daspect and get(gca,'position')

How can I get the true 'Position' of the axis that I modified with "daspect". When I type "get(my_axis,'Position')", the returned x-position and width are the same as before the "daspect" command, whereas the x-axis has been reduced (the limiting axis being the y-axis) ...

[florence renalier]

I add an example:

figure; subplot(414); imagesc(ones(10)); p1=get(gca,'position'); daspect([1 1 1]); p2=get(gca,'position');

--> I would like to be returned the position of the small square in which is now plotted my matrix ones(10), instead of the same as p1.