Method writeHeader

JSAT/src/jsat/io/JSATData.java:373–422

(CategoricalData[] catInfo, int dim, DataWriter.DataSetType type, OutputStream out)

        return new DataWriter(out, catInfo, dim, type)
        {
            @Override
            protected void writeHeader(CategoricalData[] catInfo, int dim, DataWriter.DataSetType type, OutputStream out) throws IOException
            {
                DataOutputStream data_out = new DataOutputStream(out);
        
                data_out.write(JSATData.MAGIC_NUMBER);

                int numNumeric = dim;
                int numCat = catInfo.length;

                DatasetTypeMarker marker = DatasetTypeMarker.STANDARD;
                if(type == type.REGRESSION)
                {
                    numNumeric++;
                    marker = DatasetTypeMarker.REGRESSION;
                }
                if(type == type.CLASSIFICATION)
                {
                    numCat++;
                    marker = DatasetTypeMarker.CLASSIFICATION;
                }

                data_out.writeByte(marker.ordinal());
                data_out.writeByte(fpStore.ordinal());
                data_out.writeInt(numNumeric);
                data_out.writeInt(numCat);
                data_out.writeInt(-1);//-1 used to indicate a potentially variable number of files

                for(CategoricalData category : catInfo)
                {
                    //first, whats the name of the i'th category
                    writeString(category.getCategoryName(), data_out);

                    data_out.writeInt(category.getNumOfCategories());//output the number of categories 
                    for(int i = 0; i < category.getNumOfCategories(); i++)//the option names
                        writeString(category.getOptionName(i), data_out);
                }
                //extra for classification dataset
                if(type == DataWriter.DataSetType.CLASSIFICATION)
                {
                    CategoricalData category = predicting;
                    //first, whats the name of the i'th category
                    writeString(category.getCategoryName(), data_out);

                    data_out.writeInt(category.getNumOfCategories());//output the number of categories 
                    for(int i = 0; i < category.getNumOfCategories(); i++)//the option names
                        writeString(category.getOptionName(i), data_out);
                }
                data_out.flush();
            }
            
            @Override
            protected void pointToBytes(DataPoint dp, double label, ByteArrayOutputStream byteOut)