Have you spent time learning LabVIEW? There are several Tutorials listed on the first page of the Forum that explain the basic concepts, including Structures (Loops), Data elements (including Arrays and Clusters), and Graphs/Charts (and the difference between them).
The document you cited clearly explains how to do what you need to do. We cannot tell what you actually did, but clearly it was wrong. Do you want us to "guess" what you did, or do you want to attach your VI (please, no pictures, attach the actual Code so we can see it, modify it, test it, see the Version of LabVIEW you are using, etc.).
Bob Schor
