gauss seidel iterative linear system solver

this is a function that solve a linear system with gauss-seidel method

Function that solve linear system with gauss seidel method. Consider the linear system model:
A*x=b , the function sintax is:
[x,execution_time]=itergauss(A,b,n)
[x] is the solution vector
A is the linear matrix of the problem
b is the known term vector
n is the number of iterative approximation
execution_time is the time needed to solve the system