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https://issues.apache.org/jira/browse/MAHOUT-65?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12720871#action_12720871
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Jeff Eastman commented on MAHOUT-65:
------------------------------------
I implemented a little test using a TestVector that inherits from
AbstractVector and has Sean's new SparseVector instvars. It also implements
Serializable. The results are a bit surprising:
{noformat}
public void testThree() {
int[] indexes = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
double[] values = { 1.111, 2.222, 3.333, 4.444, 5.555, 6.666, 7.777, 8.888,
9.999 };
Vector obj = new TestVector(indexes, values);
Type vectorType = new TypeToken<Vector>() {
}.getType();
GsonBuilder builder = new GsonBuilder();
builder.registerTypeAdapter(vectorType, new JsonVectorAdapter());
Gson gson = builder.create();
String json = gson.toJson(obj, vectorType);
System.out.println("3 " + json.length() + " = " + json);
}
public void testFour() throws IOException {
int[] indexes = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
double[] values = { 1.111, 2.222, 3.333, 4.444, 5.555, 6.666, 7.777, 8.888,
9.999 };
TestVector obj = new TestVector(indexes, values);
OutputStream stm = new ByteArrayOutputStream();
ObjectOutputStream out = new ObjectOutputStream(stm);
out.writeObject(obj);
String json = stm.toString();
System.out.println("4 " + json.length() + " = " + json);
}
{noformat}
It produced the following results:
{noformat}
3 159 =
{"class":"org.apache.mahout.matrix.TestVector","vector":"{\"indexes\":[1,2,3,4,5,6,7,8,9],\"values\":[1.111,2.222,3.333,4.444,5.555,6.666,7.777,8.888,9.999]}"}
4 239 = ¨Ì
> Add Element Labels to Vectors and Matrices
> ------------------------------------------
>
> Key: MAHOUT-65
> URL: https://issues.apache.org/jira/browse/MAHOUT-65
> Project: Mahout
> Issue Type: New Feature
> Components: Matrix
> Affects Versions: 0.1
> Reporter: Jeff Eastman
> Assignee: Jeff Eastman
> Attachments: MAHOUT-65-name.patch, MAHOUT-65-name.patch,
> MAHOUT-65-name.patch, MAHOUT-65.patch, MAHOUT-65b.patch, MAHOUT-65c.patch,
> MAHOUT-65d.patch
>
>
> Many applications can benefit by accessing elements in vectors and matrices
> using String labels in addition to numeric indices. Investigate adding such a
> capability.
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