HP 49g Graphing Calculator - Manual (Page 62)

Using Equation Writer
As you create or edit an expression, keep the following points in mind:
® You use the operators and the fimctions from the keyboard to specify
the operations that your expression contains. For example, to include
an arithmetic addition, press ©. To include a sine function, press (SIN).
® By default, any operation you select is applied to the fimction or tenn
immediately to the left of the cursor. You press ® to extend the
selection on the left to which the next operation will apply.
Implied multiplication
You normally press ® to specify multiplication. However, for certain
expressions. Equation Writer assumes that multiplication is intended and
you do not need to specify it. This is the case in the following situations:
» a number followed by a letter, for example
2x
• a number or letter followed by an opening parenthesis
• a number or letter followed by a prefix function, that is a function
where the arguments appear after the name, for example sin(.r).
• a right parenthesis followed by a left parenthesis.
Entering e and /
To enter the value
e,
the base for natural logarithms, or
i,
the square root
of-1, you can simply use the alpha keys to enter lower-case
e
or
i.
That is:
• to enter
e,
press (SM)Rle
® to enter
i,
press (S|HA)0i.
In algebraic expressions, the HP 49G recognizes these letters as the
equivalent values.
You can also enter
i
by pressing 0®.
Page 3-4 Creating and editing expressions