Organizing output in MATLAB

Providence88

So I have this code:

Code:

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.

*trambolin*

Code:

function [A] = ApproxSinDeriv(x,n)
A = zeros(n+1,4)
h=.5;
for i = 0:n
    approx = (1/(2*h))*(sin(x+h)-sin(x-h));
    error = abs(approx-cos(x));
    h = h/2;
    A(i+1,:)=[i,h,approx,error];
end

Providence88

Thank you! That worked great!

Similar Threads for: Organizing output in MATLAB
Thread	Forum	Replies
(MATLAB) Ignoring output arguments	Math & Science Software	6
Matrix Output (Matlab)	Math & Science Software	1
Self-organizing quantum universe explained in July SciAm feature	Beyond the Standard Model	47
Java project output problem. Can't output objects from a method.	Engineering, Comp Sci, & Technology Homework	0
Self organizing systems : Conway's The Game of Life	General Discussion	36

trambolin	Code: function [A] = ApproxSinDeriv(x,n) A = zeros(n+1,4) h=.5; for i = 0:n approx = (1/(2h))(sin(x+h)-sin(x-h)); error = abs(approx-cos(x)); h = h/2; A(i+1,:)=[i,h,approx,error]; end