t201 opened a new pull request #951:
URL: https://github.com/apache/systemml/pull/951
Closes #941.
## `set intersection for numeric data`-Function
The `set intersection for numeric data`-function implements the intersection
of two matrices by taking into input known as sets.
The function returns an intersection matrix which is knows as the set of
the resultant set of the two intersecting matrices.
### Usage
```r
m_intersect = function(Matrix[Double] X, Matrix[Double] Y)
```
### Arguments
| Name | Type | Default | Description |
| :------ | :------------- | -------- | :---------- |
| X | Matrix[Double] | -- | matrix X, set A |
| Y | Matrix[Double] | -- | matrix Y, set B |
### Returns
| Type | Description |
| :------------- | :---------- |
| Matrix[Double] | intersection matrix, set of intersecting items|
### Example
```
m_intersect = function(Matrix[Double] X, Matrix[Double] Y)
return(Matrix[Double] R)
{
# compute indicator vector of intersection output
X = (table(X, 1) != 0)
Y = (table(Y, 1) != 0)
n = min(nrow(X), nrow(Y))
I = X[1:n,] * Y[1:n,]
# reconstruct integer values and create output
R = removeEmpty(target=seq(1,n), margin="rows", select=I)
}
```
P.S. The content of the document doesn't show up when i click on the
function name in table of contents.
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