How can I plot two variables with the line color varying as the third variable?

My goal is to plot two variables, and vary the color of the lines by the third variable. I've done this before using scatter easily with the following code:

figure(2)
scatter(dist,geoPga,[],mag,'filled')
c = colorbar;
c.Label.String = 'Moment Magnitude, Mw'
xlabel('Hypocentral Distance to Station (km)')
ylabel('Geometric PGA (cm/s/s)')
title('Geometric PGA vs. Distance to Station')

But trying something similar with plot doesn't seem to work... Here is what I have tried so far...

    figure(1)
    plot(1./T,ScaledSa,[],log10stddev,'Filled')
    c = colorbar;
    c.Label.String = 'Standard Deviation'
    title('Target Spectrum & Scaled 
    Records','FontWeight','bold','FontSize',14)
    xlabel('Frequency (Hz)','FontWeight','bold','FontSize',12)
    ylabel('PSA (cm/s/s)','FontWeight','bold','FontSize',12)
    xlim([0 50])
    hold on

Essentially, I'm trying to show the standard deviation as the third variable... With a certain color lines representing small standard deviations, and a gradient of different colors up to a high standard deviation.

Any tips?

[Joan Vazquez]

Same need, this is so easy in e.g. R, no idea in Matlab...did you solve it?

Answer 1

[KSSV]

x = linspace(0,2*pi,1000) ;
y = sin(x);
z = zeros(size(x));
c = x;  % This is the color, vary with x in this case.
surface([x;x],[y;y],[z;z],[c;c],'facecolor','none','edgecolor','interp','linewidth',2);

[Bridger Baird]

This isn't what I'm looking for. This varies the color along a particular line. I have 68 total lines, and I want each line to be only one color. Each line has an associated standard deviation, and I want to plot the lines with the smallest standard deviation being green, with a scale, up to the largest standard deviation being red.

Answer 2

[darova]

Use patch

x = linspace(0,10);
y = sin(x);
c = jet(100);
n = length(x);
fv = [1:n-1;2:n]';
patch('faces',fv,'vertices',[x; y]',...
    'faceVertexCData',c,...
    'edgecolor','flat',...
    'linewidth',2)