# Plot a nx2 matrix as points

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Edited: Pranavkumar Mallela on 27 Jul 2023
Hello, I have different nx2 matrices as outputs from earhquake signals, where n can vary. I would like to plot these matrices as points where n is the number of points and the first and second columns contain the x and y value for each point. Let us say I have a matrix A as follow:
A[0.5 2; 1.0 -0.8; 1.5 -2.5]
Herein, (0.5,2), (1.0, -0.8), and (1.5, -2.5) would the coordinates of the points I would like to plot. Thank you for your response.

Torsten on 18 Jul 2023
Moved: Torsten on 18 Jul 2023
A=[0.5 2; 1.0 -0.8; 1.5 -2.5];
plot(A(:,1),A(:,2),'o')
Dyuman Joshi on 18 Jul 2023
One can also use scatter -
A = [0.5 2; 1.0 -0.8; 1.5 -2.5];
scatter(A(:,1),A(:,2),'r*')
axis('equal')
Thank you

Pranavkumar Mallela on 18 Jul 2023
Edited: Pranavkumar Mallela on 27 Jul 2023
Hi Jorge,
I understand that you want to plot the points obtained from a given nx2 matrix.
It can be done by extracting the x, y coordinates using array indexing. The graph can be plotted using the 'plot' function. Using '-*' in the 'plot' function will help you see the points.
A = [0.5 2; 1.0 -0.8; 1.5 -2.5]
A = 3×2
0.5000 2.0000 1.0000 -0.8000 1.5000 -2.5000
x = A(:,1)
x = 3×1
0.5000 1.0000 1.5000
y = A(:,2)
y = 3×1
2.0000 -0.8000 -2.5000
plot(x, y, '-*')
Hope this helps! Thanks!
Hi. Thank you for your answer. However, I do not want to plot a line, I just want to plot them as shaded points on top another plot that contains the earthquake signal as lines.

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