Texas Instruments TINSPIRE Reference Guide - Page 29

Criteria, value, ListOfCoeffs, List1, Vector1, countif, Catalog &gt, cPolyRoots, crossP

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countif( ) Catalog > countif(List,Criteria) ⇒ value Returns the accumulated count of all elements in List that meet the specified Criteria. Counts the number of elements equal to 3. Criteria can be: • A value, expression, or string. For example, 3 counts only those elements in List that simplify to the value 3. Counts the number of elements equal to "def." • A Boolean expression containing the symbol ? as a placeholder for each element. For example, ? Catalog > TI-Nspire™ Reference Guide 23

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TI-Nspire™ Reference Guide
23
countif()
Catalog >
countif(
List
,
Criteria
)
⇒
value
Returns the accumulated count of all elements in
List
that meet the
specified
Criteria
.
Criteria
can be:
•
A value, expression, or string. For example,
3
counts only those
elements in
List
that simplify to the value 3.
•
A Boolean expression containing the symbol
?
as a placeholder
for each element. For example,
?<5
counts only those elements
in
List
that are less than 5.
Within the Lists & Spreadsheet application, you can use a range of
cells in place of
List
.
Empty (void) elements in the list are ignored. For more information on
empty elements, see page 131.
Note:
See also
sumIf()
, page 100, and
frequency()
, page 39.
Counts the number of elements equal to 3.
Counts the number of elements equal to “def.”
Counts 1 and 3.
Counts 3, 5, and 7.
Counts 1, 3, 7, and 9.
cPolyRoots()
Catalog >
cPolyRoots(
Poly
,
Var
)
⇒
list
cPolyRoots(
ListOfCoeffs
)
⇒
list
The first syntax,
cPolyRoots(
Poly
,
Var
)
, returns a list of complex
roots of polynomial
Poly
with respect to variable
Var
.
Poly
must be a polynomial in expanded form in one variable. Do not
use unexpanded forms such as y
2
·y+1 or x·x+2·x+1
The second syntax,
cPolyRoots(
ListOfCoeffs
)
, returns a list of
complex roots for the coefficients in
ListOfCoeffs.
Note:
See also
polyRoots()
, page 74.
crossP()
Catalog >
crossP(
List1
,
List2
)
⇒
list
Returns the cross product of
List1
and
List2
as a list.
List1
and
List2
must have equal dimension, and the dimension must
be either 2 or 3.
crossP(
Vector1
,
Vector2
)
⇒
vector
Returns a row or column vector (depending on the arguments) that is
the cross product of
Vector1
and
Vector2
.
Both
Vector1
and
Vector2
must be row vectors, or both must be
column vectors. Both vectors must have equal dimension, and the
dimension must be either 2 or 3.