How can I set subplot size in MATLAB figure?

 I often need to plot 10 images together, but using this code results in small images : 

 

img = rand(400,600); 
for i=1:10
 subplot(2,5,i); 
 imshow(img); 
 title(['Image ' int2str(i)]); 
end

As you can see, the images do not use all available space in the screen. How can I increase the size, or decrease the padding/margin between them? 

Thanks for any help.  

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Answers: 
I don't believe there is an easy way to do it. There are two options:
First, use the position part of the subplot: 
 
>> subplot(2,5, i, [l, b, w, h])
and calculate the left, bottom, width, height.
Or, get the handle of the returned axis: 
 
>> h(i) = subplot(2,5,i); 
nd then modify the axis afterward. 
 
>> set(h(1), 'position', [l, b, w, h] );
There are a number of pages that will give more detail, e.g., http://www.briandalessandro.com/blog/how-to-make-a-borderless-subplot-of-images-in-matlab/
[update]
The code below gives a little more detail on who you can do something like what you are looking for. It is a tad tedious. The 0.95 and 0.02 are just to give a little padding. They are nothing magical. :-)
One other thing to note is I would really encourage you to use "ii" as your index variable (or something else) as "i" is defined as sqrt(-1). It is a good convention not to use "i" and "j" as index variables (especially in Matlab). 
 
img = rand(400,600); 

figure(1);
clf();
hold on;

% Get the width and height of the figure
lbwh = get(1, 'position');  
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