Rewriting a file?

I need to add an string array (L in the code) to a couple of matlab files ; is there any function working like "writematrix" for .m scripts that we can use to rewrite the code?

Here is my code; the "writematrix" function does not work for it as I am modifying .m scripts:

nL=29;

L="Initial_Mat =[1 2 3];"; %this line should be added to the 29th line of 100 matlab files with fn directory

d=dir(fullfile('C:\Users\...','Testaindex*.m'));

for i=1:numel(d)

fn=fullfile(d(i).folder,d(i).name);

F=readlines(fn);

Ft=[F(1:nL);L;F(nL+1:end)];

writematrix(Ft,fn)

end

Thanks in advance.

[Stephen23]

"this line should be added to the 29th line of 100 matlab files with fn directory"

Why have so many (nearly) identical Mfiles? Having many many many copies of the same code is a strong indication that you are not using functions effectively: https://en.wikipedia.org/wiki/Code_smell

Answer 1

[Stephen23]

https://www.mathworks.com/help/matlab/ref/writelines.html

Tip for the future: you are already using READLINES, so scroll right to the bottom of the READLINES help and look at the list of "SEE ALSO" functions. The very first function listed is WRITELINES.