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/*
* 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.ops;
import org.ejml.data.*;
import java.io.IOException;
import java.io.InputStream;
import java.util.List;
/**
* Reads in a matrix that is in a column-space-value (CSV) format.
*
* @author Peter Abeles
*/
public class ReadMatrixCsv extends ReadCsv {
/**
* Specifies where input comes from.
*
* @param in Where the input comes from.
*/
public ReadMatrixCsv(InputStream in) {
super(in);
}
/**
* Reads in a {@link Matrix} from the IO stream.
* @return Matrix
* @throws IOException If anything goes wrong.
*/
public M read32() throws IOException {
List words = extractWords();
if( words.size() == 3 ) {
int numRows = Integer.parseInt(words.get(0));
int numCols = Integer.parseInt(words.get(1));
boolean real = words.get(2).compareToIgnoreCase("real") == 0;
if (numRows < 0 || numCols < 0)
throw new IOException("Invalid number of rows and/or columns: " + numRows + " " + numCols);
if (real)
return (M) readFDRM(numRows, numCols);
else
return (M) readCDRM(numRows, numCols);
} else if ( words.size() == 4 ) {
int numRows = Integer.parseInt(words.get(0));
int numCols = Integer.parseInt(words.get(1));
int length = Integer.parseInt(words.get(2));
boolean real = words.get(3).compareToIgnoreCase("real") == 0;
if (numRows < 0 || numCols < 0)
throw new IOException("Invalid number of rows and/or columns: " + numRows + " " + numCols);
if (real)
return (M) readFSTR(numRows, numCols, length);
else
throw new IllegalArgumentException("Sparse complex not yet supported");
} else {
throw new IOException("Unexpected number of words on the first line. Found "+words.size());
}
}
/**
* Reads in a {@link Matrix} from the IO stream.
* @return Matrix
* @throws IOException If anything goes wrong.
*/
public M read64() throws IOException {
List words = extractWords();
if( words.size() == 3 ) {
int numRows = Integer.parseInt(words.get(0));
int numCols = Integer.parseInt(words.get(1));
boolean real = words.get(2).compareToIgnoreCase("real") == 0;
if (numRows < 0 || numCols < 0)
throw new IOException("Invalid number of rows and/or columns: " + numRows + " " + numCols);
if (real)
return (M) readDDRM(numRows, numCols);
else
return (M) readZDRM(numRows, numCols);
} else if ( words.size() == 4 ) {
int numRows = Integer.parseInt(words.get(0));
int numCols = Integer.parseInt(words.get(1));
int length = Integer.parseInt(words.get(2));
boolean real = words.get(3).compareToIgnoreCase("real") == 0;
if (numRows < 0 || numCols < 0)
throw new IOException("Invalid number of rows and/or columns: " + numRows + " " + numCols);
if (real)
return (M) readDSTR(numRows, numCols, length);
else
throw new IllegalArgumentException("Sparse complex not yet supported");
} else {
throw new IOException("Unexpected number of words on the first line. Found "+words.size());
}
}
/**
* Reads in a {@link DMatrixRMaj} from the IO stream where the user specifies the matrix dimensions.
*
* @param numRows Number of rows in the matrix
* @param numCols Number of columns in the matrix
* @return DMatrixRMaj
* @throws IOException
*/
public DMatrixRMaj readDDRM(int numRows, int numCols) throws IOException {
DMatrixRMaj A = new DMatrixRMaj(numRows,numCols);
for( int i = 0; i < numRows; i++ ) {
List words = extractWords();
if( words == null )
throw new IOException("Too few rows found. expected "+numRows+" actual "+i);
if( words.size() != numCols )
throw new IOException("Unexpected number of words in column. Found "+words.size()+" expected "+numCols);
for( int j = 0; j < numCols; j++ ) {
A.set(i,j,Double.parseDouble(words.get(j)));
}
}
return A;
}
/**
* Reads in a {@link FMatrixRMaj} from the IO stream where the user specifies the matrix dimensions.
*
* @param numRows Number of rows in the matrix
* @param numCols Number of columns in the matrix
* @return FMatrixRMaj
* @throws IOException
*/
public FMatrixRMaj readFDRM(int numRows, int numCols) throws IOException {
FMatrixRMaj A = new FMatrixRMaj(numRows,numCols);
for( int i = 0; i < numRows; i++ ) {
List words = extractWords();
if( words == null )
throw new IOException("Too few rows found. expected "+numRows+" actual "+i);
if( words.size() != numCols )
throw new IOException("Unexpected number of words in column. Found "+words.size()+" expected "+numCols);
for( int j = 0; j < numCols; j++ ) {
A.set(i,j,Float.parseFloat(words.get(j)));
}
}
return A;
}
/**
* Reads in a {@link ZMatrixRMaj} from the IO stream where the user specifies the matrix dimensions.
*
* @param numRows Number of rows in the matrix
* @param numCols Number of columns in the matrix
* @return ZMatrixRMaj
* @throws IOException
*/
public ZMatrixRMaj readZDRM(int numRows, int numCols) throws IOException {
ZMatrixRMaj A = new ZMatrixRMaj(numRows,numCols);
int wordsCol = numCols*2;
for( int i = 0; i < numRows; i++ ) {
List words = extractWords();
if( words == null )
throw new IOException("Too few rows found. expected "+numRows+" actual "+i);
if( words.size() != wordsCol )
throw new IOException("Unexpected number of words in column. Found "+words.size()+" expected "+wordsCol);
for( int j = 0; j < wordsCol; j += 2 ) {
double real = Double.parseDouble(words.get(j));
double imaginary = Double.parseDouble(words.get(j+1));
A.set(i, j, real, imaginary);
}
}
return A;
}
/**
* Reads in a {@link CMatrixRMaj} from the IO stream where the user specifies the matrix dimensions.
*
* @param numRows Number of rows in the matrix
* @param numCols Number of columns in the matrix
* @return CMatrixRMaj
* @throws IOException
*/
public CMatrixRMaj readCDRM(int numRows, int numCols) throws IOException {
CMatrixRMaj A = new CMatrixRMaj(numRows,numCols);
int wordsCol = numCols*2;
for( int i = 0; i < numRows; i++ ) {
List words = extractWords();
if( words == null )
throw new IOException("Too few rows found. expected "+numRows+" actual "+i);
if( words.size() != wordsCol )
throw new IOException("Unexpected number of words in column. Found "+words.size()+" expected "+wordsCol);
for( int j = 0; j < wordsCol; j += 2 ) {
float real = Float.parseFloat(words.get(j));
float imaginary = Float.parseFloat(words.get(j+1));
A.set(i, j, real, imaginary);
}
}
return A;
}
private FMatrixSparseTriplet readFSTR(int numRows, int numCols, int length) throws IOException {
List words;
FMatrixSparseTriplet m = new FMatrixSparseTriplet(numRows,numCols,length);
for (int i = 0; i < length; i++) {
words = extractWords();
if( words.size() != 3 )
throw new IllegalArgumentException("Unexpected number of words on line "+getLineNumber());
int row = Integer.parseInt(words.get(0));
int col = Integer.parseInt(words.get(1));
float value = Float.parseFloat(words.get(2));
m.addItem(row,col,value);
}
return m;
}
private DMatrixSparseTriplet readDSTR(int numRows, int numCols, int length) throws IOException {
List words;
DMatrixSparseTriplet m = new DMatrixSparseTriplet(numRows,numCols,length);
for (int i = 0; i < length; i++) {
words = extractWords();
if( words.size() != 3 )
throw new IllegalArgumentException("Unexpected number of words on line "+getLineNumber());
int row = Integer.parseInt(words.get(0));
int col = Integer.parseInt(words.get(1));
double value = Double.parseDouble(words.get(2));
m.addItem(row,col,value);
}
return m;
}
}
