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Texas Instruments TI-89 Tip List

Texas Instruments TI-89
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differences are expanded. Best used in Radian
mode, because degree-mode scaling interferes
with expansion. tExpand() tends to reverse
tCollect(). Applying tCollect() to a tExpand()
result, or vice versa, in two steps may simplify
an expression.
Text string
Display string in a dialog box. If used outside of
a Dialog...EndDlog block, a dialog box is
created, otherwise string is shown in the defined
dialog box.
Then
See If.
Title string[,label]
Create the title of a menu or dialog box when
used in a ToolBar or Custom structure, or a
Dialog ... EndDlog block. label is only valid in the
ToolBar structure. When used, it allows the
menu choice to branch to label.
tmpCnv(expr_°unit1,_°unit2)
Return temperature value expr converted from
unit1 to unit2. Valid units are _°C, _°F, _°K and
_°R. To convert a temperature range instead of
a value, use tmpCnv().
tmpCnv(expr_°unit1,_°unit2)
Return temperature range expr converted from
unit1 to unit2. Valid units are _°C, _°F, _°K and
_°R. To convert a temperature value instead of
a range, use tmpCnv().
Toolbar
ToolBar : block : EndTBar
Create a toolbar menu. block statements can be
either Title or Item. Item statements must have
labels. Title statements must have labels if there
are no Item statements.
Trace
Draw a SmartGraph and place the trace cursor
on the first Y= function, at the previous cursor
position, or at the reset position if regraphing
was necessary. Allows operation of the cursor
keys and most coordinate editing keys. Press
[ENTER] to resume operation.
Try
Try : block1 : Else : block2 : EndTry
Execute block1 until an error occurs, then
transfer execution to block2. errornum contains
the error number. See also ClrErr and PassErr.
TwoVar xList,yList[[,freqList][,catList][,incList]]
Calculate two-variable statistics and update
system statistics variables. All lists must have
equal dimension except incList. The first four
arguments must be variable names of c1 - c99.
incList need not be a variable name and cannot
be c1 - c99.
Unarchiv var1[,var2][,var3]...
Move argument variables from user data
archive memory (flash) to RAM. Archived
variables can be accessed, but not deleted,
renamed or stored to, since the variable is
locked. Use Archive to archive variables.
unitV(vector)
Return row- or column-unit vector, depending on
the form of vector, which must be a single-row
or single-column matrix.
Unlock var1[,var2][,var3]...
Unlock the argument variables. Use Lock to lock
variables.
variance(list[,freqList])
Return the population variance of the elements
of list. freqList elements specify the frequency of
the corresponding elements of list. Both lists
must have at least two elements, and the same
number of elements.
(matrix[,freqMatrix])
Return row vector of the population variance of
the column elements of matrix. freqMatrix
elements specify the frequency of
corresponding matrix elements. matrix must
have at least two rows.
when()
(condition,trueRes[,falseRes][,unknownRes])
Return trueRes, falseRes, or unknownRes,
when condition is true, false or unknown.
Returns the arguments when there too few
arguments to determine the result. Omit both
falseRes and unknownRes to define an
expression only when condition is true. undef
can be used as a result.
While
While condition : block : EndWhile
15 - 25

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Texas Instruments TI-89 Specifications

General IconGeneral
Display size (HxV)100 x 160 mm
Memory type639K FLASH ROM, 188K bytes RAM
Compatible operating systemsOperating System 2.09
Battery typeAAA

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