When i try to calculate the convolution of two functions i get: Warning: Using only the real component of complex data.

m3=length(x3);
n3=length(h1);
X3=[x3,zeros(1,n3)];
H3=[h1,zeros(1,m3)];
for i=1:n3+m3-1
    Y3(i)=0;
    for j3=1:m3
        if(i-j3+1>0)
            Y3(i)=Y3(i)+X3(j3)*H3(i-j3+1);
        else
        end
    end
end
figure;
subplot(3,1,1); stem(x3, '-b^'); xlabel('n');
ylabel('x[n]'); grid on;
subplot(3,1,2); stem(h1, '-ms');
xlabel('n'); ylabel('h[n]'); grid on;
subplot(3,1,3); stem(Y3, '-ro');
ylabel('Y[n]'); xlabel('n'); grid on;
title('Convolution of Two Signals without conv function')

What can i do to plot the full real and imaginary parts

[Walter Roberson]

stem(real(x3)) and also stem(imag(x3)) with different colors or symbols, using hold on between the two calls.

[Deniz Bozdogan]

Sorry i could not understand can you explain a bit more please?

[Deniz Bozdogan]

I used plot instead of stem and it worked i am now getting the desired values

[Walter Roberson]

subplot(3,1,3); stem(Y3, '-ro');

change to

subplot(3,1,3);
stem(real(Y3), '-ro');
hold on 
stem(imag(Y3), '-r+') ;

if you changed it to

   plot(Y3, '-ro')

Then you will not get the output you need. When Y3 is complex that plot is treated as

plot(real(Y3),imag(Y3), '-ro')

which will deceive you about the coordinates.

[Deniz Bozdogan]

Thank you for your help

[Tesfaye Girma]

oh this question is real difficult to me also