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A fast and easy to use dense and sparse matrix linear algebra library written in Java.
/*
* Copyright (c) 2009-2017, Peter Abeles. All Rights Reserved.
*
* This file is part of Efficient Java Matrix Library (EJML).
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.ejml.dense.block;
import org.ejml.data.FSubmatrixD1;
/**
*
* Math operations for inner vectors (row and column) inside of block matrices:
*
* scale: bi = α*ai
* div: i = ai/α
* add: ci = α*ai + βBi
* dot: c = sum ai*bi
*
*
*
* All submatrices must be block aligned. All offsets and end indexes are relative to the beginning of each
* submatrix.
*
*
* @author Peter Abeles
*/
public class VectorOps_FDRB {
/**
*
* Row vector scale:
* scale: bi = α*ai
* where 'a' and 'b' are row vectors within the row block vector A and B.
*
*
* @param A submatrix. Not modified.
* @param rowA which row in A the vector is contained in.
* @param alpha scale factor.
* @param B submatrix that the results are written to. Modified.
* @param offset Index at which the vectors start at.
* @param end Index at which the vectors end at.
*/
public static void scale_row(final int blockLength,
FSubmatrixD1 A, int rowA,
float alpha, FSubmatrixD1 B, int rowB,
int offset, int end)
{
final float dataA[] = A.original.data;
final float dataB[] = B.original.data;
// handle the case where offset is more than a block
int startI = offset - offset % blockLength;
offset = offset % blockLength;
// handle rows in any block
int rowBlockA = A.row0 + rowA - rowA % blockLength;
rowA = rowA % blockLength;
int rowBlockB = B.row0 + rowB - rowB % blockLength;
rowB = rowB % blockLength;
final int heightA = Math.min(blockLength,A.row1-rowBlockA);
final int heightB = Math.min(blockLength,B.row1-rowBlockB);
for( int i = startI; i < end; i += blockLength ) {
int segment = Math.min(blockLength,end-i);
int widthA = Math.min(blockLength,A.col1-A.col0-i);
int widthB = Math.min(blockLength,B.col1-B.col0-i);
int indexA = rowBlockA*A.original.numCols + (A.col0+i)*heightA + rowA*widthA;
int indexB = rowBlockB*B.original.numCols + (B.col0+i)*heightB + rowB*widthB;
if( i == startI ) {
indexA += offset;
indexB += offset;
for( int j = offset; j < segment; j++ ) {
dataB[indexB++] = alpha*dataA[indexA++];
}
} else {
for( int j = 0; j < segment; j++ ) {
dataB[indexB++] = alpha*dataA[indexA++];
}
}
}
}
/**
*
* Row vector divide:
* div: bi = ai/α
* where 'a' and 'b' are row vectors within the row block vector A and B.
*
*
* @param A submatrix. Not modified.
* @param rowA which row in A the vector is contained in.
* @param alpha scale factor.
* @param B submatrix that the results are written to. Modified.
* @param offset Index at which the vectors start at.
* @param end Index at which the vectors end at.
*/
public static void div_row(final int blockLength,
FSubmatrixD1 A, int rowA,
float alpha, FSubmatrixD1 B, int rowB,
int offset, int end)
{
final float dataA[] = A.original.data;
final float dataB[] = B.original.data;
// handle the case where offset is more than a block
int startI = offset - offset % blockLength;
offset = offset % blockLength;
// handle rows in any block
int rowBlockA = A.row0 + rowA - rowA % blockLength;
rowA = rowA % blockLength;
int rowBlockB = B.row0 + rowB - rowB % blockLength;
rowB = rowB % blockLength;
final int heightA = Math.min(blockLength,A.row1-rowBlockA);
final int heightB = Math.min(blockLength,B.row1-rowBlockB);
for( int i = startI; i < end; i += blockLength ) {
int segment = Math.min(blockLength,end-i);
int widthA = Math.min(blockLength,A.col1-A.col0-i);
int widthB = Math.min(blockLength,B.col1-B.col0-i);
int indexA = rowBlockA*A.original.numCols + (A.col0+i)*heightA + rowA*widthA;
int indexB = rowBlockB*B.original.numCols + (B.col0+i)*heightB + rowB*widthB;
if( i == startI ) {
indexA += offset;
indexB += offset;
for( int j = offset; j < segment; j++ ) {
dataB[indexB++] = dataA[indexA++]/alpha;
}
} else {
for( int j = 0; j < segment; j++ ) {
dataB[indexB++] = dataA[indexA++]/alpha;
}
}
}
}
/**
*
* Row vector add:
* add: ci = α*ai + βBi
* where 'a', 'b', and 'c' are row vectors within the row block vectors of A, B, and C respectively.
*
*
* @param blockLength Length of each inner matrix block.
* @param A submatrix. Not modified.
* @param rowA which row in A the vector is contained in.
* @param alpha scale factor of A
* @param B submatrix. Not modified.
* @param rowB which row in B the vector is contained in.
* @param beta scale factor of B
* @param C submatrix where the results are written to. Modified.
* @param rowC which row in C is the vector contained.
* @param offset Index at which the vectors start at.
* @param end Index at which the vectors end at.
*/
public static void add_row(final int blockLength ,
FSubmatrixD1 A , int rowA , float alpha ,
FSubmatrixD1 B , int rowB , float beta ,
FSubmatrixD1 C , int rowC ,
int offset , int end ) {
final int heightA = Math.min(blockLength,A.row1-A.row0);
final int heightB = Math.min(blockLength,B.row1-B.row0);
final int heightC = Math.min(blockLength,C.row1-C.row0);
// handle the case where offset is more than a block
int startI = offset - offset % blockLength;
offset = offset % blockLength;
final float dataA[] = A.original.data;
final float dataB[] = B.original.data;
final float dataC[] = C.original.data;
for( int i = startI; i < end; i += blockLength ) {
int segment = Math.min(blockLength,end-i);
int widthA = Math.min(blockLength,A.col1-A.col0-i);
int widthB = Math.min(blockLength,B.col1-B.col0-i);
int widthC = Math.min(blockLength,C.col1-C.col0-i);
int indexA = A.row0*A.original.numCols + (A.col0+i)*heightA + rowA*widthA;
int indexB = B.row0*B.original.numCols + (B.col0+i)*heightB + rowB*widthB;
int indexC = C.row0*C.original.numCols + (C.col0+i)*heightC + rowC*widthC;
if( i == startI ) {
indexA += offset;
indexB += offset;
indexC += offset;
for( int j = offset; j < segment; j++ ) {
dataC[indexC++] = alpha*dataA[indexA++] + beta*dataB[indexB++];
}
} else {
for( int j = 0; j < segment; j++ ) {
dataC[indexC++] = alpha*dataA[indexA++] + beta*dataB[indexB++];
}
}
}
}
/**
*
* Row vector dot/inner product:
* dot: c = sum ai*bi
* where 'a' and 'b' are row vectors within the row block vector A and B, and 'c' is a scalar.
*
*
* @param A submatrix. Not modified.
* @param rowA which row in A the vector is contained in.
* @param B submatrix. Not modified.
* @param rowB which row in B the vector is contained in.
* @param offset Index at which the vectors start at.
* @param end Index at which the vectors end at.
* @return Results of the dot product.
*/
public static float dot_row(final int blockLength,
FSubmatrixD1 A, int rowA,
FSubmatrixD1 B, int rowB,
int offset, int end) {
// handle the case where offset is more than a block
int startI = offset - offset % blockLength;
offset = offset % blockLength;
final float dataA[] = A.original.data;
final float dataB[] = B.original.data;
float total = 0;
// handle rows in any block
int rowBlockA = A.row0 + rowA - rowA % blockLength;
rowA = rowA % blockLength;
int rowBlockB = B.row0 + rowB - rowB % blockLength;
rowB = rowB % blockLength;
final int heightA = Math.min(blockLength,A.row1-rowBlockA);
final int heightB = Math.min(blockLength,B.row1-rowBlockB);
if( A.col1 - A.col0 != B.col1 - B.col0 )
throw new RuntimeException();
for( int i = startI; i < end; i += blockLength ) {
int segment = Math.min(blockLength,end-i);
int widthA = Math.min(blockLength,A.col1-A.col0-i);
int widthB = Math.min(blockLength,B.col1-B.col0-i);
int indexA = rowBlockA*A.original.numCols + (A.col0+i)*heightA + rowA*widthA;
int indexB = rowBlockB*B.original.numCols + (B.col0+i)*heightB + rowB*widthB;
if( i == startI ) {
indexA += offset;
indexB += offset;
for( int j = offset; j < segment; j++ ) {
total += dataB[indexB++]*dataA[indexA++];
}
} else {
for( int j = 0; j < segment; j++ ) {
total += dataB[indexB++]*dataA[indexA++];
}
}
}
return total;
}
/**
*
* vector dot/inner product from one row vector and one column vector:
* dot: c = sum ai*bi
* where 'a' is a row vector 'b' is a column vectors within the row block vector A and B, and 'c' is a scalar.
*
*
* @param A block row vector. Not modified.
* @param rowA which row in A the vector is contained in.
* @param B block column vector. Not modified.
* @param colB which column in B is the vector contained in.
* @param offset Index at which the vectors start at.
* @param end Index at which the vectors end at.
* @return Results of the dot product.
*/
public static float dot_row_col(final int blockLength,
FSubmatrixD1 A, int rowA,
FSubmatrixD1 B, int colB,
int offset, int end) {
// handle the case where offset is more than a block
int startI = offset - offset % blockLength;
offset = offset % blockLength;
final float dataA[] = A.original.data;
final float dataB[] = B.original.data;
float total = 0;
// handle rows in any block
int rowBlockA = A.row0 + rowA - rowA % blockLength;
rowA = rowA % blockLength;
int colBlockB = B.col0 + colB - colB % blockLength;
colB = colB % blockLength;
final int heightA = Math.min(blockLength,A.row1-rowBlockA);
final int widthB = Math.min(blockLength,B.col1-colBlockB);
if( A.col1 - A.col0 != B.col1 - B.col0 )
throw new RuntimeException();
for( int i = startI; i < end; i += blockLength ) {
int segment = Math.min(blockLength,end-i);
int widthA = Math.min(blockLength,A.col1-A.col0-i);
int heightB = Math.min(blockLength,B.row1-B.row0-i);
int indexA = rowBlockA*A.original.numCols + (A.col0+i)*heightA + rowA*widthA;
int indexB = (B.row0+i)*B.original.numCols + colBlockB*heightB + colB;
if( i == startI ) {
indexA += offset;
indexB += offset*widthB;
for( int j = offset; j < segment; j++ , indexB += widthB) {
total += dataB[indexB]*dataA[indexA++];
}
} else {
for( int j = 0; j < segment; j++ , indexB += widthB) {
total += dataB[indexB]*dataA[indexA++];
}
}
}
return total;
}
}