My Math Forum 2 Q: about matrix

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 December 18th, 2009, 09:04 AM #1 Newbie   Joined: Dec 2009 Posts: 2 Thanks: 0 2 Q: about matrix hi all i need to determine the center of an given matrix nxn if n is odd, no problem but if n is even, there are ambiguous. what about the following procedure true center=n/2 is this logical ?? another question about matrix what's the types of matrix?, and when they should be used?. thanx in advance
December 18th, 2009, 02:12 PM   #2
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Hi;

Quote:
 i need to determine the center of an given matrix nxn if n is odd, no problem but if n is even, there are ambiguous. what about the following procedure true center=n/2 is this logical ??
I can't say. That idea would pick the matrix right in the center. One problem is that for n is odd you will always be picking a 1 X 1 matrix or essentially a scalar. While for n is even the central matrix would get larger and larger.Maybe, if you post what you are trying to do, we could get an idea.

Quote:
 another question about matrix what's the types of matrix?, and when they should be used?.
There are lots of types, all given names. Hermitian, banded , identity, singular, invertible, similar, upper triangular, lower triangular, sparse,strassen, characteristic, auxiliary, adjacent,stochastic, regular, absorbing...

They are used to get eigenvalues, roots of polynomials, solve simultaneous sets of equations, multiply polynomials and numbers quickly, solve probability problems, represent networks, solve clique problems and hundreds more. You might have to be more specific as each of these is a whole field by itself.

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