sqrt() of a Matrix in a DLD

[John W. Eaton]

On  5-Mar-2004, Al Niessner <address@hidden> wrote:

| I did a 'grep -i sqrt' in include/octave-2.1.52/octave and did not find
| anything that would indicate how to take the square root of a matrix. My
| m-file has sqrt(m) where m is a diagonal matrix. I could not find a
| similar function in the header files. Anyone know the correct syntax?

I think this came up on the list recently.  In Octave, mapper
functions like sqrt are implemented specially so that they can
properly handle conversion from real to complex, etc.  For example, if
you write

  sm = sqrt (m);

then sm will be complex if any element of m is negative.  Do you want
to preserve that behavior in your C++ function?

jwe



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