[jira] [Resolved] (MATH-1249) BlockRealMatrix BLOCK_SIZE value change

["Gilles (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/MATH-1249?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gilles resolved MATH-1249.
--------------------------
    Resolution: Invalid

> BlockRealMatrix BLOCK_SIZE value change
> ---------------------------------------
>
>                 Key: MATH-1249
>                 URL: https://issues.apache.org/jira/browse/MATH-1249
>             Project: Commons Math
>          Issue Type: Bug
>            Reporter: alberto trivellato
>            Priority: Minor
>
> Changing the value of the filed BlockRealMatrix.BLOCK_SIZE takes to a java.lang.ArrayIndexOutOfBoundsException in the method multiply(); The 
> thest is the following (aftre recompiling without the FINAL keyword for BlockRealMatrix.BLOCK_SIZE):
> public void testBlockRealMatrix() throws Exception{
> 		logger.debug("testBlockRealMatrix");
> 		
> 		long seed = 12345L;
> 		Random random = new Random(seed);
> 		int rows = 100;
> 		int cols = 100;
> 		double[][] data = new double[rows][cols];
> 		for(int i=0; i<rows; i++){
> 			for(int j=0; j<cols; j++){
> 				data[i][j] = random.nextDouble();
> 			}
> 		}
> 		
> 		BlockRealMatrix m1 = new BlockRealMatrix(data);
> 		BlockRealMatrix m2 = new BlockRealMatrix(data);
> 		
> 		BlockRealMatrix.BLOCK_SIZE = 52;
> 		long t0 = System.currentTimeMillis();
> 		m2.multiply(m1);
> 		logger.debug("time : " + (System.currentTimeMillis() - t0));
> 		
> 		BlockRealMatrix.BLOCK_SIZE = 26;
> 		t0 = System.currentTimeMillis();
> 		m2.multiply(m1);
> 		logger.debug("time : " + (System.currentTimeMillis() - t0));
> 		
> 		BlockRealMatrix.BLOCK_SIZE = 104;
> 		t0 = System.currentTimeMillis();
> 		m2.multiply(m1);
> 		logger.debug("time : " + (System.currentTimeMillis() - t0));
> 	}



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