Experts, please help to solve: Index in position 2 exceeds array bounds. Index must not exceed 9.Error in (line 30) if drumTable(sound,beat) == 1

% Define drum sounds

open_hihat = audioread('open_hihat.wav');

closed_hihat = audioread('closed_hihat.wav');

snare_drum = audioread('snare_drum.wav');

bass_drum = audioread('bass_drum.wav');

tom_toms = audioread('tom_toms.wav');

cymbals = audioread('cymbals_sound.wav');

% Define tempo and song length

fs=44100;

tempo = 130; % beats per minute

beatLength = 60/tempo; % length of one beat in seconds

numBeats = 457;

songLength = numBeats*1;

% Create drum machine table

drumTable = [0 1 1 1 0 0 0 1 1;

0 0 0 1 0 1 1 0 1;

0 1 0 1 1 0 0 1 1;

1 1 1 1 1 0 0 0 1;

0 0 0 1 0 1 1 0 1;

0 0 0 1 0 1 1 0 1];

% Create empty audio signal for the song

song = zeros(songLength*fs, 2);

% Generate the drum sounds for each beat

for beat = 1:numBeats

for sound = 1:size(drumTable,1)

if drumTable(sound,beat) == 1

switch sound

case 1

drumSound = open_hihat;

case 2

drumSound = closed_hihat;

case 3

drumSound = snare_drum;

case 4

drumSound = bass_drum;

case 5

drumSound = tom_toms;

case 6

drumSound = cymbals;

end

startIndex = round((beat-1)*beatLength*fs)+1;

endIndex = startIndex + size(drumSound,1) - 1;

song(startIndex:endIndex,:) = song(startIndex:endIndex,:) + drumSound;

end

end

end

% Normalize the song and save as a wave file

song = song/max(abs(song(:)));

audiowrite('drumMachineSong.wav', song, fs);

Answer 1

[Walter Roberson]

if drumTable(sound,beat) == 1

in order to have that test, then beat must not exceed the number of columns of drumTable. You initialize drumTable as 9 columns and you never expand it, so beat must be at most 9. But beat is potentially up to the number of beats which you assigned as a number greater than 400.

[Rizwan]

But I have to make the song length at least 2mins, how can I do it than, please help brother.

[Walter Roberson]

I would suggest to you that if you were to document the meaning of the rows and columns in the beat table, that you would have a clearer understanding of what needed to be done.