cern.colt.matrix.tint.algo
Class IntFormatter

java.lang.Object
  cern.colt.PersistentObject
      cern.colt.matrix.AbstractFormatter
          cern.colt.matrix.tint.algo.IntFormatter

All Implemented Interfaces:

Serializable, Cloneable

public class IntFormatter
extends AbstractFormatter

Flexible, well human readable matrix print formatting; By default decimal point aligned. 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.

Examples:

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

Original matrix

int[][] 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 DenseIntMatrix2D(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.

int[][] 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";
IntMatrix2D matrix = new DenseIntMatrix2D(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, Int 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.AbstractFormatter

CENTER, DECIMAL, DEFAULT_COLUMN_SEPARATOR, DEFAULT_MIN_COLUMN_WIDTH, DEFAULT_ROW_SEPARATOR, DEFAULT_SLICE_SEPARATOR, LEFT, RIGHT

Constructor Summary

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

IntFormatter(String format)
Constructs and returns a matrix formatter.

Method Summary

String[][]	format(IntMatrix2D matrix) Returns a string representations of all cells; no alignment considered.
String	toSourceCode(IntMatrix1D matrix) Returns a string s such that Object[] m = s is a legal Java statement.
String	toSourceCode(IntMatrix2D matrix) Returns a string s such that Object[] m = s is a legal Java statement.
String	toSourceCode(IntMatrix3D matrix) Returns a string s such that Object[] m = s is a legal Java statement.
String	toString(IntMatrix1D matrix) Returns a string representation of the given matrix.
String	toString(IntMatrix2D matrix) Returns a string representation of the given matrix.
String	toString(IntMatrix3D matrix) Returns a string representation of the given matrix.

Methods inherited from class cern.colt.matrix.AbstractFormatter

setAlignment, setColumnSeparator, setFormat, setMinColumnWidth, setPrintShape, setRowSeparator, setSliceSeparator, shape, shape, shape

Methods inherited from class cern.colt.PersistentObject

clone

Methods inherited from class java.lang.Object

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

Constructor Detail

IntFormatter

public IntFormatter()

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

IntFormatter

public IntFormatter(String format)

Constructs and returns a matrix formatter.

Parameters:

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

Method Detail

format

public String[][] format(IntMatrix2D matrix)

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

toSourceCode

public String toSourceCode(IntMatrix1D 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(IntMatrix2D 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(IntMatrix3D 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(IntMatrix1D matrix)

Returns a string representation of the given matrix.

Parameters:

matrix - the matrix to convert.

toString

public String toString(IntMatrix2D matrix)

Returns a string representation of the given matrix.

Parameters:

matrix - the matrix to convert.

toString

public String toString(IntMatrix3D matrix)

Returns a string representation of the given matrix.

Parameters:

matrix - the matrix to convert.