Example: Math
Topic: Transformations
Code
<?php
declare(strict_types=1);
use function Flow\ETL\DSL\{data_frame, from_rows, int_entry, ref, row, rows, to_stream};
require __DIR__ . '/../../../autoload.php';
data_frame()
->read(from_rows(rows(
row(int_entry('a', 100), int_entry('b', 200))
)))
->withEntry('d', ref('b')->minus(ref('a')))
->write(to_stream(__DIR__ . '/output.txt', truncate: false))
->run();
Output
+-----+-----+-----+
| a | b | d |
+-----+-----+-----+
| 100 | 200 | 100 |
+-----+-----+-----+
1 rows
Examples
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