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Thread Subject:
Fiinding standard deviation of a 3D point set

Subject: Fiinding standard deviation of a 3D point set

From: Anusha

Date: 4 Oct, 2012 02:45:12

Message: 1 of 3

Hi,

I have a mean point set, represented by 3D coordinates(x,y,z) in 3D matrix. There a another point set in 3D coordinates. How can I compute the standard deviation between the mean and another point set? I want to know how much the dispersion of the given point set from the mean point set.

Thanks.

Subject: Fiinding standard deviation of a 3D point set

From: TideMan

Date: 4 Oct, 2012 02:56:38

Message: 2 of 3

On Thursday, October 4, 2012 3:45:12 PM UTC+13, Anusha wrote:
> Hi,
>
>
>
> I have a mean point set, represented by 3D coordinates(x,y,z) in 3D matrix. There a another point set in 3D coordinates. How can I compute the standard deviation between the mean and another point set? I want to know how much the dispersion of the given point set from the mean point set.
>
>
>
> Thanks.

Not sure I understand exactly what you're getting at, but how about:
std(S1(:)-S2(:));
where S1 and S2 are the 3D matrices.

Subject: Fiinding standard deviation of a 3D point set

From: Anusha

Date: 4 Oct, 2012 03:08:06

Message: 3 of 3

TideMan <mulgor@gmail.com> wrote in message <663ae353-1482-4752-950f-74ce186064d9@googlegroups.com>...
> On Thursday, October 4, 2012 3:45:12 PM UTC+13, Anusha wrote:
> > Hi,
> >
> >
> >
> > I have a mean point set, represented by 3D coordinates(x,y,z) in 3D matrix. There a another point set in 3D coordinates. How can I compute the standard deviation between the mean and another point set? I want to know how much the dispersion of the given point set from the mean point set.
> >
> >
> >
> > Thanks.
>
> Not sure I understand exactly what you're getting at, but how about:
> std(S1(:)-S2(:));
> where S1 and S2 are the 3D matrices.

But S1 and S2 have different number of size. Its like S1 is Mx3 and S2 is Nx3.

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