Re: std in NDArrays

[David Bateman]

repmat and std in the octave CVS have both been converted to work with
NDArrays..... John, can we have a release?

D.

According to Jonathan Stickel <address@hidden> (on 08/25/04):
> I was going to suggest the use of nanstd in the latest octave-forge:
> 
> 
> octave:13> help nanstd
> nanstd is the user-defined function from the file
> /usr/share/octave/2.1.57/site/m/octave-forge/statistics/nanstd.m
> 
> v = nanstd(X [, opt [, dim]]);
> nanstd is identical to the std function except that NaN values are
> ignored.  If all values are NaN, the std is returned as NaN. If there
> is only a single non-NaN value, the std is returned as 0.
> 
>         0:  normalizes with N-1 [default]
>                 provides the square root of best unbiased estimator of 
> the variance
>         1:  normalizes with N,
>                 this provides the square root of the second moment 
> around the mean
> 
> See also: nanmin, nanmax, nansum, nanmedian, nanmean
> 
> 
> However, I get an error that repmat can only make 2D matrices.  Is there 
> an update to repmat that will soon be available?
> 
> Jonathan
> 
> 
> Hugo Neto wrote:
> >
> >Dear All,
> > 
> >I'm facing another problem with the std (Standard Deviation) function. 
> >Because i have a three dimensional array and i would like to do a std in 
> >it along the 3º dimension.
> > 
> >For instance in Matlab:
> > 
> >realstate=std(state,0,3);        % std deviation along dimension 3
> > 
> >This will store in realstate variable the standard deviation on the 3º 
> >dimension
> > 
> >In Octave i reach the following statement:
> > 
> >"error: invalid conversion of NDArray to Matrix"
> > 
> >I guess that this function is not yet implemented with NDArray option 
> >in 2.1.57 Octave version. Do you know that?
> > 
> >Any solution to surpass this problem?
> > 
> >Thanks a lot,
> > 
> >Regards,
> > 
> >H.Neto
> 
> 
> 
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David Bateman                                address@hidden
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