How to plot an audiowave when they have two different vector lengths?

I want to find the plot of the following code but I keep getting an error saying the vectors must be of the same length. Its telling me the vector value for n is 1x190913double and z is 190912x1double. Is there a way to plot both of these together?

Thanks

n=0:1:190912;
h=0.1*(0.99).^n;
Fs=16000;
z=audioread('Audio1.wav'); 
a=conv(z,h);
variabl1=audioplayer(z,Fs); 
%play(variabl1);
variabl2=audioplayer(a,Fs); 
play(variabl2);
plot(n,z);

Answer 1

[Walter Roberson]

[z, Fs] = audioread('Audio1.wav'); 

n = 0 : size(Z,1)-1;
h=0.1*(0.99).^n;

a = conv(z, h);

variabl1=audioplayer(z,Fs); 
%play(variabl1);
variabl2=audioplayer(a,Fs); 
play(variabl2);
plot(n,z);

Note: you probably want

a = conv(z, h, 'same')