Plotting polynomial functions

Octave uses a vector of the coefficients in descending order to represent a polynomial function. For example, consider this function:

• y = 3x² - 3x - 6

Polynomial functions can be plotted in an Octave script by using the polyval and plot commands.

p = [3 -3 -6]; x = -2:3; y = polyval( p, x ); plot( x, y );