Boolean Variables in Matlab

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Akashdeep Saluja
Akashdeep Saluja on 1 Jul 2013
Hi, I want to have a large 2D nxn array in which I want to store 0 or 1 at each cell, so basically a bit would do for one cell of a matrix. And the array I want to create have high dimensions so space is a constraint. So is there any thing which can provide bit access so that the whole program may run using decent memory.
Thanks
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Akashdeep Saluja
Akashdeep Saluja on 1 Jul 2013
@Walter: basically I want to use the matrix as a chromosome in Genetic Algorithm, if you are not familiar with Genetic Algorithms, I just need to swap some rows of a matrix with other matrix many times in the algorithm.

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Answers (1)

Jonathan Sullivan
Jonathan Sullivan on 1 Jul 2013
Edited: Jonathan Sullivan on 1 Jul 2013
No. MATLAB does not have any native bit sized data types. The best you are going to be able to do is to (without creating your own class) is use logicals, which esentially are bytes (8 bits). Also, do not use cell array if you are concerned about space. Each element in a cell array has a non-neglegable amount of overhead to define the size, shape, and type of the data it stores.
help logical
doc logical
  3 Comments
James Tursa
James Tursa on 1 Jul 2013
Edited: James Tursa on 1 Jul 2013
FYI, doing anything that changes the non-zero locations of a sparse matrix will in all likelihood lead to copying the entire underlying dataset to new memory. I.e., each and every operation you do that changes the non-zero locations will cause an entire dataset copy to take place. This will drag your performance considerably depending on the sizes involved.

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