Subscripted assignment dimension mismatch // Overlap Save Method

I don't know why this happens

The code works fine for L = 5 only however I need to be able to vary L without issues

here is my code

clc;
clear all;
close all;

2nd order filter

filter_2 = firceqrip(2,0.6,[0.05 0.03]);

% impulse response in time & freq domains (order 2)
[h_2 t_2]= impz(filter_2);

% We are given 4 different frequencies 
freqs = [0.08, 0.2, 0.32, 0.4];
periods = 1./ freqs;

% Let the max value of t be 4 times the largest period
t_max = 4 * periods(1);

% Let us have 50 samples over the interval [0, t_max].
t = linspace(0, t_max, 50);

% The synthesized signal 
signal = sin(2*pi*0.08*t) + sin(2*pi*0.2*t) + sin(2*pi*0.32*t) + sin(2*pi*0.4*t);
x = signal;
h = h_2;
L=5;

% % Code to plot X(n)
% subplot (2,2,1);
% stem(x);
% stem(x,'blue');
% xlabel ('n');
% ylabel ('Amplitude');
% title('X(n)');
% 
% %Code to plot H(n)
% subplot (2,2,2);
% stem(h);
% stem(h,'black');
% xlabel ('n');
% ylabel ('Amplitude');
% title(' H(n)');

% Code to perform Convolution using Overlap Save Method
M=length(h);
lx=length(x);
r=rem(lx,L);
x1=[x zeros(1,L-r)];
nr=(length(x1))/L;
h1=[h' zeros(1,L-1)];
for k=1:nr
    Ma(k,:)=x1(((k-1)*L+1):k*L)
    if k==1
        Ma1(k,:)=[zeros(1,M-1) Ma(k,:)];
    else 
        Ma1(k,:)=[Ma(k-1,(L-M+2):L) Ma(k,:)];        
    end
     Ma2(k,:)=ifft(fft(Ma1(k,:)).*fft(h1));
end
Ma3=Ma2(:,M:(L+M-1));
y1=Ma3';
y=y1(:)'

% Representation of the Convoled Signal
figure
subplot (313);
plot(y,'red');
xlabel ('n');
ylabel ('Amplitude');
title ('Convolved Signal, using 4 samples');

your help is appreicated

[Guillaume]

Rather than letting us figure it out, can you post what the problem is. If an error message is displayed when you run your code, show us the whole error message (everything in red), particularly the bit that shows the line where the error occurs.

[MatlabGirl]

Hi, I'm sorry,

the error happens once I get in here::

for k=1:nr
    Ma(k,:)=x1(((k-1)*L+1):k*L)
    if k==1
        Ma1(k,:)=[zeros(1,M-1) Ma(k,:)];
    else 
        Ma1(k,:)=[Ma(k-1,(L-M+2):L) Ma(k,:)];        
    end
     Ma2(k,:)=ifft(fft(Ma1(k,:)).*fft(h1));
end

[MatlabGirl]

The error message says "Subscripted assignment dimension mismatch."

[MatlabGirl]

It happens only if L is not equal to 5 Which is weird

[Guillaume]

I'll repeat what I asked: show us the whole error message (everything in red), particularly the bit that shows the line where the error occurs.

What are the values of M, L, lx, r when the error occurs?

None of the variable names in your code mean anything, so it's near impossible to follow what's going on. The only variable with a meaningful name, signal, gets immediately renamed to x unfortunately.