Question

Waht i need to do is take a single dimensional array, ie:

[1, 1, 2, 2, 3, 3]

and turn it into an array of points:

[[1, 1], [2, 2], [3, 3]]

I am hoping for a simple native matlab way of doing it rather then a function. This will be going into sets of points ie:

[ [[1, 1], [2, 2], [3, 3]],
  [[4, 4], [5, 5], [6, 6]],
  [[7, 7], [7, 7], [8, 8]] ]

The reason this is going to happen is the points will be stored in a text file as a single stream and i need to turn them into something meaningful.

Answer 1

First note that a horizontal concatenation of row vectors will result in one larger row vector rather than in a row of pairs, that is [[1, 1], [2, 2], [3, 3]] is the same as [1 1 2 2 3 3]. Hence, you need to concatenate them vertically.

You can try

a = [1, 1, 2, 2, 3, 3];

b = reshape(a, 2, floor(length(a)/2))';

This will result in a matrix where each row represents the coordinates of one point.

b =

     1     1
     2     2
     3     3