Reading from Look up Tables

Hello Guys,

i have a Question about Look up Tables. I have a really big Problem with unterstanding them, so you may help me quite a bit. I have a 12x6x32 double look up table filled with data called Parameters. In a writen Script of a Teaching class, there is a "Set up Look-Up-Tables" function.

The first function is

Parameters_people = parameters(:,:,3:2:end-1);

i dont unterstand what 3:2:end-1 means. What does that mean?

Which one of the 32 Dimensions of the Table do i use? Can you give me a fast help?

Answer 1

[Image Analyst]

parameters is a 3D array. Colon notation is startingIndex:increment:stoppingIndex. So 3:2:end-1 means elements 3,5,7,9,.....(element before the last one). Let's say the array was 12x6x32 so the indexing means 3,5,7,9,11,13,15,17,19,21,23,25,27,29,31 (that's 15 planes).

And ":" means "all" so (:,:,3:2:end-1) means all rows and all columns of planes 3,5,...31.

So Parameters_people would be a 12x6x15 3-D array.