Arrays have incompatible sizes for this operation.

i have the following code which mixes two audios as the user enters the number he wants to mix

freq = str2double(get(handles.edit3,'string'));
scnd = str2double (get(handles.edit10,'string'));
[y,Fs] = audioread("Sound and "+freq+" hz.wav"); 
[x,Fs] = audioread(scnd+".wav");
mix = y+x;
soundsc(mix,sample);
Nsamps = length(mix);
t = (1/Fs)*(1:Nsamps);          
y_fft = abs(fft(mix));           
y_fft = y_fft(1:Nsamps/2);      
f = Fs*(0:Nsamps/2-1)/Nsamps;   
axes(handles.axes3);
plot(f, y_fft)
xlim([0 5000])
ylim([0 5000])
end

some values seem to work while others dont and i get Arrays have incompatible sizes for this operation.

[Rik]

How do you guarantee there are the exact same number of samples in each wav file?

[Mohamed Turkmani]

how can i make the number of sample the same in each wav file?

[Mohamed Turkmani]

what is the solution so i can mix both files

Answer 1

[Mathieu NOE]

hello

in case the two files have different number of samples, either you truncate the longest one or you padd the shortest one (with zeros);

I opted for the second solution :

freq = str2double(get(handles.edit3,'string'));
scnd = str2double (get(handles.edit10,'string'));
[y,Fs] = audioread("Sound and "+freq+" hz.wav"); 
[x,Fs] = audioread(scnd+".wav");


%%
x = x(:); % make x col vector
y = y(:); % make y col vector

lx = numel(x);
ly = numel(y);

if ly>lx
    x = [x; zeros(ly-lx,1)];
elseif ly<lx
    y = [y; zeros(lx-ly,1)];
end
%%

mix = y+x;

% soundsc(mix,sample); % ?? 2nd argument should be Fs ? 
soundsc(mix,Fs); % please double check 2nd argument

Nsamps = length(mix);
t = (1/Fs)*(1:Nsamps);          
y_fft = abs(fft(mix));           
y_fft = y_fft(1:Nsamps/2);      
f = Fs*(0:Nsamps/2-1)/Nsamps;   
axes(handles.axes3);
plot(f, y_fft)
xlim([0 5000])
ylim([0 5000])

[Mohamed Turkmani]

i tried it by the way it works but the audio at the end repeats for couple of seconds

[Mathieu NOE]

hmm

I wonder if your files have one or more channels , so what are dimensions of x and y just after your read them

[y,Fs] = audioread("Sound and "+freq+" hz.wav"); 
[x,Fs] = audioread(scnd+".wav");

maybe your "echoes" are related to these lines I introduced , have to change that for multi channel audio (if that is the case) :

x = x(:); % make x col vector
y = y(:); % make y col vector