[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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