fix x coordinates of airfoil in matlab

To fix the x-coordinates of an airfoil in Matlab, you need to load the data file of the coordinates and loop through the x-coordinates array and set its values to your desired value. Here's an example code:

main.m
% Load the coordinates file
coords = load('airfoil_coords.txt');

% Set the x-coordinates to a fixed value
fixed_x = 0.5;
for i = 1:length(coords)
    coords(i, 1) = fixed_x;
end

% Save the modified coordinates to a new file
save('fixed_airfoil_coords.txt', 'coords', '-ascii');
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In the code above, we load the airfoil coordinates from a file called airfoil_coords.txt. We then loop through the coordinates using a for loop and set the first column (which contains x-coordinates) to a fixed value of 0.5. Finally, we save the modified coordinates to a new file called fixed_airfoil_coords.txt.

Note that the file format of the airfoil coordinates should be a 2-column text file where the first column is the x-coordinates and the second column is the y-coordinates.