oct_interp function y = interp(x, q, n, Wc) y = interp(x, q) y = interp(x, q, n) y = interp(x, q, n, Wc) x: scalar or vector of complex or real numbers q: positive integer value, or logical n: positive integer, default value 4 Wc: non decreasing vector or scalar, starting from 0 uptill 1, default value 0.5 This is an Octave function. This function upsamples the signal x by a factor of q, using an order 2*q*n+1 FIR filter. The second argument q must be an integer. The default values of the third and fourth arguments (n, Wc) are 4 and 0.5 respectively.