# HP Forums

Full Version: [WP 34s] Matrix multiplication procedure
You're currently viewing a stripped down version of our content. View the full version with proper formatting.
Hello all,

Would you be kind enough as to explain with an example how to do matrix multiplication in the 34s? So far I have only been able to invert them, mostly because all it takes is store the data in \(R_n\) and then call \(M^{-1}\) with the descriptor in \(x\). Quite easy.

As to multiply matrices, the manual says the descriptors should be in \(z\) and \(y\), the problem however is that I don't quite understand what should be in \(x\).

Very much appreciated.

Marcio
WP 34S pocket reference

M×                z y x → r
Take two matrix descriptors y and z, and the
integer part of x as the base address of the re-
sult. Returns (Z)·(Y)=(X). All calculations are
done in internal high precision (39 digits).
The fractional part of x is updated to match
the resulting matrix - no overlap checking is
performed.

(06-22-2015 10:32 PM)Marcio Wrote: [ -> ]the problem however is that I don't quite understand what should be in \(x\).

That is the matrix-descriptor of the result. Make sure it doesn't overlap with z and y.

HTH
Thomas
(06-22-2015 11:30 PM)Thomas Klemm Wrote: [ -> ]
(06-22-2015 10:32 PM)Marcio Wrote: [ -> ]the problem however is that I don't quite understand what should be in \(x\).

That is the matrix-descriptor of the result. Make sure it doesn't overlap with z and y.

HTH
Thomas

Quite obvious after this little hint.
Reference URL's
• HP Forums: https://www.hpmuseum.org/forum/index.php
• :