# How to plot a function

3 views (last 30 days)
Nouha Amine on 25 May 2022
Commented: Sam Chak on 25 May 2022
Hello,
I need to plot a graph with
where x is between and ,
y is here between and ,
Can you help me with it?
Thanks

Sam Chak on 25 May 2022
You can do something like this:
x = 0.1:0.01:10;
y1 = x.^(-2.9-0.1);
y2 = x.^(-2.9+0.1);
plot(x, y1, x, y2)
ylim([1e-8 1e0])
xlabel('x')
ylabel('y')
##### 2 CommentsShowHide 1 older comment
Sam Chak on 25 May 2022
That's strange... I've tested the code on both MATLAB and Octave. Try adding this:
clear all
close all
x = 0.1:0.01:10;
y1 = x.^(-2.9-0.1);
y2 = x.^(-2.9+0.1);
plot(x, y1, x, y2)
ylim([1e-8 1e0])
xlabel('x')
ylabel('y')
grid on

Fabio Freschi on 25 May 2022
You may use fplot
figure, hold on
fplot(@(x)x.^-3,[1 1e5])
fplot(@(x)x.^-2.8,[1 1e5])
% use bi-logaritmic scale
set(gca,'YScale','log','xScale','log')

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