Please help with Index exceeds matrix dimensions error
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Christopher Carey
am 3 Dez. 2017
Kommentiert: Star Strider
am 3 Dez. 2017
%%here is my code
clc; close all;
N=50;
x = zeros(1,N);
for n = 1:length(x)
x(n)= sin((n/16)*pi);
end
y= zeros(1,N);
y(1)=-0.13;
for n = 2:length(x)
y(n+1)=(-1/3)*x(n+2)+(1/2)*x(n+1)+(1/3)*x(n)+y(n);
end
stem(0:1:50, y, 'r-');
xlabel('n');
ylabel('y[n]');
title('Output y[n] of the system');
pause;
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Star Strider
am 3 Dez. 2017
This will eliminate the error:
for n = 2:length(x)-2
y(n+1)=(-1/3)*x(n+2)+(1/2)*x(n+1)+(1/3)*x(n)+y(n);
end
however you have to change the stem arguments accordingly:
stem(0:1:49, y, 'r-')
2 Kommentare
Star Strider
am 3 Dez. 2017
As always, my pleasure.
You are indexing x(n+2) in your code, and ‘x’ has only 50 elements. In order to avoid reading beyond the number of elements in ‘x’, you need to reduce the number of iterations by 2. Setting the iterations to 2:length(x)-2 accomplishes that, since ‘n’ now goes from 2 to 48.
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