I need help with this. How can I use indices to extract non consecutive numbers.

I am new to this forum. I am learning how to navigate the program through the MATLAB Onramp. I am trying to use indices to extract non consecutive numbers

[Ameer Hamza]

Yes, you can easily extract them, so what is the problem? What forgot to mention the question.

[Adeena Daley]

Thanks for your response

How do you use indices to extract non consecutive numbers?

Answer 1

[Cris LaPierre]

If you are stuck on a task in MATLAB Onramp, click the "Show Solution" link under the task.

[Adeena Daley]

There are no solutions in the "Futher Practice" sections.

[Cris LaPierre]

True, there is not. That is because all the information you need has been covered in that lesson. Feel free to go back and review.

When the concepts are new, it can be hard to make the leap this further practice is asking for. This page in the documentation does a good job walking you through this.

[Jessie Callaghan]

Not on that one. There is no indication of how to correctly extract non-consecutive numbers. When putting in p=density(1,3,6) it does not work. When putting in p=density(1),(3),(6) it shows them as three separate numbers. I am assuming this should be one indice. The section does not cover that. Please help.

[per isakson]

>> density = 1:12;    % sample data, assuming density is a vector
>> density([1,3,6])   % 
ans =
     1     3     6
>> 

[Stephen23]

"There is no indication of how to correctly extract non-consecutive numbers."

In the very first section on this page (entitled "Indexing Vectors") the third example is introduced with this exact text "Or the subscript can itself be another vector:" and then proceeds to give the example code:

  v([1 5 6])      % Extract the first, fifth, and sixth elements
  ans =
        16   2   11

The first and fifth elements are clearly non-consecutive.

"I am assuming this should be one indice"

It is not clear what you mean by "one indice", but the example given on that page clearly shows one vector being used to obtain the non-consecutive elements, so you were thinking in the right direction.