how to minus a sequence value

a=-4;
b=4;
x=a:1:b;
y=x.^2-4.*x;

from the above code, i will have value y= 32,21,12,5,0,-3,-4,-3,0

then, what i do do next is to find the difference between answer

ex:

abs|21-32|=11

abs|12-21|=9

abs|5-12|=7

and so on

Answer 1

[Rik]

The diff function will do what you want. You can use abs to get the absolute value.

[Noriham B]

tq...I really appreciate it...I am juz new to Matlab, learning from the internet

I have tried just now

to obtain the value 11,9 7.......and so on

just type

diff(y,1,2);

or diff(y);

both worked

but, what if I want to add, multiply and do other operations, is it possible sir?

let say now I want to do multiplication?

abs|21*32|=11

abs|12*21|=9

abs|5*12|=7

and so on

[Rik]

That is possible with indexing:

a=-4;
b=4;
x=a:1:b;
y=x.^2-4.*x;

mulitplied_values= y(1:(end-1)).*y(2:end);
result=abs(mulitplied_values);

disp(result)

   672   252    60     0     0    12    12     0