easily obtained via the keyboard. The first, π, is available via a key on the face of the calculator above the 3 key. The other two , i & e, are easily obtained as lowercase letters via the ALPHA key, pressing SHIFT first to get lowercase. The 'Convert' group of functions This is a set of functions which allow conversion of metric units to imperial and vice versa. The list is not very extensive but does cover the more common ones. The syntax is the same for all. For example, the ÆC function converts to Celsius from the equivalent Fahrenheit. To convert 212 degrees Fahrenheit to Celsius just type ÆC(212). To convert 100 kg to pounds, use ÆLBS(100) as shown in the screen shot. The available functions are: ÆC - converts Fahrenheit to Celsius ÆCM - converts inches to centimeters ÆL - converts litres to US gallons ÆKG - converts pounds to kilograms ÆKM - converts miles to kilometers ÆDEG - converts radians into degrees ÆF - converts Celsius to Fahrenheit ÆIN - converts centimeters to inches ÆGAL - converts US gallons to litres ÆLBS - converts kilograms to pounds ÆMILE - converts kilometers to miles ÆRAD - converts degrees into radians 189