%% quartic_plot plots the quartic function.
%
a = -2.0;
b = 2.0;
x = linspace ( a, b, 101 );
y = quartic ( x );

clf ( );
hold ( 'on' );
plot ( x, y, 'linewidth', 3 );
plot ( [a,b], [0,0], 'k-', 'linewidth', 3 );
hold ( 'off' );

grid ( 'on' );
xlabel ( '<-- x -->' );
ylabel ( '<-- quartic(x) -->' );
title ( 'quartic function' );

print ( '-dpng', 'quartic.png' );
