HP 50G, User Manual

Page: 87 / 887

Page 2-27
Detailed explanation on the use of the help facility for the CAS is presented in
Chapter 1. To return to the Equation Writer, press the
@EXIT
soft menu key. Press
the
`
key to exit the Equation Writer.
Using the editing functions BEGIN, END, COPY, CUT and PASTE
To facilitate editing, whether with the Equation Writer or on the stack, the
calculator provides five editing functions, BEGIN, END, COPY, CUT and PASTE,
activated by combining the right-shift key (
‚
) with keys (2,1), (2,2), (3,1),
(3,2), and (3,3), respectively. These keys are located in the leftmost part of
rows 2 and 3. The action of these editing functions are as follows:
BEGIN: marks the beginning of a string of characters for editing
END:
marks the ending of a string of characters for editing
COPY: copies the string of characters selected by BEGIN and END
CUT:
cuts the string of characters selected by BEGIN and END
PASTE: pastes a string of characters, previously copied or cut, into the current
cursor position
To see and example, lets start the Equation Writer and enter the following
expression (used in an earlier exercise):
2 / R3 ™™ * ~‚m + „¸\ ~‚m
™™ * ‚¹ ~„x + 2 * ~‚m * ~‚c
~„y ——— / ~‚t Q1/3
The original expression is the following:
We want to remove the sub-expression x+2
⋅λ⋅Δ
y from the argument of the LN
function, and move it to the right of the
λ
in the first term. Here is one
possibility:
˜ššš———‚ªšš—*‚¬
The modified expression looks as follows: