Big Matrices operations by Valentín Albillo

The mighty HP15c CE can allow inversion of matrices of up to 8x8. The difference with the original is that the new one can have up to 3 8x8 matrices at the same time! This allows for quite big equation systems to be solved!

However, 8x8 is a hard limit, because the system used to keep track of the row changes only allows for 8 changes - meaning that bigger matrices may or may not work well, depending on the row changes done. Not that 8x8 is needed every day!

Valentí Albillo prepared a program to handle bigger matrices, by using partitioned matrices. It uses 4 matrices to handle the big matrix, and another for working. You can find the article here:

https://www.hpmuseum.org/forum/thread-20918.html?highlight=Albillo+matrices

It is extremely clever, and you can invert matrices as big as 13x13 in your humble calculator!