org.ejml.dense.row.misc

Class TransposeAlgs_DDRM

java.lang.Object

org.ejml.dense.row.misc.TransposeAlgs_DDRM

public class TransposeAlgs_DDRM
extends java.lang.Object

Low level transpose algorithms. No sanity checks are performed. Take a look at BenchmarkTranspose to see which one is faster on your computer.

Constructor Summary

Constructors

Constructor and Description
TransposeAlgs_DDRM()

Method Summary

Modifier and Type	Method and Description
static void	block(org.ejml.data.DMatrix1Row A, org.ejml.data.DMatrix1Row A_tran, int blockLength) Performs a transpose across block sub-matrices.
static void	square(org.ejml.data.DMatrix1Row mat) In-place transpose for a square matrix.
static void	standard(org.ejml.data.DMatrix1Row A, org.ejml.data.DMatrix1Row A_tran) A straight forward transpose.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

TransposeAlgs_DDRM

public TransposeAlgs_DDRM()

Method Detail

square

public static void square(org.ejml.data.DMatrix1Row mat)

In-place transpose for a square matrix. On most architectures it is faster than the standard transpose algorithm, but on most modern computers it's slower than block transpose.

Parameters:

mat - The matrix that is transposed in-place. Modified.

block

public static void block(org.ejml.data.DMatrix1Row A,
                         org.ejml.data.DMatrix1Row A_tran,
                         int blockLength)

Performs a transpose across block sub-matrices. Reduces the number of cache misses on larger matrices. *NOTE* If this is beneficial is highly dependent on the computer it is run on. e.g: - Q6600 Almost twice as fast as standard. - Pentium-M Same speed and some times a bit slower than standard.

Parameters:

A - Original matrix. Not modified.

A_tran - Transposed matrix. Modified.

blockLength - Length of a block.

standard

public static void standard(org.ejml.data.DMatrix1Row A,
                            org.ejml.data.DMatrix1Row A_tran)

A straight forward transpose. Good for small non-square matrices.

Parameters:

A - Original matrix. Not modified.

A_tran - Transposed matrix. Modified.