Texas Instruments PLUS TI-89 - Manual (Page 466)

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^3ì xì 2,x)|x 1 ¸
x = ë.816...
fMax(aù x^2,x) ¸
x = ˆ or x = ë ˆ or x = 0 or a = 0
fMax(aù 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(1ì (xì a)^2ì (xì b)^2,x) ¸
x = ˆ or x = ë ˆ
fMin(.5x^3ì xì 2,x)|x ‚1 ¸ x = 1
fMin(aù x^2,x) ¸
x = ˆ or x = ë ˆ or x = 0 or a = 0
fMin(aù x^2,x)|a>0 and x>1 ¸
x = 1.
fMin(aù 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.