Hey Tomer,
Looking at your question I'm unsure which of the two you're looking for:
1: A kind of "heat map" where the color of the line in the plot depends on the peak values at a certain point, or magnitude of your sine curve in the plot. Obviously, you can change the parameter you're working with to match what you would want to judge the "heat" or color scheme of your plots. So, instead of magnitude, you could instead look at frequency of your sine waves, etc.
f=[10 50 100];
T=1./f;
%A list of colors from hot to cold.
colors={[1 0 0.1],[0.6 0 0.6],[0.1 0 1]};
for i=1:length(T)
t(i,:)=linspace(0,2*T(i),10000);
subplot(3,1,i);
y(i,:)=sin(2*pi*t(i,:).*f(i));
%Grab the magnitude, but if there is more than one maximum
%grab the first one. We only care about the number.
temp_magnitude=(max(y(i,:))-min(y(i,:)));
magnitudes(i)=temp_magnitude(1);
ax(i)=plot(t(i,:),y(i,:),'--');
title(sprintf('y=sin(2*pi*t*%d)', f(i)));
hold on;
end
%Normalize magnitudes.
normalizedmags=magnitudes/max(magnitudes);
%Arrange the normalized magnitudes by value (low to high)
arrangednormmags=sort(normalizedmags,'descend');
%Loop through the normalized mags and set the proper color
for i=1:length(normalizedmags)
ax(i).Color=colors{find(arrangednormmags,normalizedmags(i))};
end
2: How to loop through an assign different colors. Here's what I have for you.
clc;clear all;close all;
f=[10 50 100];
T=1./f;
%Make a list of colors. You can get creative with this
%and make a "smart" loop or array process of some kind to
%generate unique colors, or find some kind of tableau list.
colors={[0.15 0.7 0.1],[0 0 0],[0.7 0.2 0.03]};
for i=1:length(T)
t(i,:)=linspace(0,2*T(i),10000);
subplot(3,1,i);
y(i,:)=sin(2*pi*t(i,:).*f(i));
%Assign the color when plotting.
plot(t(i,:),y(i,:),'--','Color',colors{i});
title(sprintf('y=sin(2*pi*t*%d)', f(i)));
hold on;
end
