How to correctly plot a 6x2 grids of subplots

I have 6 images that I wish to plot them in a 6x2 grid of subplots.

I applied it as follow :

subplot(6,2,1)
%...
subplot(6,2,2)
%...
subplot(6,2,3)
%...
subplot(6,2,4)
%...
subplot(6,2,5)
%...
subplot(6,2,6)
%...

The issue is that MATLAB displayed a 6x2 grid of subplots but each image was extremelty small (about 1cm height in height and width). How can this be fixed?

Answer 1

[Rik]

You can also make a montage yourself.

The function below is from my unpublished toolbox replacement suite.

You still need an imshow after this call.

function I=noToolbox___montage(I,varargin)
%Slice up the image just as montage would have done.
%
%syntax:
% I=montage(I,'NoFigure',true)
%
% Setting the NoFigure to true will reshape the row*col*color*page input to a row2*col2*color
% image. The output has the same class as the input, and an attempt is made to preserve sparsity
% and complexity. The output is square, rounding up the number of columns when required, which
% follows the Matlab convention.
%
%Note that this doesn't actually replicate the montage function. Substantial edits are required to
%expand this code to be a full replacement.

if ~isequal(varargin,{'NoFigure',true})
    error('HJW:montage:NotImplemented','Only one syntax is supported, see documentation.')
end

%The below code is equivalent to black=zeros(size(I,1:3),'like',I);
black=eval([class(I) '(0)']);           %copy class
if issparse(I),black=sparse(black); end %copy sparsity
if ~isreal(I), black=complex(black);end %copy complexity
black=repmat(black, size(I,1),size(I,2),size(I,3) );
cols=ceil(sqrt(size(I,4)));rows=ceil(size(I,4)/cols);

I=mat2cell(I,size(I,1),size(I,2),size(I,3),ones(1,size(I,4)));
I=squeeze(I);
if numel(I)<(cols*rows)
    I( (numel(I)+1) : (cols*rows))={black};
end

I=reshape(I,cols,rows)';%Flip for column-first to row-first.
I=cell2mat(I);
end

[DGM]

Say, wouldn't happen to have a replacement for regionprops() in there too? :)

That one is kind of where my own IPT-workaround-todo list stopped.

[Rik]

I don't use regionprops often enough myself. Here is the current header. I wonder if there might be issues publishing this. I don't look at the Mathworks implementation when creating these alternatives, I just read the doc and test a few syntax options. It is low enough priority that I doubt I will ever publish this separately. I did include some of them in a minified form in the supplementary materials of a paper.

function varargout=noToolbox__IPT(functionname,varargin)
%Wrapper function for the Image Processing toolbox replacement functions.
%
% The implementations in this function library are all aimed to replicate the toolbox functions on
% all releases (ML6.5 up to current release) without any toolbox requirement. Limitations will be
% mentioned in the respective doc. Not every syntax may be implemented.
%
% NOTE: this library is not intended to be drop-in replacement for the toolbox. Toolbox functions
% undergo a lot more testing, validation and optimization than is possible for a library like this.
% I would suggest using this in a try-catch block where you try the toolbox function first.
%
% syntax:
% [___]=noToolbox__IPT(functionname,___)
%       noToolbox__IPT('help',functionname)
% The functionname must be a char array or a scalar string containing one of the implemented
% function names below.
%
% Functions:
% imopen
% imclose
% imdilate
% imerode
% bwlabel/bwlabeln
% bwdist
% montage

[DGM]

Fair nuff.

Answer 2

[Chunru]

You can use montage which remove the gaps of subplot axes. doc montage for more details.

% fileNames is the string array of images
montage(fileNames, 'Size', [6 2);

[Tarek Hajj Shehadi]

I unfortunately do not have the image processing tooblox

[Chunru]

then you can use "tiledlayout" which has more control of the layout. Here is the example from doc.

t = tiledlayout(2,2,'TileSpacing','Compact');

% Tile 1
nexttile
plot(rand(1,20))
title('Sample 1')

% Tile 2
nexttile
plot(rand(1,20))
title('Sample 2')

% Tile 3
nexttile
plot(rand(1,20))
title('Sample 3')

% Tile 4
nexttile
plot(rand(1,20))
title('Sample 4')