Calculator User Manual
Appendix A: Functions and Instructions 449
8992APPA.DOC TI-89 / TI-92 Plus: Appendix A (US English) Susan Gullord Revised: 02/23/01 1:48 PM Printed: 02/23/01 2:21 PM Page 449 of 132
Use the “|” operator to restrict the solution
interval and/or specify the sign of other
undefined variables.
For the
APPROX
setting of the
Exact/Approx
mode,
fMax()
iteratively searches for one
approximate local maximum. This is often
faster, particularly if you use the “|” operator
to constrain the search to a relatively small
interval that contains exactly one local
maximum.
Note: See also
fMin()
and
max()
.
fMax(.5x^3
ì
x
ì
2,x)|x1
¸
x
=
ë
.816
...
fMax(a
ù
x^2,x)
¸
x
=
ˆ or x
=
ë
ˆ or x
=
0 or a
=
0
fMax(a
ù
x^2,x)|a<0
¸
x
=
0
fMin()
MATH/Calculus menu
fMin(expression, var)
⇒
Boolean expression
Returns a Boolean expression specifying
candidate values of
var
that minimize
expression
or locate its greatest lower bound.
Use the “|” operator to restrict the solution
interval and/or specify the sign of other
undefined variables.
For the
APPROX
setting of the
Exact/Approx
mode,
fMin()
iteratively searches for one
approximate local minimum. This is often
faster, particularly if you use the “|” operator
to constrain the search to a relatively small
interval that contains exactly one local
minimum.
Note: See also
fMax()
and
min()
.
fMin(1
ì
(x
ì
a)^2
ì
(x
ì
b)^2,x)
¸
x
=
ˆ or x
=
ë
ˆ
fMin(.5x^3
ì
x
ì
2,x)|x‚1
¸
x
=
1
fMin(a
ù
x^2,x)
¸
x
=
ˆ or x
=
ë
ˆ or x
=
0 or a
=
0
fMin(a
ù
x^2,x)|a>0 and x>1
¸
x
=
1
.
fMin(a
ù
x^2,x)|a>0
¸
x
=
0
FnOff
CATALOG
FnOff
Deselects all Y= functions for the current
graphing mode.
In split-screen, two-graph mode,
FnOff
only
applies to the active graph.
FnOff [1] [, 2] ... [,99]
Deselects the specified Y= functions for the
current graphing mode.
In function graphing mode:
FnOff 1,3
¸
deselects
y1(x)
and
y3(x)
.
In parametric graphing mode:
FnOff 1,3
¸
deselects
xt1(t)
,
yt1(t)
,
xt3(t)
, and
yt3(t)
.
FnOn
CATALOG
FnOn
Selects all Y= functions that are defined for
the current graphing mode.
In split-screen, two-graph mode,
FnOn
only
applies to the active graph.