Error using vertcat Dimensions of arrays being concatenated are not consistent.

The problem seems to be with array concatenation. I dont understand how can this be fixed as I am not very fluent in Matlab

%Clear and clc commands to avoid data overwrite or damage
clear;
clc;
%Reading the .wav mono audio file as a "vector"
[s, F] = audioread('audiofile1.m4a');
%Setting the amplitude of the coming echos
A=0.9;
%Setting the vaule of the delay
L = 0.8*F;
%Generating and adding the echo
s = [s; zeros(20*L,1)];
sn = zeros(length(s),1);
sn=s+(A.*circshift(s,L));
%Playing the new echoed audio
sound(sn,F);
%Plotting the original plot versus the new one of the audios 
plot(s); 
subplot(2,1,1); 
plot(sn); 
subplot(2,1,2);

Error using vertcat

Dimensions of arrays being concatenated are not consistent.

Error in (line 11)

s = [s; zeros(20*L,1)];

[Sindar]

right before that line, run

size(s)

what does it output?

[Mahmoud Fadel]

thanks for the reply.

this is the output

ans =

      214976           2

[Sindar]

Then you can only horizontally catenate objects of size 214976xN to it. Looking closer, it's unclear what you plan to do with that line, since L is only coincidentally an integer

This would add a column of zeros to s:

s = [s; zeros(size(s,1),1)];

[Mahmoud Fadel]

I added this line but unfortunately it still isn't working

I tried another audio file and size(s) had only 1 column.

Could it be that audiofile1.wav isn't mono? if so, how can I read into s as such?

Answer 1

[Mahesh Taparia]

Hi

By looking at your code,

s = [s; zeros(20*L,1)];

you want to append the rows which consists of zeros. You have mentioned in the comments that the size of s is 214976X2. So the number of columns in appending rows should be 2, i.e it should be

s = [s; zeros(20*L,2)];