discrete time signal, i am not able to generate a function for the following question

clc;
clear all;
close all;
n= [1 7 5 6 4 5];
N1 = input('enter value for N1 :');
N2 = input('enter value for N2 :');
alpha = input('enter the value of alpha:');
figure(1)
x= alpha ^ (N1:n:N2);
stem(x)
xlabel('time')
ylabel('amplitude')
title('plot-1')

[Sean Faizal]

i am getting the error in equation

Answer 1

[Paul Hoffrichter]

Try this to fix the error:

N1 = 0;  N2 = 8; alpha = 0.8;
figure(1)
x= alpha .^ (N1:N2);
plot(x)