RankData

rank = RankData(data, alongDim, invalidRank)

Matlab function to rank each element of data.

Handles all data types accepted by matlab function unique.

Inspiration

Inspired by procrastination and this pick-of-the-week blog post to create a simple function that ranks data but simpler, much faster, and without the limitations from the previous submission.

Params

• alongDim [default []] - If empty, rank across all entries. If not empty, rank along entries for the specified dim
• invalidRank [default NaN] - Value invalid entries are set to.

Examples

Example 1

data = randn(2,3,4);
rank = RankData( data )

Example 2

Shows how repeated and invalid entries are handled.

data = [10 nan 11 nan nan 1 2 5 1 7];
rank = RankData(data)

Example 3

Shows how data types like categorical and its invalid data can be naturally handled.

data = randn(5);
data = discretize(data,linspace(0,1,10),'categorical');
rank = RankData(data)

Example 4

Output similar to tiedrank. While we demonstrate matched results, RankData can handle non numeric entries.

data = rand(3,4,2);
data(3,:,:) = data(2,:,:); % Match entries to force ties
alongDim = 1;
rank = tiedrank(RankData(data,alongDim));
isequal(rank,tiedrank(data))