How can I 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

[Matt J]

L = length(t)+500;
fftx1=fft(x1, L)

Answer 2

[Image Analyst]

Duplicate question #3.

Previously answered here:

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