## (“Multiply”)

Keyboard Access (all models): the key (the key below the key, not to be confused with the X X Y X*Y [[A×B matrix]] [[B×C matrix]] [[A×C matrix]] [[A×B matrix]] [B-element vector] [A-element vector]letterkey on theHP49/50).

Multiply, analytic function. AKA “times”.Numeric multiplication is commutative (that is, the order of the arguments doesn't matter).

For matrices to be compatible for multiplication, they must have the same inner dimension; that is, an A×

Bmatrix can only be multiplied by aB×C matrix (or a vector with B elements). Matrix multiplication is not commutative. Example:

Although the multiply

keylooks like the traditional×multiplication symbol, the multiplyoperatoris shown in the display as an asterisk to distinguish it from the letter X. Most other programming languages do this too. Example: multiplies X times Y, as does .

HP49/50maximum integer inputs: no limit, but multiplying huge integers takes a long time. For example, multiplying two 1000-digit-long numbers consisting only of 9’s( ) takes 14 seconds on anHP50g.BYTES: 2.5