# Want to Plot a multi line graph in Matlab

4 views (last 30 days)
Vartika Agarwal on 31 May 2022
Commented: Sam Chak on 31 May 2022
I want to plot a graph like this. How can I implement it in Matlab ?

Sam Chak on 31 May 2022
Like this?
x = 2:0.01:16;
y1 = 15*x + 270;
y2 = (6.6964e-04)*x.^4 - (2.6786e-02)*x.^3 + (9.0625e-01)*x.^2 - (1.2768e+01)*x + 2.7211e+02;
y3 = (4.6503e-03)*x.^5 - (2.4368e-01)*x.^4 + (4.7656e+00)*x.^3 - (4.1525e+01)*x.^2 + (1.6586e+02)*x + 2.0000e+02;
plot(x, y1, 'linewidth', 1.5)
hold on
plot(x, y2, 'linewidth', 1.5)
plot(x, y3, 'linewidth', 1.5)
hold off
grid on
xlabel('Freq')
ylabel('Spectral') ##### 2 CommentsShowHide 1 older comment
Sam Chak on 31 May 2022
Modify the code for y1 only:
x1a = 2:0.01:8;
x1b = 8:0.01:10;
x1c = 10:0.01:16;
y1a = 15*x1a + 270;
y1b = 15*x1b + 270;
y1c = 15*x1c + 270;
plot(x1a, y1a, 'b-', 'linewidth', 1.5)
hold on
plot(x1b, y1b, 'b--', 'linewidth', 1.5)
plot(x1c, y1c, 'b-', 'linewidth', 1.5) R2018a

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