EDOBE XDOM PMML Manual do Utilizador descarregar pdf (Página 90)

Releasing rows and performing these other tasks can often by done

by calling

CNKProc::executeReleaseRows(long rows), passing the

number of rows to release. This utility method calls

releaseRows(rows) on all inputs and outputs, releasing the specified

number of rows, and calls

incrementRowsDone(rows). If any of the

inputs have been totally consumed

(inbuf->getEOF() && inbuf->getRowsReady()==0)

then it is assumed that the CNKProc is done: the setEOF() method is

called on all of the outputs, and

setDone(true) is called on the

CNKProc. If none of the inputs have been totally consumed,

setRequestRows(getNumRows()) is called on all of the inputs, and

setRequestRows(getOutputNumRows()) on all of the outputs, to

prepare for the next chunk.

The isReady() Method

Most of the time, it is not necessary to redefine

isReady(). The

default implementation of

CNKProc::isReady() returns true (non-

zero) if the

CNKProc is not done (according to isDone()), and it does

not have an error (according to

getError()), and all of its inputs and

outputs have their row requests satisfied (according to

CNKBufReader::isReady() and CNKBufWriter::isReady()).

It might be useful to redefine

isReady() for CNKProc objects that want

to handle their inputs and outputs differently, such as running when

only one of the inputs or outputs is ready, rather than all of them. For

example, this could be used in a merge operation that handles

multiple inputs.

CNKProcCount:

Counts and

Summaries

This proc has a single input buf, and no outputs. It performs several

different types of counting operations on the input data:

1. For all input columns, it accumulates the counts of the

number of NA and non-NA values, the minimum and

maximum non-NA values that have appeared in the column,

and some additional numeric summaries.

2. For factor input columns, it maintains counts of the number of

times each factor level appears.

3. Optionally, a set of factor columns can be selected, and

crosstabs will be calculated for them, counting the number of

times each combination of factor levels appears.

1 2 ... 85 86 87 88 89 90 91 92 93 94 95 96 97 98

Comentários a estes Manuais

Sem comentários

EDOBE XDOM PMML Manual do Utilizador Página 90

Comentários a estes Manuais