To change the font size, set the “FontSize” property for the axes. Since many plotting functions reset axes properties, including the font size, set the "FontSize" property after plotting.
For example, the code below sets the font size to 16 points. The tick labels use the specified font size. The title and axis labels use a slightly larger font size.
plot(1:10)
title('My title')
xlabel('My label')
ax = gca;
ax.FontSize = 16;
Alternatively, if you want more individual control over the font size, you can specify the “FontSize” property as name-value pair to the “title” and “xlabel” functions, as in the example below.
plot(1:10)
title('My title','FontSize',16)
xlabel('My label','FontSize',10)
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