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
+
81
*
^
X
A
B
E
C
D
2
3
G
Q
P
5
R
^
2
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
F
can sometimes be frustratingly difficult.
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