[R] matrix exponential: M^0
Peter Dalgaard
p.dalgaard at biostat.ku.dk
Tue Jan 20 16:58:35 CET 2004
Federico Calboli <f.calboli at ucl.ac.uk> writes:
> Dear All,
>
> I would like to ask why the zeroeth power of a matrix gives me a matrix
> of ones rather than the identity matrix:
Because arithmetic on a matrix works element-wise. M^2 is not equal to
M %*% M either (but is equal to M*M).
(R doesn't have the matrix exponential function. Lifting expm() from
Octave has been on my (virtual) TODO list for some time now...)
--
O__ ---- Peter Dalgaard Blegdamsvej 3
c/ /'_ --- Dept. of Biostatistics 2200 Cph. N
(*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907
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