HP Prime Graphing Calculator - Manual (Page 424)

420 Functions and commands
stddevp Returns the population standard deviation of the elements in
a list or returns the list of standard deviations of the columns
of a matrix. The optional second list is a list of weights.
stddevp(Lst||Mtrx,[Lst])
Example:
stddevp([1,2,3])
gives
1
STEP Used in programming to indicate the step in an iteration or
the step size of an incrementation.
sto Stores a real or string in a variable.
sto((Real or Str),Var)
sturmseq Returns the Sturm sequence for a polynomial or a rational
fraction.
sturmseq(Poly,[Var])
Example:
sturmseq(x^3-1,x)
gives
[1,[[1,0,0,-
1],[3,0,0],9],1]
subMat Extracts from a matrix a sub matrix with first element=A[n1,n2]
and last element=A[n3,n4].
subMat(Mtrx(A),Intg(n1),Intg(n2),Intg(n3),Int
g(n4))
Example:
subMat([[1,2],[3,4],[5,6]],1,0,2,1)
gives
[[3,4],[5,6]]
suppress Returns a list without the nth element.
suppress(Lst,Intg(n))
Example:
suppress([0,1,2,3],2)
gives
[0,1,3]
surd Returns an expression to the power of 1/n.
surd(Expr,Intg(n))
Example:
surd(8,3)
gives
8^(1/3)