Create a matrix

Question

Creating a matrix of size[15088][15088][5] in java runs me out of heap space using int as a datatype. How would I create one? Using the command -Xmx did not help.

int[][][] a=new int[15088][15088][5];

@nithin kumar this is very big array it requires more than 4gb ram. — Madhawa Priyashantha
– Madhawa Priyashantha, Commented Mar 20, 2016 at 2:52

Community · Accepted Answer · 2017-05-23 12:23:47Z

2

If you use 15088 * 15088 * 5 size of array, then the array needs 15088 * 15088 * 5 * 4 bytes = 4.24 GB(approximately)** of heap size. If the data is sparsely distributed then you could use other data structures like described in the following references.

Memory-efficient sparse array in Java

edited May 23, 2017 at 12:23

CommunityBot

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answered Mar 20, 2016 at 2:53

Rishi

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2 Comments

Rishi Over a year ago

You to use OpenIntObjectHashMap from Colt library, which needs significantly lower memory, when compared to other alternatives.

Nithin Kumar Over a year ago

How do you create an arrays of array using list or hash set ?

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