Posted 08 February 2008 - 02:37 PM
I have a problem with classpad300, when I try to find the inverse of a 4 by 4 matrix I receive an error (insufficient memory)! Note that the matrix elements are variables i.e. a,b,c,d,...etc. not numbers.
Isn't 500KB of working RAM enough for this simple operation? Can any one lead me to a way finding that inverse of 4x4 MAT.
Posted 08 February 2008 - 02:42 PM
I've heard of problems with inverse matrices before on the ClassPad. Maybe it's because you're using an old OS. I think you need to upgrade the OS.
Posted 09 February 2008 - 11:23 AM
If your "variables" are really polynomials or other expressions rather than just letters standing for numbers there seem to be specialized methods for finding inveres:
Posted 09 February 2008 - 12:45 PM
Note that the variables i.e. (a, b, c, d, e, ?etc)where all cleared before the procedure so as to get the results in symbolic form (to derive a general form of an equation).
Posted 11 February 2008 - 03:52 AM
I tried it on Maple and on the TI-89 and the solved it withouth any problem, but I don't know why I'm receiving this message.
Posted 11 February 2008 - 02:48 PM
A hard integration may require more specialised algorithms. I don't think matrix inversion requires different algorithms according to the size of the matrix - just a scaling up. So whilst I don't know the reason for failing with an integration problem (it could be stack size, but it could be an algorithm failure), I suspect that the reason for the matrix inversion failure is keeping track of all the symbols, and where they are located in the final matrix, i.e., I think the memory outage occurs with the parsing stacks (there is just too much to keep track of within that provided stack).
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