Calculator User Manual

Chapter 20: A to Z Function and Instruction Reference
309
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 309 of 11820ATOZ.DOC TI-86, Chap 20, US English Bob Fedorisko Revised: 02/13/01 2:42 PM Printed: 02/13/01 3:05 PM Page 309 of 118
inter(
† MATH menu
inter(
x1
,
y1
,
x2,y2
,
xValue
)
Calculates the line through points (
x1
,
y1
) and (
x2
,
y2
)
and then interpolates or extrapolates a
y
value for the
specified
xValue
.
Using points (3,5) and (4,4), find the y value at
x=1:
inter(3,5,4,4,1)
b
7
inter(
y1
,
x1
,
y2,x2
,
yValue
)
Interpolates or extrapolates an
x
value for the specified
yValue
. Notice that points (
x1
,
y1
) and (
x2
,
y2
) must be
entered as (
y1
,
x1
) and (
y2
,
x2
).
Using points (
L
4,
L
7) and (2,6), find the x value
at y=10:
inter(
L
7,
L
4,6,2,10)
b
3.84615384615
Inverse:
L
1
-
ƒ
number
L
1
or
(
expression
)
L
1
Returns 1 divided by a real or complex
number
, where
number
ƒ
0.
5
L
1
b
.2
(10
¹
6)
L
1
b
.016666666667
list
L
1
Returns a list in which each element is 1 divided by the
corresponding element in
list
.
{
L
.5,10,2/8}
L
1
b
{
L
2 .1 4}
squareMatrix
L
1
Returns an inverted
squareMatrix
, where det
ƒ
0.
[[1,2][3,4]]
L
1
b
[[
L
2 1 ]
[1.5
L
.5]]
iPart
MATH NUM menu
iPart
number
or
iPart (
expression
)
Returns the integer part of
number
or
expression
. The
argument can be real or complex.
iPart 23.45
b
23
iPart
L
23.45
b
L
23