Texas Instruments TI-89 Tip List page 477

dim(list)
Return dimension of list.
(matrix)
Return list of dimensions of matrix as
{rows,columns}
(string)
Return dimension (number of characters) of
string.
Disp [expOrString1], [expOrString2], ...
Display the program I/O screen. If any
arguments (expressions or strings) are used,
they are displayed on separate screen lines.
Arguments are displayed in Pretty Print if Pretty
Print mode is On.
DispG
Display the Graph Screen.
DispHome
Display the Home screen.
DispTbl
Display the Table screen. Use the cursor pad to
scroll. Press [ENTER] or [ESC] to resume
program operation.
▶ ▶ ▶ ▶ DMS
expr ▶DMS, list ▶DMS, matrix ▶DMS
Display the argument as an angle in format
DDDDDD°MM'SS.ss". ▶DMS converts from
radians in radian mode.
dotP()
(list1,list2), (vector1,vector2)
Return the dot product of two lists or vectors.
Vectors must both be row or column vectors.
DrawFunc expr
Draw expr as a function of x on the Graph
screen.
DrawInv expr
Draw the inverse of expr on the Graph screen
by plotting x values on the y axis and vice versa.
DrawParm expr1, expr2 [,tmin] [,tmax] [,tstep]
Draw parametric expressions expr1 and expr2
with t as the independent variable, from tmin to
tmax with tstep between each evaluated t value.
The current Window variables are the defaults
for tmin, tmax and tstep. Using the t-arguments
does not change the Window settings. The
t-arguments must be used if the current Graph
mode is not Parametric.
DrawPol expr, [,θmin] [,θmax] [,θstep]
Draw expr as a polar graph with independent
variable θ. Defaults for θmin, θmax and ,θstep
are the current Window settings. Specifying
θ-arguments does not change the Window
settings. Theθ-arguments must be used if the
Graph mode is not Polar.
DrawSlp x1, y1, slope
Display the Graph screen and draw the line y =
slope*(x-x1) + y1.
DropDown title, {item1, item2, ...},var
Display a drop-down menu with the name title in
a Dialog box. The drop-down menu choices are
1:item2, 2:item2 and so on. The number of the
selected item is stored in var. If var exists and
its value is in the range of items, the referenced
item is the default menu selection.
DrwCtour
expr
list
Draw contours on the current 3D graph, in
addition to the contours specfied by the
ncontour system variable. expr or list specifies
the z-values at which the contours are drawn.
3D graph mode must be set. DrwCtour sets the
graph style to CONTOUR LEVELS.
    (enter exponent)
mantissaexponent
Enter a number in scientific notation as
exponent
mantissa * 10 . To avoid a decimal value
integer
result, use 10 , instead.
e^()
(expr)
Raise e to the expr power. e is the natural
logarithm base 2.718..., not the character 'e'. In
Radian angle mode, you may enter complex
numbers in the polar format re
(list)
Return list of e raised to each element in list.
(matrix)
Return the matrix exponential of square matrix,
which is not the same as e raised to the power
of each element. See cos() for calculation
iθ
.
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