EDOBE XDOM PMML Manual de usuario descargar pdf (Pagina 71)

The "MaxAutoLevels" property determines the maximum number of

levels that will be automatically created. The actual number of levels

in a factor can be set larger than this, by explicitly setting the level

strings. The default value of this property is

10. A simple way to

disable auto-creation of factors is by setting this property to

The

"OverflowLevel" property is used when handling a new factor

level. If adding the new level would cause the number of levels to

exceed the

"MaxAutoLevels" property, the "OverflowLevel" string is

used instead. For example, if the levels are

"yes" and "no",

"MaxAutoLevels" is 2, and "OverflowLevel" is "yes", then all other

factor values will map to

"yes". If the overflow level is not one of the

existing levels, it is added, but it is done soon enough so that the total

number of levels will not exceed

"MaxAutoLevels". If the

"OverflowLevel" property is "", the default, then overflow levels are

mapped to

NA.

CNKBuf::

double mapLevelToDouble(int colNum,

const char* level_name);

const char* mapDoubleToLevel(int colNum, double val);

These methods handle mapping between double values and factor

level strings, for the specified

CNKBuf column, which may or may not

actually have the type

CNKBuf::column_type_factor.

mapLevelToDouble takes a string, and returns the double value used to

represent this factor level. If the string does not already appear in the

factor level list for this column, it may be added. This method uses

the

"MaxAutoLevels" and "OverflowLevel" properties of the column

to determine whether to create a new factor level.

mapDoubleToLevel takes a double, presumably retrieved from a factor

column, and returns the factor level string corresponding to that

value. If the double is a

NaN value, or if the value doesn't correspond

to any factor level, this returns

NULL.

CNKBuf::

int getEOF();

Each CNKBuf has a single EOF flag, can be set (via

CNKBufWriter::setEOF()) when a CNKProc has written all of the data

to the

CNKBuf that it ever will. Normally, a CNKProc reading from a

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