want to create vector in output

Dear

i need help in get the output who solve the numbers by given formula and give output in vector form which have all data.....

x=[ 1 5 10 20 30 45];
 
n = numel(x); % number of elements in x
i=1;
for zzzz=1:n-1
   b=x(i+1);
   c=x(i);
   
   wavelengthacceleration=[b-c]
    i=i+1;
end

I need OUTPUT like

wavelengthacceleration = [4 5 10 10 15]

The above program show only final value of 15 in workspace.

Thank you

Answer 1

[Walter Roberson]

wavelengthacceleration = diff(x) ;

With no loops needed