read a list of audio from a folder for speech recognition

hi all, i am doing a project on speech recognition, i want to read a list of audio file one by one in order namely for example 'front-01.wav' 'back-01.wav'. these 01 file is the train samples while the test sample is for example 'front-02.wav' 'back-02.wav'. the coding i had now shows an error k = 1:length(C) Fs = 8000; [x,Fs] = audioread(strcat(C{k},'-01')); the error saying that Error using audioread (line 74) The filename specified was not found in the MATLAB path. can anyone help me to clear this out? thank you so much.