FW: [Tcl-nap-users] index

[<Har...@cs...>]

-----Original Message-----
From: Davies, Harvey (CMAR, Aspendale)=20
Sent: Thursday, 4 May 2006 10:33
To: 'salah jubeh'
Subject: RE: [Tcl-nap-users] index

=20

-----Original Message-----
From: tcl...@li...
[mailto:tcl...@li...] On Behalf Of salah
jubeh
Sent: Wednesday, 3 May 2006 17:47
To: NAP
Subject: [Tcl-nap-users] index

=20

Hi all

=20

i would like to ask how can i use indeces to calculate statistical
function for the whole image like mean , percentile , mode ...

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For example I tried to calulate the max value for an aray extarcted from
an hdf file i do that on two steps

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nap "result=3D [nap_get hdf $img_src [nap_get hdf -list $img_src
{^[^:]*$}]]";

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nap "min1 =3D [nap "min(min(result))"]"

nap "max1 =3D [nap "max(max(result))"]"

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[>>>] The simplest and most general method is to reshape the array to a
vector as in the following:

[>>>] nap "vector =3D reshape(result)"

[>>>] [nap "min(vector)"]

[>>>] [nap "max(vector)"]

[>>>]=20

[>>>] For simple reduction functions (e.g. max()) you can avoid creating
another array by looping as follows:

[>>>]  nap "max1 =3D result"

[>>>]  while {[$max1 rank] > 0} {

[>>>]      nap "max1 =3D max(max1)"

[>>>]  }