- To: mathgroup at smc.vnet.net
- Subject: [mg32138] Matrix Series
- From: "Coleman, Mark" <mark.coleman at dri-wefa.com>
- Date: Sat, 29 Dec 2001 00:47:00 -0500 (EST)
- Sender: owner-wri-mathgroup at wolfram.com
Consider the familiar series expansion
Log[x] = (x-1) -1/2*(x-1)^2 + 1/3*(x-1)^3 - 1/4*(x-1)^4 + ....
I am interested in having Mathematica (v4.1) numerically evaluate an m-term
matrix counterpart to this expansion, e.g.,
Q[X_,m_] := (X-I) - 1/2*(X-I)^2 + 1/3*(X-I)^3 - 1/4*(X-I)^4 + ....
where X is an nxn real matrix and I is the nxn identity matrix, and m is
some positive integer.
I've been struggling with the built-in Series function, but it is not
obvious to me how to generalize it to handle matrix arguements. My other
alternative is to just to use the 'MatrixPower' function and build-up
the (alternating-sign) sequence of series coefficients in a Table
command, as I only need the numerical result. But my curiosity has been
piqued and I was wondering if there is someother way to do this.
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