Add row and column headers to 3d matrix

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Kevin Teh 2018-12-13

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/435559-add-row-and-column-headers-to-3d-matrix

评论： Adam Danz 2018-12-14

采纳的回答： Adam Danz

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I'm trying to find a simple solution to add column and row headers. So I have:

Z(164,167,59) -3d matrix

names(1x164)-row header

names2(1x167) -column header

I tested to see if i can do a 2d and was going to add a loop using a horzcat as such:

ZHDR=[names2;Z(:,:,1)]

Thank you for any help.

Kevin

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Kevin Teh 2018-12-13

The goal was to get something like this is my other question:

https://uk.mathworks.com/matlabcentral/answers/435394-correlate-a-3d-array-into-n-times-2d-rows

I'm trying to create an index as such.

Kevin

Stephen23 2018-12-13

编辑：Stephen23 2018-12-13

"I'm trying to create an index as such"

All numeric arrays already have perfectly usfeul, simple, extremely efficient indices.

You explanation does not make it clear why you need to reinvent the wheel using something complex like you are trying to do, when there already exists something simpler and much more efficient (standard MATLAB indexing).

As Adam Danz already wrote, just keep your header, row, and numeric arrays separate, it will be much more efficient to work with. Or use a table. Or tell us what you are actually trying to achieve:

http://xyproblem.info/

https://meta.stackexchange.com/questions/66377/what-is-the-xy-problem

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采纳的回答

Adam Danz 2018-12-13

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/435559-add-row-and-column-headers-to-3d-matrix#answer_352189

编辑：Adam Danz 2018-12-13

在 MATLAB Online 中打开

This example creates row and column headers and puts your data and the headers into a cell array.

% Create fake data
Z = rand(164, 167, 59); 
% Generate headers
rowhead = strsplit(sprintf('row%d ', 1:size(Z,1)))';    %Column vector (ie, {'row1', 'row2', 'row3', ...})
rowhead(end) = [];
colhead = strsplit(sprintf('col%d ', 1:size(Z,2)));     %Row vector (ie, {'col1', 'col2', 'col3', ...})
colhead(end) = []; 
% Put matrix in a cell array, add headers. The upper left corner (Zc(1,1) will be empty)
Zc = cell(size(Z) + [1 1 0]);                       	%Create emtpy cell
Zc(2:end, 1, :) = repmat(rowhead, 1, size(Z,3));       %Place row headers in left "wall" of the 3D array.
Zc(1, 2:end, :) = repmat(colhead, size(Z,3), 1)';      %Place col headers in upper "ceiling" of 3D array.
Zc(2:end, 2:end, :) = num2cell(Z);                     %Fill the cell array with your data (time killer!)
% Test it
Zc(1,5)     %this should be col 4
Zc(21,1)    % this should be row 20 