How to replace a character in matlab

I want to use the string v in the audiofile name etc in the code below (all the v's). Tried with num2str() but that works probably just for numbers?

vocals=["a"; "e"; "i"; "o"; "u"; "y"; "ae"; "oe"; "aa"];
 for i=1:9
    v=vocals(i)
    [v, Fs] = audioread('v.wav');
    v_filter=lpc(v, 9);
end;

Answer 1

[Stephen23]

vocals = ["a"; "e"; "i"; "o"; "u"; "y"; "ae"; "oe"; "aa"];
for k = 1:numel(vocals)
    fnm = sprintf('%s.wav',vocals(k));
    [v, Fs] = audioread(fnm);
    v_filter = lpc(v,9);
end

https://www.mathworks.com/help/matlab/import_export/process-a-sequence-of-files.html

[Stina Ravdna Lorås]

Wonderful! Thank you!! :)

[Stephen23]

@Stina Ravdna Lorås : please accept my answer if it helped you!

[Stina Ravdna Lorås]

I'm sorry, I didnt realize I had to. Now it is accepted :) Thank you again :)

Stina