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

[Sanju]

Hi AMIT,

I understand that you want to plot 1D eigen vector,

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,

EXAMPLE 1:

% Generate a 1D eigenvector 
eigenvector = [1; 2; 3; 4; 5]; 

% Plot the eigenvector 
plot(eigenvector,'*-') 

EXAMPLE 2:

% 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; 

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

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

You can also refer to the following documentation links for more information,

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

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

Hope this helps!