EDOBE XDOM PMML Instrukcja Użytkownika Pobierz pdf (Strona 69)

column_type_string,

column_type_timeDate};

void setColumnType(int colNum, int typeNum);

int getColumnType(int colNum);

int columnTypeIsDouble(int colNum);

int columnTypeIsFactor(int colNum);

int columnTypeIsString(long colNum);

int columnTypeIsTimeDate(long colNum);

Each column in a CNKBuf has a column type. The possible types are

identified by the integer values

CNKBuf::column_type_double,

CNKBuf::column_type_factor, CNKBuf::column_type_string, or

CNKBuf::column_type_timeDate. The type of a CNKBuf column can

be set/get with

setColumnType and getColumnType. The methods

columnTypeIsDouble, etc. return true (non-zero) if the specified

column is of type

column_type_double, etc.

If the column type is

CNKBuf::column_type_double, each value in the

column is interpreted as a floating point number. Missing values are

represented as the special

NaN value returned by

CNKObj::getDoubleNaN().

If the column type is

CNKBuf::column_type_factor, each value in the

column represents one of a list of string "factor levels", or the missing

value. The implementation is complicated. The actual values in the

CNKBuf are stored as double values (and NaN values). In order to

interpret these double values as factor levels, the

CNKBuf maintains

for each column a list of factor level strings. As new factor values are

stored, this list is grown. The actual double values stored in the

CNKBuf are the positions of the corresponding factor levels in the level

list (

0.0, 1.0, ...). Methods for accessing the factor levels for a column

are described below.

If the column type is

CNKBuf::column_type_string, each value is a

char array representing a string. Typically values are stored in the

UTF-8 format. As the pipeline itself does not manipulate the values

of the char arrays, it is possible to pass around strings using other char

array conventions.

If the column type is

CNKBuf::column_type_timeDate, each value is

stored as a long representing the number of milliseconds since an

origin of January 1, 1970. This is the same origin used by Java. The

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