I have a vector and I want to make a while condition for its error.

I want to make abs(z(i+1)-z(i))/abs(z(i))<0.0001 in every iteration, but I don't know how to make the iteration run all the numbers in the vector z!

Can you please help me?

Answer 1

[Jan]

Without a loop:

result = abs(diff(z) ./ abs(z(1:end-1))) < 0.0001

[EDITED, typos fixed]

[Azzi Abdelmalek]

Simon. ) is missing.

. / instead /

[Jan]

Thanks, Azzi.

Answer 2

[Azzi Abdelmalek]

z=rand(10,1);
for i=1:length(z)-1
  if abs(z(i+1)-z(i))/abs(z(i))<0.0001
      res(k)=1 %for example
  else
      res(k)=0
  end
end

Answer 3

[David]

Thanks :)

Answer 4

[David]

Despite all the help, I have a further issue.

The output of abs(diff(z)) comes in, for example, 200x1 double

The output of abs(z(1:end-1)) comes in 200x1 double too.

How can I divide (1,1) by (1,1), (2,1) by (2,1) and etc..?

If i do (top part) / (bottom part) it comes 200x200 double with a lot of zeros.

[Azzi Abdelmalek]

 z=rand(200,1)
 result = abs(diff(z)) ./ abs(z(1:end-1)) < 0.0001