I have to increase the number of Fourier frequencies by adding 500 zeros to the end of the 27-sample-long signal.

fs = 250;

t = 0:1/fs:0.107;

L = length(t);

x1 = sin(2*pi*50*t)+0.3;

fftx1=fft(x1)

freqHz = (0:1:length(x1)-1)*fs/L;

plot(freqHz,fftx1,'-o')

I have to increase the number of Fourier frequencies by adding 500 zeros to the end of the 27-sample-long signal.

Answer 1

[Image Analyst]

This is a duplicate question. I answered it here:

https://www.mathworks.com/matlabcentral/answers/1570303-how-to-add-zero-points-in-a-function#comment_1797503

where I said to just assign the 527'th element to zero.

x1(527) - 0;