Texas Instruments PLUS TI-89 - Manual (Page 265)

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=2ù c1
c4=c1ù c2ì 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
(
Π) since it is defined
by the column header.
c1=seq(x,x,1,7)
c2=2 ù c1