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Thread Subject:
name for 3rd matrix dimension ?

Subject: name for 3rd matrix dimension ?

From: Ross Drewe

Date: 31 Aug, 1998 13:18:18

Message: 1 of 4

For 3D matrices: the 'common name' for a vector with index varying
along its first dimension is a 'column', the name for a vector along
its second dimension is a 'row', and a vector along its third dimension
is ... ? A drawer, perhaps? Is there a standard term - I haven't seen
one used, but surely there is one, given the very common use of 3D
matrices. Clearly it's not a page, which is the only 'common name'
involving the third dimension that I've seen in programs.

Ross Drewe

Subject: name for 3rd matrix dimension ?

From: Ken Davis

Date: 31 Aug, 1998 09:34:40

Message: 2 of 4

I've always heard and used the term "page". - Ken


Ross Drewe wrote in message <6sd4tl$3t4$1@possum.melbpc.org.au>...
>For 3D matrices: the 'common name' for a vector with index varying
>along its first dimension is a 'column', the name for a vector along
>its second dimension is a 'row', and a vector along its third dimension
>is ... ? A drawer, perhaps? Is there a standard term - I haven't seen
>one used, but surely there is one, given the very common use of 3D
>matrices. Clearly it's not a page, which is the only 'common name'
>involving the third dimension that I've seen in programs.
>
>Ross Drewe
>
>
>
>
>

Subject: name for 3rd matrix dimension ?

From: Roberto Celi

Date: 2 Sep, 1998 07:35:15

Message: 3 of 4

I use 'layer', but I don't think it's standard.

Roberto

Ross Drewe wrote:
>
> For 3D matrices: the 'common name' for a vector with index varying
> along its first dimension is a 'column', the name for a vector along
> its second dimension is a 'row', and a vector along its third dimension
> is ... ? A drawer, perhaps? Is there a standard term - I haven't seen
> one used, but surely there is one, given the very common use of 3D
> matrices. Clearly it's not a page, which is the only 'common name'
> involving the third dimension that I've seen in programs.

Subject: name for 3rd matrix dimension ?

From: Marcus.Hermann@urz.uni-heidelberg.de (Marcus Hermann)

Date: 3 Sep, 1998 19:10:29

Message: 4 of 4


A layer is the same thing as a page!
In MATLAB, I would call something like M(:,:,4711) a page or layer,
while M(4711,4711,:) has no name (although 'drawer' sounds pretty
cool...).

However, to my understanding, 'rows' and 'columns' in a 3D-Matrix are
no vectors, but two-dimensional matrices!
The 4711th line of M is M(4711,:,:), which is 2D.
The 4711th column of M is M(:,4711,:), which is 2D, too.

The tripel line-column-page (or line-column-layer) describes one
element.

-Marcus

Roberto Celi <celiNOSPAM@eng.umd.edu> wrote:

>I use 'layer', but I don't think it's standard.
>
>Roberto
>
>Ross Drewe wrote:
>>
>> For 3D matrices: the 'common name' for a vector with index varying
>> along its first dimension is a 'column', the name for a vector along
>> its second dimension is a 'row', and a vector along its third dimension
>> is ... ? A drawer, perhaps? Is there a standard term - I haven't seen
>> one used, but surely there is one, given the very common use of 3D
>> matrices. Clearly it's not a page, which is the only 'common name'
>> involving the third dimension that I've seen in programs.

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