Texas Instruments TI-86 - Manual (Page 321)

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 118 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 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 ( L4,L7) 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 L1 b .2
(10¹6) L1 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} L1 b { L2 .1 4}
squareMatrix L 1
Returns an inverted squareMatrix, where det ƒ 0.
[[1,2][3,4]] L1 b [[ L2 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