Would be great to have it clarified in the manual.
I think I've brought this up before, and if there was a consensus I don't
recall it. In my opinion, the various usages of "dims" and "region" in the
manual and help are pretty confusing. It would be nice to standardize
terminology. I confess to being fond of talking about the "axes" of an array,
but I am fine with other choices too.
--Tim
On Friday, October 10, 2014 07:29:06 AM K Leo wrote:
> Thanks to both for explanations. "along dimensions in region" sounds
> pretty confusing to me. Can that be stated more clearly? Pardon my
> English.
>
> I guess this is what I wanted.
>
> julia> [std(A[i:i+9]) for i=1:length(A)-9]
> 91-element Array{Any,1}:
> 0.395761
> 0.391694
> 0.392545
> 0.363307
0.392545
> ⋮
> 0.322292
> 0.325662
> 0.345799
>
> On 2014年10月10日 07:17, Simon Kornblith wrote:
> > Or alternatively:
> >
> >
> > std(reshape(A,10,div(length(A),10)),1)
> >
> >
> > Simon
> >
> > On Thursday, October 9, 2014 7:10:11 PM UTC-4, Patrick O'Leary wrote:
> > "optionally *along dimensions in region*" (emphasis mine). You are
> > attempting to read along the tenth dimension of the array.
> >
> > You're trying to split the array into groups of ten elements, it
> > sounds like.
> >
> > [std(A[10(n-1)+1:10n]) for n in 1:length(A)./10]
> >
> > On Thursday, October 9, 2014 5:56:01 PM UTC-5, K leo wrote:
> > I am hoping to get the std's of every 10 consecutive elements
> > in A.
> >
> > std(v[, region])
> > Compute the sample standard deviation of a vector or array v,
> > optionally
> > along dimensions in region. The algorithm returns an estimator
> > of the
> > generative distribution’s standard deviation under the
> > assumption that
> > each entry of v is an IID drawn from that generative
> > distribution. This
> > computation is equivalent to calculating sqrt(sum((v -
> > mean(v)).^2) /
> > (length(v) - 1)). Note: Julia does not ignore NaN values in the
> > computation. For applications requiring the handling of
> > missing data,
> > the DataArray package is recommended.
> >
> > On 2014年10月10日 06:49, Patrick O'Leary wrote:
> > > On Thursday, October 9, 2014 5:42:40 PM UTC-5, K leo wrote:
> > > julia> std(A, 10)
> > >
> > > A only has elements along the first dimension. What behavior
> >
> > do you
> >
> > > expect here?
