How to set the plot in matlab to a specific size?

 Generally, I wish to plot a rather complex x-y plot (lots of overlapping curves) to an A3 format so: 

 

A4 210x297  
A3 = A4*2 = 420 x 297  
... - 10mm each side = 400 x 277 (size of desired plot window)

What is the easiest way to set the size of the plot so it fits that size when printed in PDF (or any other common output format)?  

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Answers: 
As @LewisNorton explained, you need to set the Paper*** properties of the figure. Below is an example for producing a PDF file with dimensions 420 x 297 mm (A3 size), where the margins between the plot and the file borders are 10 mm each (top,bottom,left,right). 
 
%# centimeters units
X = 42.0;                  %# A3 paper size
Y = 29.7;                  %# A3 paper size
xMargin = 1;               %# left/right margins from page borders
yMargin = 1;               %# bottom/top margins from page borders
xSize = X - 2*xMargin;     %# figure size on paper (widht & hieght)
ySize = Y - 2*yMargin;     %# figure size on paper (widht & hieght)

%# create figure/axis
hFig = figure('Menubar','none');
plot([0 1 nan 0 1], [0 1 nan 1 0]), axis tight
set(gca, 'XTickLabel',[], 'YTickLabel',[], ...
    'Units','normalized', 'Position',[0 0 1 1]) 
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