[SciPy-user] sqrtm
Nils Wagner
nwagner at mecha.uni-stuttgart.de
Tue Oct 5 06:45:05 CDT 2004
Hi all,
An entry for sqrtm in help (linalg) is missing.
matrix Functions:
expm --- matrix exponential using Pade approx.
expm2 --- matrix exponential using Eigenvalue decomp.
expm3 --- matrix exponential using Taylor-series expansion
logm --- matrix logarithm
cosm --- matrix cosine
sinm --- matrix sine
tanm --- matrix tangent
coshm --- matrix hyperbolic cosine
sinhm --- matrix hyperbolic sine
tanhm --- matrix hyperbolic tangent
signm --- matrix sign
funm --- Evaluating an arbitrary matrix function.
help(linalg.sqrtm) yields
Help on function sqrtm in module scipy.linalg.matfuncs:
sqrtm(A, disp=1)
Matrix square root
If disp is non-zero display warning if singular matrix.
If disp is zero then return residual ||A-X*X||_F / ||A||_F
Uses algorithm by Nicholas J. Higham
How about
help (linalg.iterative)
help (linalg.iterative.*) where * = cg,cgs, qmr, gmres, bicg, bicgstab
is already available.
Nils
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