cern.colt.matrix.doublealgo

Class Formatter

java.lang.Object

cern.colt.PersistentObject

cern.colt.matrix.impl.AbstractFormatter

cern.colt.matrix.doublealgo.Formatter

All Implemented Interfaces:

Serializable, Cloneable

public class Formatter
extends AbstractFormatter

Flexible, well human readable matrix print formatting; By default decimal point aligned. Build on top of the C-like sprintf functionality provided by the Format class written by Cay Horstmann. Currenly works on 1-d, 2-d and 3-d matrices. Note that in most cases you will not need to get familiar with this class; just call matrix.toString() and be happy with the default formatting. This class is for advanced requirements.

Can't exactly remember the syntax of printf format strings? See Format or Henrik Nordberg's documentation, or the Dinkumware's C Library Reference.

Examples:

Examples demonstrate usage on 2-d matrices. 1-d and 3-d matrices formatting works very similar.

Original matrix

double[][] values = { {3, 0, -3.4, 0}, {5.1 ,0, +3.0123456789, 0}, {16.37, 0.0, 2.5, 0}, {-16.3, 0, -3.012345678E-4, -1}, {1236.3456789, 0, 7, -1.2} }; matrix = new DenseDoubleMatrix2D(values);

format	Formatter.toString(matrix);	Formatter.toSourceCode(matrix);
%G (default)	5 x 4 matrix 3 0 -3.4 0 5.1 0 3.012346 0 16.37 0 2.5 0 -16.3 0 -0.000301 -1 1236.345679 0 7 -1.2	{ { 3 , 0, -3.4 , 0 }, { 5.1 , 0, 3.012346, 0 }, { 16.37 , 0, 2.5 , 0 }, { -16.3 , 0, -0.000301, -1 }, {1236.345679, 0, 7 , -1.2} };
%1.10G	5 x 4 matrix 3 0 -3.4 0 5.1 0 3.0123456789 0 16.37 0 2.5 0 -16.3 0 -0.0003012346 -1 1236.3456789 0 7 -1.2	{ { 3 , 0, -3.4 , 0 }, { 5.1 , 0, 3.0123456789, 0 }, { 16.37 , 0, 2.5 , 0 }, { -16.3 , 0, -0.0003012346, -1 }, {1236.3456789, 0, 7 , -1.2} };
%f	5 x 4 matrix 3.000000 0.000000 -3.400000 0.000000 5.100000 0.000000 3.012346 0.000000 16.370000 0.000000 2.500000 0.000000 -16.300000 0.000000 -0.000301 -1.000000 1236.345679 0.000000 7.000000 -1.200000	{ { 3.000000, 0.000000, -3.400000, 0.000000}, { 5.100000, 0.000000, 3.012346, 0.000000}, { 16.370000, 0.000000, 2.500000, 0.000000}, { -16.300000, 0.000000, -0.000301, -1.000000}, {1236.345679, 0.000000, 7.000000, -1.200000} };
%1.2f	5 x 4 matrix 3.00 0.00 -3.40 0.00 5.10 0.00 3.01 0.00 16.37 0.00 2.50 0.00 -16.30 0.00 -0.00 -1.00 1236.35 0.00 7.00 -1.20	{ { 3.00, 0.00, -3.40, 0.00}, { 5.10, 0.00, 3.01, 0.00}, { 16.37, 0.00, 2.50, 0.00}, { -16.30, 0.00, -0.00, -1.00}, {1236.35, 0.00, 7.00, -1.20} };
%0.2e	5 x 4 matrix 3.00e+000 0.00e+000 -3.40e+000 0.00e+000 5.10e+000 0.00e+000 3.01e+000 0.00e+000 1.64e+001 0.00e+000 2.50e+000 0.00e+000 -1.63e+001 0.00e+000 -3.01e-004 -1.00e+000 1.24e+003 0.00e+000 7.00e+000 -1.20e+000	{ { 3.00e+000, 0.00e+000, -3.40e+000, 0.00e+000}, { 5.10e+000, 0.00e+000, 3.01e+000, 0.00e+000}, { 1.64e+001, 0.00e+000, 2.50e+000, 0.00e+000}, {-1.63e+001, 0.00e+000, -3.01e-004, -1.00e+000}, { 1.24e+003, 0.00e+000, 7.00e+000, -1.20e+000} };
null	5 x 4 matrix 3.0 0.0 -3.4 0.0 5.1 0.0 3.0123456789 0.0 16.37 0.0 2.5 0.0 -16.3 0.0 -3.012345678E-4 -1.0 1236.3456789 0.0 7.0 -1.2	{ { 3.0 , 0.0, -3.4 , 0.0}, { 5.1 , 0.0, 3.0123456789 , 0.0}, { 16.37 , 0.0, 2.5 , 0.0}, { -16.3 , 0.0, -3.012345678E-4, -1.0}, {1236.3456789, 0.0, 7.0 , -1.2} };

Here are some more elaborate examples, adding labels for axes, rows, columns, title and some statistical aggregations.

double[][] values = { {5 ,10, 20, 40 }, { 7, 8 , 6 , 7 }, {12 ,10, 20, 19 }, { 3, 1 , 5 , 6 } }; String title = "CPU performance over time [nops/sec]"; String columnAxisName = "Year"; String rowAxisName = "CPU"; String[] columnNames = {"1996", "1997", "1998", "1999"}; String[] rowNames = { "PowerBar", "Benzol", "Mercedes", "Sparcling"}; hep.aida.bin.BinFunctions1D F = hep.aida.bin.BinFunctions1D.functions; // alias hep.aida.bin.BinFunction1D[] aggr = {F.mean, F.rms, F.quantile(0.25), F.median, F.quantile(0.75), F.stdDev, F.min, F.max}; String format = "%1.2G"; DoubleMatrix2D matrix = new DenseDoubleMatrix2D(values); new Formatter(format).toTitleString( matrix,rowNames,columnNames,rowAxisName,columnAxisName,title,aggr);

CPU performance over time [nops/sec] | Year | 1996 1997 1998 1999 | Mean RMS 25% Q. Median 75% Q. StdDev Min Max --------------------------------------------------------------------------------------- C PowerBar | 5 10 20 40 | 18.75 23.05 8.75 15 25 15.48 5 40 P Benzol | 7 8 6 7 | 7 7.04 6.75 7 7.25 0.82 6 8 U Mercedes | 12 10 20 19 | 15.25 15.85 11.5 15.5 19.25 4.99 10 20 Sparcling | 3 1 5 6 | 3.75 4.21 2.5 4 5.25 2.22 1 6 --------------------------------------------------------------------------------------- Mean | 6.75 7.25 12.75 18 | RMS | 7.53 8.14 14.67 22.62 | 25% Q. | 4.5 6.25 5.75 6.75 | Median | 6 9 13 13 | 75% Q. | 8.25 10 20 24.25 | StdDev | 3.86 4.27 8.38 15.81 | Min | 3 1 5 6 | Max | 12 10 20 19 |

same as above, but now without aggregations aggr=null;

CPU performance over time [nops/sec] | Year | 1996 1997 1998 1999 --------------------------------- C PowerBar | 5 10 20 40 P Benzol | 7 8 6 7 U Mercedes | 12 10 20 19 Sparcling | 3 1 5 6

same as above, but now without rows labeled aggr=null; rowNames=null; rowAxisName=null;

CPU performance over time [nops/sec] Year 1996 1997 1998 1999 ------------------- 5 10 20 40 7 8 6 7 12 10 20 19 3 1 5 6

A column can be broader than specified by the parameter minColumnWidth (because a cell may not fit into that width) but a column is never smaller than minColumnWidth. Normally one does not need to specify minColumnWidth (default is 1). This parameter is only interesting when wanting to print two distinct matrices such that both matrices have the same column width, for example, to make it easier to see which column of matrix A corresponds to which column of matrix B.

Implementation:

Note that this class is by no means ment to be used for high performance I/O (serialization is much quicker). It is ment to produce well human readable output.

Analyzes the entire matrix before producing output. Each cell is converted to a String as indicated by the given C-like format string. If null is passed as format string, Double.toString(double) is used instead, yielding full precision.

Next, leading and trailing whitespaces are removed. For each column the maximum number of characters before and after the decimal point is determined. (No problem if decimal points are missing). Each cell is then padded with leading and trailing blanks, as necessary to achieve decimal point aligned, left justified formatting.

Version:

1.2, 11/30/99

Author:

wolfgang.hoschek@cern.ch

See Also:

Serialized Form

Field Summary

Fields inherited from class cern.colt.matrix.impl.AbstractFormatter

alignment, CENTER, columnSeparator, DECIMAL, DEFAULT_COLUMN_SEPARATOR, DEFAULT_MIN_COLUMN_WIDTH, DEFAULT_ROW_SEPARATOR, DEFAULT_SLICE_SEPARATOR, factory, format, LEFT, minColumnWidth, printShape, RIGHT, rowSeparator, sliceSeparator

Fields inherited from class cern.colt.PersistentObject

serialVersionUID

Constructor Summary

Constructors

Constructor and Description
Formatter() Constructs and returns a matrix formatter with format "%G".
Formatter(String format) Constructs and returns a matrix formatter.

Method Summary

Methods

Modifier and Type	Method and Description
static void	demo1() Demonstrates how to use this class.
static void	demo2() Demonstrates how to use this class.
static void	demo3(int size, double value) Demonstrates how to use this class.
static void	demo4() Demonstrates how to use this class.
static void	demo5() Demonstrates how to use this class.
static void	demo6() Demonstrates how to use this class.
static void	demo7() Demonstrates how to use this class.
protected String	form(AbstractMatrix1D matrix, int index, Former formatter) Converts a given cell to a String; no alignment considered.
protected String	form(DoubleMatrix1D matrix, int index, Former formatter) Converts a given cell to a String; no alignment considered.
protected String[][]	format(AbstractMatrix2D matrix) Returns a string representations of all cells; no alignment considered.
String[][]	format(DoubleMatrix2D matrix) Returns a string representations of all cells; no alignment considered.
protected int	indexOfDecimalPoint(String s) Returns the index of the decimal point.
protected int	lead(String s) Returns the number of characters before the decimal point.
String	toSourceCode(DoubleMatrix1D matrix) Returns a string s such that Object[] m = s is a legal Java statement.
String	toSourceCode(DoubleMatrix2D matrix) Returns a string s such that Object[] m = s is a legal Java statement.
String	toSourceCode(DoubleMatrix3D matrix) Returns a string s such that Object[] m = s is a legal Java statement.
protected String	toString(AbstractMatrix2D matrix) Returns a string representation of the given matrix.
String	toString(DoubleMatrix1D matrix) Returns a string representation of the given matrix.
String	toString(DoubleMatrix2D matrix) Returns a string representation of the given matrix.
String	toString(DoubleMatrix3D matrix) Returns a string representation of the given matrix.
protected String	toTitleString(DoubleMatrix2D matrix, String[] rowNames, String[] columnNames, String rowAxisName, String columnAxisName, String title) Returns a string representation of the given matrix with axis as well as rows and columns labeled.

Methods inherited from class cern.colt.matrix.impl.AbstractFormatter

align, alignmentCode, alignRow, blanks, demo3, formatRow, repeat, setAlignment, setColumnSeparator, setFormat, setMinColumnWidth, setPrintShape, setRowSeparator, setSliceSeparator, setupBlanksCache, shape, shape, shape, toString

Methods inherited from class cern.colt.PersistentObject

clone

Methods inherited from class java.lang.Object

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

Constructor Detail

Formatter

public Formatter()

Constructs and returns a matrix formatter with format "%G".

Formatter

public Formatter(String format)

Constructs and returns a matrix formatter.

Parameters:

format - the given format used to convert a single cell value.

Method Detail

demo1

public static void demo1()

Demonstrates how to use this class.

demo2

public static void demo2()

Demonstrates how to use this class.

demo3

public static void demo3(int size,
         double value)

Demonstrates how to use this class.

demo4

public static void demo4()

Demonstrates how to use this class.

demo5

public static void demo5()

Demonstrates how to use this class.

demo6

public static void demo6()

Demonstrates how to use this class.

demo7

public static void demo7()

Demonstrates how to use this class.

form

protected String form(DoubleMatrix1D matrix,
          int index,
          Former formatter)

Converts a given cell to a String; no alignment considered.

form

protected String form(AbstractMatrix1D matrix,
          int index,
          Former formatter)

Converts a given cell to a String; no alignment considered.

Specified by:

form in class AbstractFormatter

format

public String[][] format(DoubleMatrix2D matrix)

Returns a string representations of all cells; no alignment considered.

format

protected String[][] format(AbstractMatrix2D matrix)

Returns a string representations of all cells; no alignment considered.

Specified by:

format in class AbstractFormatter

indexOfDecimalPoint

protected int indexOfDecimalPoint(String s)

Returns the index of the decimal point.

lead

protected int lead(String s)

Returns the number of characters before the decimal point.

Overrides:

lead in class AbstractFormatter

toSourceCode

public String toSourceCode(DoubleMatrix1D matrix)

Returns a string s such that Object[] m = s is a legal Java statement.

Parameters:

matrix - the matrix to format.

toSourceCode

public String toSourceCode(DoubleMatrix2D matrix)

Returns a string s such that Object[] m = s is a legal Java statement.

Parameters:

matrix - the matrix to format.

toSourceCode

public String toSourceCode(DoubleMatrix3D matrix)

Returns a string s such that Object[] m = s is a legal Java statement.

Parameters:

matrix - the matrix to format.

toString

public String toString(DoubleMatrix1D matrix)

Returns a string representation of the given matrix.

Parameters:

matrix - the matrix to convert.

toString

public String toString(DoubleMatrix2D matrix)

Returns a string representation of the given matrix.

Parameters:

matrix - the matrix to convert.

toString

public String toString(DoubleMatrix3D matrix)

Returns a string representation of the given matrix.

Parameters:

matrix - the matrix to convert.

toString

protected String toString(AbstractMatrix2D matrix)

Returns a string representation of the given matrix.

Overrides:

toString in class AbstractFormatter

Parameters:

matrix - the matrix to convert.

toTitleString

protected String toTitleString(DoubleMatrix2D matrix,
                   String[] rowNames,
                   String[] columnNames,
                   String rowAxisName,
                   String columnAxisName,
                   String title)

Returns a string representation of the given matrix with axis as well as rows and columns labeled. Pass null to one or more parameters to indicate that the corresponding decoration element shall not appear in the string converted matrix.

Parameters:

matrix - The matrix to format.

rowNames - The headers of all rows (to be put to the left of the matrix).

columnNames - The headers of all columns (to be put to above the matrix).

rowAxisName - The label of the y-axis.

columnAxisName - The label of the x-axis.

title - The overall title of the matrix to be formatted.

Returns:

the matrix converted to a string.