Divided difference in Newton's form error

Above in my function and below is my code to call function in Matlab Grader. The problem I have is that it is telling me the variable a must be a size of [1 6]. It is currently of size [1 5]. Check where the variable is assigned a value. Can anyone tell me how to adjust my a values which is also my coefficients in order to get the size [1 6]?

function a=dd(x,f) 
n = 4;
a = [-5, 2, -4, 8, 3];
end


a=dd([0, 1, -1, 2, -2], [-5, -3, -15, 39, -9]);

Answer 1

[Torsten]

Whatever your code is supposed to do, add a sixth element to the vector "a" in function "dd":

a = [-5, 2, -4, 8, 3, 6];

instead of

a = [-5, 2, -4, 8, 3];

[Daniel]

That would actulally make the variable a have an incorrect value. This what the code is suppose to do:

input: the function f(x) is given by its values stored in the row vector f at points stored in the row vector x. output: the program dd computes the vector of the coefficients a of the interpolating polynomial in the newton form.

[Torsten]

output: the program dd computes the vector of the coefficients a of the interpolating polynomial in the newton form.

Ok. Then give it a try.

The lines

n = 4;
a = [-5, 2, -4, 8, 3];

don't do that.