MATLAB: Can you make the output of this graph have multiple colors, like one timing bit is one color and the next one is another color.

Question

h = [1 1 0 1 0 1 0 1];
bitrate = 1;
n = 1000;
T = length(h)/bitrate;
N = n*length(h);
dt = T/N;
t = 0:dt:T;
x = zeros(1,length(t));
lastbit = 1;
for i=1:length(h)
    if h(i)==1
        x((i-1)*n+1:i*n) = -lastbit;
        lastbit = -lastbit;
    else x((i-1)*n+1:i*n) = lastbit;
    end
 end   
    d=plot(t,x);grid on;
    title('Line code POLAR NRZ-I');
    set(d,'LineWidth',2.5);
    axis([0 length(h) -1.5 1.5]);
    counter = 0;
    lastbit = 1;
for i = 1:length(t)
    if t(i)>counter
        counter = counter + 1;
        if x(i)~=lastbit
            result(counter) = 1;
            lastbit = -lastbit;
        else result(counter) = 0;
        end
    end
    
end
disp(result);

Answer 1

To plot in different colors you have to specify a linespec in plot, like

d=plot(t,x, 'r-', 'LineWidth', 2); % Plot red line of width 2.
d=plot(t,x, 'b-', 'LineWidth', 3); % Plot blue line of width 3.
d=plot(t,x, '-', 'LineWidth', 2); % Plot line of width 2 in next default color;

Here's a full demo:

numLines = 10
lineColors = jet(numLines);
x = linspace(0, 2*pi, 1000);
period = pi;
legendStrings = cell(numLines, 1);
for k = 1 : numLines
	y = sin(2*pi*x/(k * period));
	plot(x, y, '-', 'Color', lineColors(k, :), 'LineWidth', 3);
	hold on;
	legendStrings{k} = sprintf('Curve #%d', k);
end
grid on;
xlabel('x', 'FontSize', 20);
ylabel('y', 'FontSize', 20);
legend(legendStrings, 'Location', 'southwest');

Also see attached m-file for a different demo.