def set_margins(margin)
    set_margin_left(margin)
    set_margin_right(margin)
    set_margin_top(margin)
    set_margin_bottom(margin)
  end
def set_margins(margin)
    set_margin_left(margin)
    set_margin_right(margin)
    set_margin_top(margin)
    set_margin_bottom(margin)
  end
Set all the page margins to the same value in inches.

 There are several methods available for setting the worksheet margins on
 the printed page:

     set_margins()        # Set all margins to the same value
     set_margins_LR()     # Set left and right margins to the same value
     set_margins_TB()     # Set top and bottom margins to the same value
     set_margin_left();   # Set left margin
     set_margin_right();  # Set right margin
     set_margin_top();    # Set top margin
     set_margin_bottom(); # Set bottom margin

 All of these methods take a distance in inches as a parameter.

 Note: 1 inch = 25.4mm. ;-) The default left and right margin is 0.75 inch.
 The default top and bottom margin is 1.00 inch.