com.jmatio.io

Class MatFileIncrementalWriter

java.lang.Object

com.jmatio.io.MatFileIncrementalWriter

public class MatFileIncrementalWriter
extends java.lang.Object

MAT-file Incremental writer. An updated writer which allows adding variables incrementally for the life of the writer. This is necessary to allow large variables to be written without having to hold onto then longer than is necessary. The writer internally maintains a list of the variable names it has written so far, and will throw an exception if the same variable name is submitted more than once to the same reader. Usage:

 //1. First create example arrays
 double[] src = new double[] { 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 };
 MLDouble mlDouble = new MLDouble( "double_arr", src, 3 );
 MLChar mlChar = new MLChar( "char_arr", "I am dummy" );
         
 //2. write arrays to file
 MatFileIncrementalWriter writer = new MatFileIncrementalWriter( new File("mat_file.mat"));
 writer.write(mlDouble);
 writer.write(mlChar);
 
 writer.close();
 
 

this is "equal" to Matlab commands:

 >> double_arr = [ 1 2; 3 4; 5 6];
 >> char_arr = 'I am dummy';
 >>
 >> save('mat_file.mat', 'double_arr');
 >> save('mat_file.mat', 'char_arr', '-append');
 

Constructor Summary

Constructors

Constructor and Description
MatFileIncrementalWriter(java.io.File file) Creats a writer to a file given the File object.
MatFileIncrementalWriter(java.lang.String fileName) Creates a writer to a file given the filename.
MatFileIncrementalWriter(java.nio.channels.WritableByteChannel chan) Creates a writer for a file, given an output channel to the file..

Method Summary

Modifier and Type	Method and Description
void	close()
void	write(java.util.Collection<MLArray> data) Writes MLArrays into WritableByteChannel.
void	write(MLArray data)

Methods inherited from class java.lang.Object

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

Constructor Detail

MatFileIncrementalWriter

public MatFileIncrementalWriter(java.lang.String fileName)
                         throws java.io.IOException

Creates a writer to a file given the filename.

Parameters:

fileName - - name of ouput file

Throws:

java.io.IOException

java.util.zip.DataFormatException

MatFileIncrementalWriter

public MatFileIncrementalWriter(java.io.File file)
                         throws java.io.IOException

Creats a writer to a file given the File object.

Parameters:

file - - an output File

Throws:

java.io.IOException

java.util.zip.DataFormatException

MatFileIncrementalWriter

public MatFileIncrementalWriter(java.nio.channels.WritableByteChannel chan)
                         throws java.io.IOException

Creates a writer for a file, given an output channel to the file.. Writes MAT-file header and compressed data (miCOMPRESSED).

Parameters:

chan - - WritableByteChannel

data - - Collection of MLArray elements

Throws:

java.io.IOException

Method Detail

write

public void write(MLArray data)
           throws java.io.IOException

Throws:

java.io.IOException

write

public void write(java.util.Collection<MLArray> data)
           throws java.io.IOException

Writes MLArrays into WritableByteChannel.

Parameters:

channel - the channel to write to

data - the collection of MLArray objects

Throws:

java.io.IOException - if writing fails

close

public void close()
           throws java.io.IOException

Throws:

java.io.IOException