Texas Instruments TI-86 Manual Book page 300

288
Chapter 20: A to Z Function and Instruction Reference
DS<(
‡ program editor
CTL menu
dxDer1
† mode screen
dxNDer
† mode screen
e^
- ‚
: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.
dxDer1
Sets der1 as the current differentiation type.
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.
dxNDer
Sets as the current differentiation type.
nDer
differentiates numerically and calculates the value for
an expression. It is less accurate than
restrictive in the functions that are valid in the
expression.
e^ power or e^( expression
Returns e raised to power or expression. The argument
can be real or complex.
der1
nDer
dxDer1 , but less
)
Program segment:
©
:9¶A
:Lbl Start
:Disp A
:DS<(A,5)
:Goto Start
:Disp "A is now <5"
©
The current differentiation type is used by the
arc( and TanLn( functions, as well as
interactive graphing operations
dy/dt , dx/dt , ARC , TanLn , and INFLC
The current differentiation type is used by the
and functions, as well as
arc( TanLn(
interactive graphing operations
, , , , and
dy/dt dx/dt ARC TanLn INFLC
e^0 b
dy/dx , dr/dq ,
.
, ,
dy/dx dr/dq
.
1