How equation writer sees expressions – HP 49g Graphing Calculator User Manual
Page 65
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Understanding how Equation Writer sees expressions will help you work
with expressions.
The expression that you are editing is represented within Equation Writer
as a tree structure, with the operators as branching points, and operands
as branches. You use the arrow keys to navigate around the tree and select
groups of branches.
For example, consider the expression:
(5x + 3)(x-^l)
(.r + 5)
The tree structure for this expression appears as follows to Equation
Writer:
How Equation Writer sees expressions
In Selection mode, when the cursor is positioned on 5 in the
(5x
+ 3)
component:
® If you press ® once, the selection point moves to the ® operator and
Equation Writer selects the
5x
expression.
* If you press ® again, the selection point moves to the © operator, and
Equation Writer selects the (5.r + 3) expression.
® If you press ® again, the selection point moves to the ® operator, and
Equation Writer selects the entire numerator.
® If you press ® again, the selection point moves to the top of the tree
structure, and Equation Writer selects the entire expression.
You can press ® or @ to move laterally within the equation tree to select
terms and expressions at the same level.
Creating and editing expressions
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