Thread Subject:

filtering 2D plane data

Hi all,
I have values in location of 2D plane as follows.

p11 p12 p13 p14 p15
p21 p22 p23 p24 p25
p31 p32 p33 p34 p35
p41 p42 p43 p44 p45
p51 p52 p53 p54 p55

Now I want to filter the data from [5x5] matrix to [3x3] matrix in the
location of
p11 p13 p15
p31 p33 p35
p51 p53 p55

Is there any function that takes care of this in Matlab? How does this
decimation work?

I appreciate your hints and helps in advance.

-rAj

raj <rajkrai@gmail.com> wrote in message <87d84b3f-1341-442d-af41-a7ec76649edd@e18g2000yqc.googlegroups.com>...
> Hi all,
> I have values in location of 2D plane as follows.
>
> p11 p12 p13 p14 p15
> p21 p22 p23 p24 p25
> p31 p32 p33 p34 p35
> p41 p42 p43 p44 p45
> p51 p52 p53 p54 p55
>
> Now I want to filter the data from [5x5] matrix to [3x3] matrix in the
> location of
> p11 p13 p15
> p31 p33 p35
> p51 p53 p55
>
> Is there any function that takes care of this in Matlab? How does this
> decimation work?
>
> I appreciate your hints and helps in advance.
>
> -rAj

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See ‘Help’ ‘Matrix Indexing’.

To illustrate:

        p = rand(5)
        q = p(1:2:5, 1:2:5)

On May 26, 10:21