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Extending aplets 22-5 hp40g+.book Page 6 Friday, December 9, 2005 1:03 AM If you are using the PC Connectivity Kit to download aplets from a PC, you will see a list of aplets in the PC’s current directory. Check as many items as you would like to receive. Sorting items in the aplet library menu list Once you have entered information into an aplet, you have defined a new version of an aplet. The information is automatically saved under the current aplet name, such as “Function.” To create additional aplets of the same type, you must give the current aplet a new name. The advantage of storing an aplet is to allow you to keep a copy of a working environment for later use. The aplet library is where you go to manage your aplets. Press . Highlight (using the arrow keys) the name of the aplet you want to act on. To sort the In the aplet library, press . Select the sorting scheme . aplet list and press • Chronologically produces a chronological order based on the date an aplet was last used. (The last- used aplet appears first, and so on.) • Alphabetically produces an alphabetical order by aplet name. To delete an You cannot delete a built-in aplet. You can only clear its aplet data and reset its default settings. To delete a customized aplet, open the aplet library, highlight the aplet to be deleted, and press . To delete all custom aplets, press CLEAR. 22-6 Extending aplets hp40g+.book Page 1 Friday, December 9, 2005 1:03 AM Reference information Glossary aplet A small application, limited to one topic. The built-in aplet types are Function, Parametric, Polar, Sequence, Solve, Statistics, Inference, Finance, Trig Explorer, Quad Explorer, Linear Explorer and Triangle Solve. An aplet can be filled with the data and solutions for a specific problem. It is reusable (like a program, but easier to use) and it records all your settings and definitions. command expression function HOME An operation for use in programs. Commands can store results in variables, but do not display results. Arguments are separated by semicolons, such as DISP expression;line#. A number, variable, or algebraic expression (numbers plus functions) that produces a value. An operation, possibly with arguments, that returns a result. It does not store results in variables. The arguments must be enclosed in parentheses and separated with commas (or periods in Comma mode), such as CROSS(matrix1,matrix2). The basic starting point of the calculator. Go to HOME to do calculations. Library For aplet management: to start, save, reset, send and receive aplets. R-1 hp40g+.book Page 2 Friday, December 9, 2005 1:03 AM list A set of values separated by commas (periods if the Decimal Mark mode is set to Comma) and enclosed in braces. Lists are commonly used to enter statistical data and to evaluate a function with multiple values. Created and manipulated by the List editor and catalog. matrix A two-dimensional array of values separated by commas (periods if the Decimal Mark mode is set to Comma) and enclosed in nested brackets. Created and manipulated by the Matrix catalog and editor. Vectors are also handled by the Matrix catalog and editor. menu A choice of options given in the display. It can appear as a list or as a set of menu-key labels across the bottom of the display. menu keys The top row of keys. Their operations depend on the current context. The labels along the bottom of the display show the current meanings. note Text that you write in the Notepad or in the Note view for a specific aplet. program A reusable set of instructions that you record using the Program editor. sketch A drawing that you make in the Sketch view for a specific aplet. variable The name of a number, list, matrix, note, or graphic that is stored in memory. Use to store and use to retrieve. vector A one-dimensional array of values separated by commas (periods if the Decimal Mark mode is set to Comma) and enclosed in single brackets. Created and manipulated by the Matrix catalog and editor. R-2 ReferenceInfo.fm Page 3 Friday, December 16, 2005 11:26 AM views The possible contexts for an aplet: Plot, Plot Setup, Numeric, Numeric Setup, Symbolic, Symbolic Setup, Sketch, Note, and special views like split screens. Resetting the HP 40gs If the calculator “locks up” and seems to be stuck, you must reset it. This is much like resetting a PC. It cancels certain operations, restores certain conditions, and clears temporary memory locations. However, it does not clear stored data (variables, aplet databases, programs) unless you use the procedure, “To erase all memory and reset defaults”. To reset using Press and hold the key and the third menu key the keyboard simultaneously, then release them. If the calculator does not respond to the above key sequence, then: 1. Turn the calculator over and locate the small hole in the back of the calculator. 2. Insert the end of a straightened metal paper clip into the hole as far as it will go. Hold it there for 1 second, then remove it. 3. Press If ...