Function Tabvar - HP 50g User Manual

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 – /2 and 0, and positive
between 0 and
in the intervals between – and - /2, nor between + /2 and . Thus,
SIGNTAB, for this case, provides information only on the main domain of
TAN(X), namely - /2 < X < + /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:
/2. For this case, SIGNTAB does not provide information (?)
f ( X
⎧ ⎫
2 26
,
.
⎨ ⎬
2 26
⎩ ⎭
1
)
2
X 1
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