HP49-HP50 (a, b) into 'a+bi'

[Gil]

Great, many thanks.

Now with matrix M
[[ 11 12 ]
[ 21 22 ]] in the stack,

we have two ways to replace
its element 22 by (2,2):

A) Transform M into a complex matrix
M (1,0) *
{2 2} (2,2) PUT

or B) Leave M real
& transform (2,2) into algebraic '(2,2)'
M
{2 2} (2,2) —>Q PUT

Your given solution B is cleaner (simpler)
or more appropriate.

Regards,
Gil