[WP 34s] Matrix multiplication procedure - Printable Version +- HP Forums (https://www.hpmuseum.org/forum) +-- Forum: Not HP Calculators (/forum-7.html) +--- Forum: Not quite HP Calculators - but related (/forum-8.html) +--- Thread: [WP 34s] Matrix multiplication procedure (/thread-4203.html) [WP 34s] Matrix multiplication procedure - Marcio - 06-22-2015 10:32 PM 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 RE: [WP 34s] Matrix multiplication procedure - Thomas Klemm - 06-22-2015 11:30 PM 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 RE: [WP 34s] Matrix multiplication procedure - Marcio - 06-22-2015 11:38 PM (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.