How to use interp1()?

I'm trying to interpolate an array of size nearly 2000. The step size I want is 'frequency'(size 101) and the array is 'ref_fft'. I'm unsure of the last argument. I want the interpolated array to be of size 101 but want to select a particular section from the original array (the corresponding values of 0 to 1 THz). Could someone please help me out with this?

i
%The resulting step size
xq = ((2*230)^-1).*frequency;
ref_fft = abs(fft(ref_ampl));
interpolated = interp1(frequency, ref_fft, xq);
plot(interpolated)
end

Thanks in advance

Answer 1

[Walter Roberson]

I suggest you construct xq using linspace()