Changing color of graphs in MATLAB plot

I have a basic plot command that is in a loop, and each iteration spits out a graph on the same figure.

There would be about 7000+ plots overlayed on the same figure. I do not inted to use legend, rather I want to use the jet colormap to show the order.

how can I include the jet colormap function in the below command that plots the graphs

plot(timevals,B{k}(:,2),'LineWidth',1.1)

The current figure I get for about 10 iterations is that, I want consitent color changes

Answer 1

[Star Strider]

With 7000+ curves, it is unlikely that you are going to be able to distinguish them regardless of the colormap you use.

I would instead use plot3, and offset them slightly in the x-direction, leaving the others unchanged.

Example:

data = rand(5, 20);                                     % Data Vector Matrix
t = linspace(0, 1, size(data,2));                       % Time Vector Matrix
x = (0:size(data,1)-1)' * ones(1,size(data,2));         % Offset Vector Matrix

figure
plot3(x, t, data)
grid on

[Hans123]

Thanks again Star Strider, really appreciate the help. But if I also have a similar question with aorund 70 iterations - only 70 plots.

Very similar to the previous code,

plot(timevals,B{k}(:,2),'LineWidth',1.1)

How I can incoparate the jet colormap into this?

[Hans123]

...and my bad I meant to say 700+ curves, not 7000!

[Star Strider]

As always, my pleasure.

You are still not going to be able to distinguisn 700 curves, and even 70 are going to be a challenge.

With 70 curves, distinguishing the colormap will be easier.

Apparently, it is only possible to specify one color per line object, so a loop is the only way I can find to do what you want:

cm = colormap(jet(70));
data = exp(-(0:199)/150)+randn(70, 200)*0.01;           % Data Vector Matrix
t = linspace(0, 1, size(data,2));                       % Time Vector Matrix
x = (0:size(data,1)-1)' * ones(1,size(data,2));         % Offset Vector Matrix

figure
hold all
for k = 1:size(data,1)
    plot3(t, x(k,:), data(k,:), 'Color',cm(k,:));
end
hold off
grid on
view(30,30)
xlabel('Time')

This is for 70 curves. Make the appropriate changes for different numbers of them.

Answer 2

[Korosh Agha Mohammad Ghasemi]

%https://zil.ink/korosh                       -------- Ways to contact me ----------
% Korosh Agha Mohammad Ghasemi !
%  Chemical Engineering at Shiraz University
x=linspace(0,2,100);
figure;
for a=[0.1 0.5 1 2 4]
y=x.^a;     %The function is hypothetical
if a == 0.1    %Any color can be substituted
    y=x.^a;
    plot(x,y,'k')  %Now choose the color
    hold on
elseif a == 0.5
    y=x.^a;
    plot(x,y,'b')   %Now choose the color
    hold on
elseif  a==1
    y=x.^a;
    plot(x,y,'g')    %Now choose the color
    hold on
elseif a==2
    y=x.^a;
    plot(x,y,'r')   %Now choose the color
    hold on
elseif a==4
    y=x.^a;
    plot(x,y,'y')   %Now choose the color
hold on
grid on
end
end