Example usage for org.apache.mahout.math Vector viewPart

Introduction

In this page you can find the example usage for org.apache.mahout.math Vector viewPart.

Prototype

Vector viewPart(int offset, int length);

Source Link

Document

Return a new vector containing the subset of the recipient

Usage

From source file:org.qcri.pca.MeanAndSpanJobTest.java

License:Apache License

private void verifyMapperOutput(DummyRecordWriter<IntWritable, VectorWritable> writer) {
    Assert.assertEquals("Each mapper should output three keys!", 3, writer.getKeys().size());
    for (IntWritable key : writer.getKeys()) {
        List<VectorWritable> list = writer.getValue(key);
        assertEquals("Mapper did not combine the results!", 1, list.size());
        Vector v = list.get(0).get();
        switch (key.get()) {
        case MeanAndSpanJob.MEANVECTOR:
            Assert.assertEquals("MeanVector size does not match!", v.size(), cols + 1);
            Assert.assertEquals("MeanVector count does not match!", rows, v.get(0), EPSILON);
            verifySum(inputVectors, v.viewPart(1, cols));
            break;
        case MeanAndSpanJob.MINVECTOR:
            Assert.assertEquals("MinVector size does not match!", v.size(), cols);
            verifyMin(inputVectors, v);/*from  ww w . ja  va2 s .  c om*/
            break;
        case MeanAndSpanJob.MAXVECTOR:
            Assert.assertEquals("MaxVector size does not match!", v.size(), cols);
            verifyMax(inputVectors, v);
            break;
        default:
            Assert.fail("Unknown key from mapper");
        }
    }
}

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