octave setround

[jorn . amundsen]

Could you consider including a setround function with Octave ? This is 
very useful with Interval Arithmetic. Matlab offers this in system 
dependent, to be made available with something like

    function setround(rnd)
        system dependent(’setround’,rnd);
    end

I know there have been several suggestions published earlier on the net. 
Please feel free to use my implementation as a starting point, available 
on http://folk.ntnu.no/joern/geilo-2010/setround.cc .

It looks like this when autoloaded into Octave:

> > help setround
`setround' is a function from the file /home/joern/src/setround.oct

 -- Loadable Function: OLD = setround (MODE)
     Set the processor floating-point rounding mode.  Returns the
     previous mode in OLD.

     The MODE argument specify how the results are rounded if not
     exactly representable, and may be one of:

    `-Inf'
          Round towards negative infinity (down).

    `0.'
          Round towards zero.

    `0.5'
          Round to nearest (default).

    `Inf'
          Round towards positive infinity (up).

     The return value is any of the above or -1 of not determinable.


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Rgds --Jorn Amundsen