I am trying to plot a polygon with the coloring shaded with respect to a separate function. See code below taken from ``Area plot with gradient"--Patrick Kalita's answer on 16 Feb 2011:
% Define x, f(x), and M(x) x = linspace(0, 2*pi, 20)'; f = cos(x) + 2; M = x.^2; % Define the vertices: the points at (x, f(x)) and (x, 0) N = length(x); verts = [x(:), f(:); x(:) zeros(N,1)]; % Define the faces to connect each adjacent f(x) and the corresponding points at y = 0. q = (1:N-1)'; faces = [q, q+1, q+N+1, q+N]; p = patch('Faces', faces, 'Vertices', verts, 'FaceVertexCData', [M(:); M(:)], 'FaceColor', 'interp', 'EdgeColor', 'none')
If I save or print the image:
print -dpdf -r600 test1.pdf
I get lines going through the plot. See the figure here
Does anyone have a fix for this, or a reason why it happens? I've tried setting the patch so that there is only one face. The problem seems to be set in the 'interp' FaceColor. I've also tried setting the children edge color to none:
set(get(p,'children'), 'edgecolor', 'none')
however, this doesn't help.