ploting 1D eigenvector using ffmatlib

I want to know is there any way to plot 1d eigenvector in MATLAB.

I am exporting the matrices from freefem++ and solving them for eigen value using eigs in MATLAB

I want to plot eigenvectors using ffdeplot but apparently all the functions in ffmatlib library is for 2D or 3D problem

Answer 1

[AKennedy]

Yes, you can plot a 1D eigenvector in MATLAB. Since the eigenvector is 1D, you can simply use the “plot” function to visualize it. Here are two examples you may refer to,

1. The eigenvector is plotted directly, where the index of each element is automatically used for the x-axis with markers (‘*’) connected by lines (‘-’).

% Generate a 1D eigenvector 
eigenvector = [1; 2; 3; 4; 5]; 
% Plot the eigenvector 
plot(eigenvector,'*-') 

2. We explicitly create x-axis values using the “length” function and plot the eigenvector as a line plot, with markers ('o') connected by lines ('-').

% Example 1D eigenvector 
eigenvector = [0.2, 0.5, 0.8, 0.9, 1.0, 0.9, 0.8, 0.5, 0.2]; 
% Create x-axis values 
x = 1:length(eigenvector); 
% Plot eigenvector as a line plot 
plot(x, eigenvector, 'o-'); % 'o-' for markers and lines 
xlabel('Index'); 
ylabel('Eigenvector Value'); 
title('1D Eigenvector Plot'); 
grid on; 

FYI:

Plot Function: https://www.mathworks.com/help/matlab/ref/plot.html

Length Function: https://www.mathworks.com/help/matlab/ref/length.html