Axes, lines, surfaces, and patches all have a 'LineWidth' property. The following describes the effect of the 'LineWidth' on each object:
---------Axes--------
Increases with width of all lines forming the X, Y, and Z axes. Note that this will change the thickness of the grid lines and the box around the 2-D plot. If this effect is not desired (i.e. you wish to only change the thickness of the X-axis across the bottom of the plot) you may wish to add a line object to the axes with the desired properties.
---------Line---------
Increases the width of the line. Note that if you are using markers, such as 'x', 'o', '*', '.', etc., you should use the MarkerSize property to adjust the point size of the markers. Setting the LineStyle produces undesired results.
-------Surface-------
Increases the width of the edges.
--------Patch--------
Increases the width of the edges.
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For example, to increase the size of the border around a patch object, do the following:
h = fill([1 1 2 2],[1 2 2 1],'r');
set(h,'LineWidth',10)
axis([0 3 0 3])
To increase the linewidth of the line object, do the following:
h = line([1 2],[4 7],'linestyle','--')
set(h,'LineWidth',1.2)
To increase the linewidth of a surface object, do the following:
h = surf(peaks)
set(h,'LineWidth',1.5)
Note the following limitation of MS-Windows:
"The specification for the graphics driver function CreatePen states that broken line styles are not supported for line widths greater than one."
