Function signtab, Function tabvar, Function signtab ,13-10 function tabvar ,13-10 – HP 50g Graphing Calculator User Manual

Page 445

Advertising
background image

Page 13-10

This result indicates that the range of the function

corresponding to the domain D = { -1,5 } is R =

.

Function SIGNTAB

Function SIGNTAB, available through the command catalog (‚N),
provides information on the sign of a function through its domain. For example,
for the TAN(X) function,

SIGNTAB indicates that TAN(X) is negative between –

π/2 and 0, and positive

between 0 and

π /2. For this case, SIGNTAB does not provide information (?)

in the intervals between –

∞ and -π /2, nor between +π /2 and ∞. Thus,

SIGNTAB, for this case, provides information only on the main domain of
TAN(X), namely -

π /2 < X < +π /2.

A second example of function SIGNTAB is shown below:

For this case, the function is negative for X<-1 and positive for X> -1.

Function TABVAR

This function is accessed through the command catalog or through the GRAPH
sub-menu in the CALC menu. It uses as input the function f(VX), where VX is the
default CAS variable. The function returns the following, in RPN mode:

1

1

)

(

2

+

=

X

X

f

26

26

,

2

2

Advertising