HP Prime Graphing Wireless Calculator - Manual (Page 184)

180 Functions and commands
Boolean test, each element in the vector or matrix is tested and
the number of elements that pass the test is returned.
count(Var → Function, Matrix) or count(Var → Test, Matrix)
Examples:
count(x→x 2 ,[1 2 3]) returns 14
count(x→ x>1, [1 2 3]) returns 2
covariance Returns the covariance of the elements in a list or matrix.
covariance(List) or covariance(Matrix)
Example:
covariance
returns
covariance_
correlation
Returns a vector containing both the covariance and the
correlation of the elements of a list or matrix.
covariance_correlation(List) or
covariance_correlation(Matrix)
Example:
covariance_correlation
returns
cpartfrac Returns the result of partial fraction decomposition of a
rational fraction in the complex field.
cpartfrac(RatFrac)
Example:
cpartfrac
returns
crationalroot Returns the list of complex rational roots of a polynomial
without indicating the multiplicity.
crationalroot(Poly)
1 2
1 1
4 7
 
 
 
 
 
11
3
-------
1 2
1 1
4 7
 
 
 
 
 
11
3
-------
33
6 31 ⋅
-------------------
x
4 x
2
–
----------------
 
 
 
1
2
---
x 2 –
------------ –
1
2
---
x 2 +
------------- –