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=2ùc1
c4=c1ùc2ìsin(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=2ùc1