HP 39GS HP 39gs_40gs_Mastering The Graphing Calculator_English_E_F2224-90010.p - Page 53
The Menu Bar functions, Trace, Defn
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The Menu Bar functions In the examples and explanations which follow, the functions and settings used are: Trace is quite a useful tool. The dot next to the word means that it is currently switched on. If yours shows instead then press the key underneath to turn it on. Leave it on for now. Press the left arrow 5 or 6 times to see a similar display to that shown right. Pressing up or down arrow moves from function to function. The order used when moving from graph to graph is not related to the physical location of the graphs on the screen but rather to the order that they are defined in the SYMB view. If is turned off then the cursor is free to move anywhere on the screen. Defn Press the key labeled (short for Definition). You will find that the equation is now listed at the bottom of the screen. The up/down arrows will move the cursor from F1(X) to F2(X), with the definition changing as it does so. If is switched off then will not work correctly, nor will various other useful tools. However, it does have the advantage that the cursor can be freely moved around the screen with the current coordinates displayed at the bottom of the screen. For this aspect to work properly you really need to choose a scale where the pixels are on 'nice' numbers. Multiples or fractions of the default scale are best for this. 53
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