HP 15c Scientific manual Error 1 Improper Matrix Operation, Error 2 Improper Statistics Operation

206Appendix A: Error Conditions

x or y is noninteger;

x < 0 or y < 0;

x > y;

x or y ≥ 1010.

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 ≤ 1 j n ≤ 1 L n ≤ 1

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:

				=	∑ x
			x
					n
sx =		M					s y =	N
		n (n − 1)				n (n − 1)
A =	P				B =	M ∑ y − P ∑ x
	M						n ⋅ M
yˆ =	M ∑ y + P(n ⋅ x − ∑ x)
			n ⋅ M

y = ∑ y n

r =	P
	M ⋅ N

where:

M = nΣx2 – (Σx)2

N = nΣy2 – (Σy)2

P = nΣxy – ΣxΣy

(A and B are the values returned by the operation L, where y= Ax + B.)