Calculator User Manual

288
Chapter 20: A to Z Function and Instruction Reference
20ATOZ.DOC TI-86, Chap 20, US English Bob Fedorisko Revised: 02/13/01 2:42 PM Printed: 02/13/01 3:05 PM Page 288 of 118
DS<(
‡ program editor
CTL menu
:DS<(
variable
,
value
)
:
command-if-variable ‚ value
:
commands
Decrements
variable
by 1. If the result is <
value
, skips
command-if-variable
‚ value
.
If the result is
‚ value
, then
command-if-variable‚value
is executed.
variable
cannot be a built-in variable.
Program segment:
©
:9
¶
A
:Lbl Start
:Disp A
:DS<(A,5)
:Goto Start
:Disp "A is now <5"
©
dxDer1
† mode screen
dxDer1
Sets
der1
as the current differentiation type.
der1
differentiates exactly and calculates the value for each
function in an expression. It is more accurate than
dxNDer
, but more restrictive in that only certain
functions are valid in the expression.
The current differentiation type is used by the
arc(
and
TanLn(
functions, as well as
interactive graphing operations
dy/dx
,
dr/d
q
,
dy/dt
,
dx/dt
,
ARC
,
TanLn
, and
INFLC
.
dxNDer
† mode screen
dxNDer
Sets
nDer
as the current differentiation type.
nDer
differentiates numerically and calculates the value for
an expression. It is less accurate than
dxDer1
, but less
restrictive in the functions that are valid in the
expression.
The current differentiation type is used by the
arc(
and
TanLn(
functions, as well as
interactive graphing operations
dy/dx
,
dr/d
q
,
dy/dt
,
dx/dt
,
ARC
,
TanLn
, and
INFLC
.
e^
- ‚
e^
power
or
e^(
expression
)
Returns
e
raised to
power
or
expression
. The argument
can be real or complex.
e^0
b
1