HP HP-15C - Error 1: Improper Matrix Operation; Error 2: Improper Statistics Operation

206 Appendix A: Error Conditions
 x or y is noninteger;
 x < 0 or y < 0;
 x > y;
 x or y 
10
.
Error 1: Improper Matrix Operation
Applying an operation other than a matrix operation to a matrix, that is,
attempting a nonmatrix operation while a matrix is in the relevant register
(whether the X- or Y-register or a storage register).
Error 2: Improper Statistics Operation
’
n = 0
S
n 
j
n 
L
n 
Error 2 is also displayed if division by zero or the square root of a negative
number would be required during computation with any of the following
formulas:
n
x
x


n
y
y


1)( 

n n
M
x
s
1)( 

n n
N
y
s
NM
P
r


M
P
A 
Mn
xPyM
B



 
Mn
xxnPyM
y




where:
M = nx
2
 x)
2
N = n
2
 )
2
P = nxy  xy
(A and B are the values returned by the operation
L, where y= Ax + B.)