FloatFormatter
cern.colt.matrix.tfloat.algo

Class FloatFormatter

  • All Implemented Interfaces:
    Serializable, Cloneable


    public class FloatFormatterextends 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

    float[][] 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 DenseFloatMatrix2D(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.

    float[][] 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";
    FloatMatrix2D matrix = new DenseFloatMatrix2D(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, Float.toString(float) 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.

    See Also:
    Serialized Form
    • Constructor Detail

      • FloatFormatter

        public FloatFormatter()
        Constructs and returns a matrix formatter with format "%G".
      • FloatFormatter

        public FloatFormatter(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,         float 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.
      • format

        public String[][] format(FloatMatrix2D matrix)
        Returns a string representations of all cells; no alignment considered.
      • toSourceCode

        public String toSourceCode(FloatMatrix1D 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(FloatMatrix2D 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(FloatMatrix3D 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(FloatMatrix1D matrix)
        Returns a string representation of the given matrix.
        Parameters:
        matrix - the matrix to convert.
      • toString

        public String toString(FloatMatrix2D matrix)
        Returns a string representation of the given matrix.
        Parameters:
        matrix - the matrix to convert.
      • toString

        public String toString(FloatMatrix3D matrix)
        Returns a string representation of the given matrix.
        Parameters:
        matrix - the matrix to convert.
      • toTitleString

        public String toTitleString(FloatMatrix2D matrix,                   String[] rowNames,                   String[] columnNames,                   String rowAxisName,                   String columnAxisName,                   String title,                   FloatBinFunction1D[] aggr)
        Same as toTitleString except that additionally statistical aggregates (mean, median, sum, etc.) of rows and columns are printed. 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.
        aggr - the aggregation functions to be applied to columns and rows.
        Returns:
        the matrix converted to a string.
        See Also:
        FloatBinFunction1D, FloatBinFunctions1D
      • toTitleString

        public String toTitleString(FloatMatrix3D matrix,                   String[] sliceNames,                   String[] rowNames,                   String[] columnNames,                   String sliceAxisName,                   String rowAxisName,                   String columnAxisName,                   String title,                   FloatBinFunction1D[] aggr)
        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.
        sliceNames - The headers of all slices (to be put above each slice).
        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).
        sliceAxisName - The label of the z-axis (to be put above each slice).
        rowAxisName - The label of the y-axis.
        columnAxisName - The label of the x-axis.
        title - The overall title of the matrix to be formatted.
        aggr - the aggregation functions to be applied to columns, rows.
        Returns:
        the matrix converted to a string.
        See Also:
        FloatBinFunction1D, FloatBinFunctions1D

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