EDOBE XDOM PMML Manual de usuario descargar pdf (Pagina 70)

integer part of this number is the number of days, and the fractional

part represents a fraction of a day, e.g. the hours, minutes, and

seconds.

CNKBuf::

void setNumLevels(int colNum, int i);

int getNumLevels(int colNum);

void setLevelName(int colNum, int i,

const char* level_name);

const char* getLevelName(int colNum, int i);

void setMaxAutoLevels(int colNum, int val);

int getMaxAutoLevels(int colNum);

void setOverflowLevel(int colNum, const char* val);

const char* getOverflowLevel(int colNum);

These methods access the factor level list associated with each CNKBuf

column. Note that this list is associated with every column, even if it

does not have type

CNKBuf::column_type_factor.

At any time, each column has a certain number of factor levels. The

size of this list can be accessed with

setNumLevels and getNumLevels,

and individual level names can be accessed with

setLevelName and

getLevelName. Normally, there is no need to call setNumLevels

explicitly: If

setLevelName is called to set a level name beyond the

end of the list, it is automatically extended.

The

set/getMaxAutoLevels and set/getOverflowLevel methods

access additional properties associated with each column that control

how new factor levels are created. If you know all of the possible

factor levels that can be read ahead of time, you can simply set up a

factor column with these levels. However, if you don't know all of the

possible factor levels, there is a potential problem. The pipeline is

designed to be used for problems with very large amounts of data. If

every new factor level that appears is simply added to the level list,

then it is possible that the system would allocate more and more

different level strings, until you run out of memory. Even if the

number of possible levels is relatively small, there are situations

where it is useful to restrict it even further: some operations such as

tree modeling and crosstabs can take massive amounts of time or

space for variables with many factor levels.

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EDOBE XDOM PMML Manual de usuario Pagina 70