Index exceeds the number of array elements. Index must not exceed 1.

I have this error and im not sure how to correct it. I have read through other similar Q&A's but cant seem to figure out how to fix the error.

ERROR MESSAGE:

Index exceeds the number of array elements. Index must not exceed 1.

Error in untitled2 (line 6)

t4 = (0:N-1)/fs2(k); % Time vector

CODE:

close all;
N = 512;                                     % Number of points, N
N2 = N/2;                                    % Half N
fs2 = 1000;                                  % Sample frequencies
for k = 1:2
t4 = (0:N-1)/fs2(k);                         % Time vector
f1 = (1:N)*fs2(k)/N;                         % Frequency vector
x4 = sin(2*pi*200*t4) + sin(2*pi*400*t4);    % Signal
y4 = sin(2*pi*200*t4) + sin(2*pi*900*t4);
Xmag = abs(fft(x4));                         % Magnitude spectrum
Ymag = abs(fft(y4));
plot(f1(1:N2),Xmag(1:N2),'r',f1(1:N2),Ymag(1:N2),'g');% Plot magnitude spectrum
end

Answer 1

[KSSV]

You are expecting fs2 to be of size 1*2. You have take k = 1,2 but your fs2 has only one value. Either take k = 1 alone or define fs2 as 1*2.

close all;
N = 512;                                     % Number of points, N
N2 = N/2;                                    % Half N
fs2 = [1000 2000];  %<---- changed here                       % Sample frequencies
for k = 1:2
t4 = (0:N-1)/fs2(k);                         % Time vector
f1 = (1:N)*fs2(k)/N;                         % Frequency vector
x4 = sin(2*pi*200*t4) + sin(2*pi*400*t4);    % Signal
y4 = sin(2*pi*200*t4) + sin(2*pi*900*t4);
Xmag = abs(fft(x4));                         % Magnitude spectrum
Ymag = abs(fft(y4));
plot(f1(1:N2),Xmag(1:N2),'r',f1(1:N2),Ymag(1:N2),'g');% Plot magnitude spectrum
end