MATLAB: How can i plot the line in different colours

plot line in different colours

close all; clear all; clc;
x = -5:0.01:5;
y = zeros(1,length(x));
for i = 1:length(x)
    if(x(i) < -1)
        y(i) = x(i) + 2;
        hold on
    elseif(x(i) <= 2 )
        y(i) = x(i)^2;
        hold on
    elseif(x(i) > 2)
        y(i) = -2*x(i) + 8;
        hold on
    end
end
plot(x,y)

Best Answer

Just plot three different lines and give them each a colour rather than plotting them in a single instruction. You can also put the numbers into the vector without requiring a for loop too e.g.
cond1 = x < -1;
cond2 = x >= -1 & x <= 2;
cond3 = x > 2;
y( cond1 ) = x( cond1 ) + 2;
y( cond2 ) = x( cond2 ).^2;
y( cond3 ) = -2 * x( cond3 ) + 8;
figure;
plot( x( cond1 ), y( cond1 ), 'r' )
hold on
plot( x( cond2 ), y( cond2 ), 'g' )
plot( x( cond3 ), y( cond3 ), 'b' )
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