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Problem 952. Unique: Enhanced Performance - Avoiding Memory Crash

Created by Richard Zapor

The Challenge is to create the unique array for a long and wide array.

Difficulties are that the normal unique(a,'rows') function call will suffer a Memory crash on Cody. c=randi(4,9000000,48,'uint8')-1;

The second part of the challenge is Execution Speed.

The data is small integer representing data permutations of items like DNA and Rubik's cube faces.

Input: Array of uint8 of dimensions (m, 48) with values 0:3

Output: Array Equivalent to unique(A,'rows')

Hints:

1) Columns can be merged to form a reduced number of columns 2) Unique has the option to provide an Array and a sorting Index

Problem Group

Solution Statistics

5 correct solutions 2 incorrect solutions
Last solution submitted on Jan 10, 2014