So I have this code: Code (Text): function ApproxSinDeriv(x,n) h=.5; for i = 0:n h; approx = (1/(2*h))*(sin(x+h)-sin(x-h)); error = abs(approx-cos(x)); h = h/2; A=[i,h,approx,error] end Basically, it's a three-point formula for approximating a derivative, where the variables n = the number of iterations, x = the input value for the sin function, i = iteration number, approx=the approximation of the derivative, and error = the difference between the actual derivative and the approximation. I put A equal to a matrix of these values, but the output comes out in 30 clunky, individual, one-row matrices. How would I go about putting this data in an array? That is, one nice clean matrix with 30 rows and 4 columns [i,h,approx,error]? Thanks! -Eric.