Question

I am going to convert an array as [1 2 6 12 13 15 20 8 30 31] to range [1 2 3 4 5 6 7 8 9 10] in EXCEL or in MATLAB. Is there any function to do it? Is there any suggestion to convert this type of arbitrary range to definite range?

Answer 1

Solution for MATLAB

In MATLAB, unique can do the trick. For example:

A = [1 1 1 1 4 4 5 3 3 6 6 6 6 8]
[C, ia, ic] = unique(A);

Now ic holds the values that you’re looking for:

ic = 
    1    1    1    1    3    3    4    2    2    5    5    5    5    6

Also, you can remap ic to a new order if you wish to do so. For instance, here’s a new order similar to the one you suggested:

new_order = [1 3 2 4 6 5];
ic_new = new_order(ic);

which yields:

ic_new = 
    1    1    1    1    2    2    4    3    3    6    6    6    6    5

Hope that helps!