Most impressive/complex/amazing C-series program?

[Thomas Klemm]

(08-11-2018 07:01 PM)Dieter Wrote:  Just multiply the second equation by a₁₂/a₂₁ so that the matrix becomes symmetric.

This doesn't work though if \(a_{12}=0\) or \(a_{21}=0\).
But then you can rearrange the columns such that this is not the case:

\(\begin{bmatrix}
a&b\\
0&d
\end{bmatrix}
\begin{bmatrix}
x\\
y
\end{bmatrix}
=
\begin{bmatrix}
e\\
f
\end{bmatrix}\)

→

\(\begin{bmatrix}
b&a\\
d&0
\end{bmatrix}
\begin{bmatrix}
y\\
x
\end{bmatrix}
=
\begin{bmatrix}
e\\
f
\end{bmatrix}\)

If both \(c\) and \(d\) are \(0\) the system is degenerate and we probably don't even think of solving it with a calculator.

(08-11-2018 07:01 PM)Dieter Wrote:  This does not take more than

RCL 1 a₂₁ ÷ STO×0 STO×3

Handling all these cases properly gets probably a bit messy soon.

Cheers
Thomas