HP 40gs HP 39gs_40gs_Mastering The Graphing Calculator_English_E_F2224-90010.p - Page 336
Changing Font, Erasing, copying, cutting and pasting, it to the tree. Try it and see.
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Changing Font Although the default font is very easy to read, it is quite large and often makes parts of the expression or result extend off the screen. Changing to a small font can help with this, at the cost of making the characters a little more difficult to read. The Change Font command is found on the menu. It is a toggle command - it changes to small font if in large mode and vice versa. Contrasting screens are shown to the right: Erasing, copying, cutting and pasting When you press the DEL button in the CAS editor the effect is basically to remove nodes of the tree. The first node deleted is the one furthest right in the currently highlighted section. For example, if the highlight was as shown in the screen above, then the current focus would be on node B in the tree shown right. Successively pressing DEL would begin at node E, deleting first the node's contents then the operation (multiply) which connected it to the tree. Try it and see. This process is best seen with experimentation. My experience has been that if you are simply wishing to edit a small portion of the expression then the best method may be to use the 'Edit Expr.' command in the menu. The tree structure used by the editor means that although it is usually very easy to add new operations and expressions within an existing one, it can sometimes be frustratingly difficult. R A + 5 S P C ^ 81 B * 2 Q D E ^ X F G 2 3 336