Question

I have a 1×400 vector, I want to draw each 80 elements in different color with plot command, first 80 elements in blue, second 80 elements in green and so so.

Answer 1

The simplest way is to reshape the data so that you plot multiple columns simultaneously, like this:

x = 1:400;
y = x.^1.5;
plot(reshape(x,80,5), reshape(y,80,5))

If you need more control, you can either use the line command, or plot with hold on.