Create a function in MATLAB which adds two discrete time signals and outputs the resultant signal. The input and output arguments of the function should be:

function [y,n] = sigadd(x1,n1,x2,n2)

where, x1 and x2 are amplitude values of the input discrete time signals

n1 and n2 are time ranges for the input discrete time signals

y is the amplitude values of the output discrete time signal

n is the time range of the output discrete time signal