No Gap Next to Axis Label in Matlab?

Question

Matlab 2015b or Matlab 2016a.

I would like to have grid lines going across Subplot's spacing between the figures in order to evaluate better two pictures horizontally. However, I have a small gap between the two figures at the lower right-hand-side corner because which is misaligning the figures

where the gap is because of the 10^4 at lower right-hand-side corner. I would also like to have horizontal lines going across the spacing between the two figures, but I cannot do it before the gap problem is solved.

Code where the relative alignment is done as described in the answer here about the thread Tight subplot with colorbars and subplot's 3rd parameter in Matlab?

data=randi(513,513);
D=mat2gray(pdist(data, 'correlation'));

% Set normalized outer position (x,y,width,height)
ax1=axes('OuterPosition', [0 0.5 0.5 0.5]);
plot(D, 'Parent', ax1);
xlim([0 size(D,2)]);
set(cbar1, 'Visible', 'off')
title('Signal');

ax2=axes('OuterPosition', [0.51 0.5 0.5 0.5]);
plot(D, 'Parent', ax2);
set(ax2, 'XLim', [0, size(D,1)])
axis(ax2, 'square');
title('Corr pdist');

Output of Suever's answer

I tried unsuccessfully change two (2) in sprintf('%.2g', x) bigger and smaller

ax2 = axes('OuterPosition', [0.51 0.5 0.5 0.5]);
plot(D, 'Parent', ax2);
set(ax2, 'XLim', [0, size(D,1)])
axis(ax2, 'square');
title('Corr pdist');
cbar2 = colorbar(); % ax2 not needed here in brackets
set(ax2, 'XLim', [0 size(D,2)]);
set(cbar2, 'Visible', 'off')
grid minor;
% https://stackoverflow.com/a/35776785/54964
xticks = get(ax2, 'xtick');
labels = arrayfun(@(x)sprintf('%.2g', x), xticks, 'uniform', 0);
set(ax2, 'xticklabels', labels);

It gives

where those ticks are not XMinorTicks but simply ticks (wrongly marked in the picture). They are zero points at some points in the x-axis. When x-axis gets larger, MATLAB automatically adds new xtick marks but without complete labels. I think it would be better to have another symbol than zero there. How can you have some other mark than zero for incomplete labels of xticks?

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How can you align the 10^4 next to the last number in the second figure?

Answer 1

I would get the current xtick locations, convert those to strings, and then set the xticklabels property of the axes.

xticks = get(ax2, 'xtick');
labels = arrayfun(@(x)sprintf('%.2g', x), xticks, 'uniform', 0);
set(ax2, 'xtick', xticks, 'xticklabels', labels);

If you want them to dynamically be computed as the figure changes size (and the xticks get recomputed) you can link this code to the SizeChangedFcn of the figure.

func = @(varargin)set(ax2,'xticklabels',arrayfun(@(x)sprintf('%.2g',x),get(ax2, 'xtick'),'uni',0));
set(gcf, 'SizeChangedFcn', func)