我对化简器的输入值是一个双精度数组。
719.000 501.000 -75.000
501.000 508.000 -62.000
-75.000 -62.000 10.000
在我的减速器中,我需要打印这个 matrix.so 我做了
public void reduce(IntWritable key,
Iterable<DoubleArrayWritable> values, Context context)
throws IOException, InterruptedException {
System.out.println("in reducer");
for (DoubleArrayWritable c :values) { // TODO - test me
System.out.println("C ="+c.toString());
}
}
其中 DoubleArrayWwrite 是
public static class DoubleArrayWritable extends TwoDArrayWritable {
public DoubleArrayWritable() {
super(DoubleWritable.class);
}
}
我的输出是C =edu.Driver$DoubleArrayWritable@32d16fe3
但是我需要以人类可读的格式打印整个矩阵。
您需要
覆盖DoubleArrayWritable
的toString()
:
@Override
public String toString()
{
// return the string you want
}