How to count the number of times a value from a vector exceeded an interval?

Dear all,

I have this vector r = [1 2 4 5 6 3 2 7] and I want to count how many times each value exceeds the interval from 4-5. More detailed, after r(5) it should count 1, after r(6) it should count 2, after r(7) it should count also 2 because it counted it before since the previous value is lower than 4 and finally after r(8) it should count 3.

Thank you very much.

[Jan]

@Stergios Verros: It would help to understand your question, if you post the wanted output for the example input also.

Answer 1

[Rik]

The rules you want are a bit unclear, but if I understand them correctly, the code below should do what you want. If not, please give the desired output as a vector, not as text.

r = [1 2 4 5 6 3 2 7];
range=[4 5];

%Mark the positions exceeding the upper value:
L2=r>range(2);%The value should be greater than the bound
L2=L2&~[true L2(1:end-1)];%The previous value should not
%Do the reverse for the lower bound
L1=r<range(1);
L1=L1&~[false L1(1:end-1)];
output=cumsum(L1|L2);

[Stephen23]

Stergios Verros's "Answer" moved here:

Hi Rik,

Partially. If it could count also everything that is bellow 4 with the same way it would be fine I guess.

Thanks

[Rik]

See my edit

[Stergios Verros]

Hi Rik,

Now it counts every thing that it is outside the interval but I want to count only once until it is bigger than other side of the interval.

e.x. r(1) = 1 it is lower than 4 so it counts 1, r(2) = 2 it is lower that 4 but because it counted 1 before it should count again. If r(2) = 6 (larger than 5) then it should count again.

Does it make sense?

[Image Analyst]

No, not to me. Let's say r = [11 12 14 15 16 13 12 17]. What does "how many times each value exceeds the interval from 4-5" mean. It sounds like you're wanting a histogram when you say "how many times", but what's really confusing is "the interval from 4-5". So, for my example r, do you want

1. the number of values that exceed 4,
2. the number of times values exceed 5, or
3. the number of values that exceed 14 (which is element #4)?

Finally, what is your desired output?

Read this link

[Rik]

Did my last edit solve your question? If so, please consider marking it as accepted answer.

Answer 2

[Stergios Verros]

Thank you Rik!