can someone solve this?

impulse-----> h1 [n] = (0.8)n.u[n] ---------> h2 [n] = (0.3)n.u[n] ------>???

these are my two systems i have to get impulse response of the total system?

clc;

clear all;

h1n=[1,0.8,0.64,0.51,0.4096,0.327,0.262,0.209,0.167];

n= [ 0 1 2 3 4 5 6 7 8 9];

x = [ 1 1 1 1 1 1 1 1 1];

y= conv(h1n,x);

ny= 0: length(y);

subplot(2,1,1);

stem(ny,y);

i tried this code but i am getting error in length of stem

Answer 1

[Chidvi Modala]

stem(ny,y) plots the data sequence, y, at values specified by ny where ny and y should be of equal length. But in the provided code ny is a 1x18 vector where as y is a 1x17 vector. So, you can replace ny= 0: length(y); with ny= 0: length(y)-1;