arrays in functions

I am sending a function a vector something like [1.2 1.4 1.6 1.8 2] into vector Actual_output

function sse=myfit(params,Input,Actual_Output)
global c
a=params(1);
b=params(2);
% c = params(3);
c = -1/atanh((exp(a*2*pi)-cosh(a*b*Actual_Output))/sinh(a*b*Actual_Output));

it appears in c.

How do I do the current value - the value before i.e Actual_Output(2)-Actual_Output(1)

Answer 1

[Oleg Komarov]

c = -1/atanh((exp(a*2*pi)-cosh(a*b*Actual_Output))./sinh(a*b*Actual_Output));

Actual_Output(2:end)-Actual_Output(1:end-1)