php-ml/docs/machine-learning/datasets/array-dataset.md
Arkadiusz Kondas 8976047cbc
Add removeColumns function to ArrayDataset (#249)
* Add removeColumns function to ArrayDataset

* Add removeColumns to docs

* Fix cs
2018-03-03 16:04:21 +01:00

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# ArrayDataset
Helper class that holds data as PHP `array` type. Implements the `Dataset` interface which is used heavily in other classes.
### Constructors Parameters
* $samples - (array) of samples
* $labels - (array) of labels
```
use Phpml\Dataset\ArrayDataset;
$dataset = new ArrayDataset([[1, 1], [2, 1], [3, 2], [4, 1]], ['a', 'a', 'b', 'b']);
```
### Samples and labels
To get samples or labels you can use getters:
```
$dataset->getSamples();
$dataset->getTargets();
```
### Remove columns
You can remove columns by index numbers, for example:
```
use Phpml\Dataset\ArrayDataset;
$dataset = new ArrayDataset(
[[1,2,3,4], [2,3,4,5], [3,4,5,6], [4,5,6,7]],
['a', 'a', 'b', 'b']
);
$dataset->removeColumns([0,2]);
// now from each sample column 0 and 2 are removed
// [[2,4], [3,5], [4,6], [5,7]]
```