superimpose a line of slope (-5/3) on a log-log graph

Hello everybody,

Do you know how to draw a straight line with a certain slope on a log-log graph please?

Here what I want to do:

Thank you in advance,

Answer 1

[Davide Masiello]

See example below

clear,clc

x = [1e1,1e4];

slope = -3/5;
offset = 1;
y = slope*x+offset;

loglog(x,y,'--r')

[Mindy]

Thank you very much for your answers. So I try to modify my code like this:

x = [1e1,1e4];
slope = -3/5;
offset = 10;
y = slope*x+offset;

figure
loglog(freq,PSD,x,y)

But the slope doesn't appear... Do you know why?

[Davide Masiello]

Could you please share all of your code?