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248 Chapter 15: Data/Matrix Editor
15DATAMA.DOC TI-89/TI-92 Plus: Data/Matrix Editor (English) Susan Gullord Revised: 02/23/01 1:10 PM Printed: 02/23/01 2:17 PM Page 248 of 16
In the Data/Matrix Editor:
1. Move the cursor to any cell in the column and press
†
.
— or —
Move the cursor to the header cell (
c1
,
c2
, etc.) and press
¸
.
Note:
¸
is not required if you want to type a new definition
or replace the existing one. However, if you want to edit the
existing definition, you must press
¸
.
2. Type the new expression, which replaces any existing definition.
If you used
†
or
¸
in Step 1, the cursor moved to the entry
line and highlighted the existing definition, if any. You can also:
¦
Press
M
to clear the highlighted expression. Then type the
new expression.
— or —
¦ Press
A
or
B
to remove the highlighting. Then edit the old
expression.
You can use an expression that: For example:
Generates a series of numbers.
c1=seq(x^2,x,1,5)
c1={1,2,3,4,5}
Refers to another column.
c2=2
ù
c1
c4=c1
ù
c2
ì
sin(c3)
3. Press
¸
,
D
, or
C
to
save the definition and
update the columns.
1. Move the cursor to any cell in the column and press
†
.
—or—
Move the cursor to the header cell (
c1
,
c2
, etc.) and press
¸
.
2. Press
M
to clear the highlighted expression.
3. Press
¸
,
D
, or
C
.
Defining a Column Header with an Expression
For a list variable or a column in a data variable, you can enter
a function in the column header that automatically generates a
list of elements. In a data variable, you can also define one
column in terms of another.
Entering a Header
Definition
Tip: To view an existing
definition, press
†
or move
the cursor to the header cell
and look at the entry line.
Tip: To cancel any changes,
press
N
before pressing
¸
.
Note: The
seq
function is
described in Appendix A.
Note: If you refer to an
empty column, you will get
an error message (unless
Auto-calculate = OFF as
described on page 249).
Note: For a data variable,
header definitions are saved
when you leave the Data/
Matrix Editor. For a list
variable, the definitions are
not saved (only their
resulting cell values).
Clearing a Header
Definition
You cannot directly
change a locked cell
(
Œ
) since it is defined
by the column header.
c1=seq(x,x,1,7)
c2=2
ù
c1