What is the purpose of creating a second identical Y-axis in a PHP graph?

Creating a second identical Y-axis in a PHP graph can be useful for displaying data with different units or scales on the same graph. This allows for easy comparison between the two datasets without the need for separate graphs. 

// Create a PHP graph with a second identical Y-axis
$graph = new Graph(800, 600);
$graph->SetScale("lin");

// Create the first dataset
$data = array(1, 2, 3, 4, 5);
$lineplot = new LinePlot($data);
$graph->Add($lineplot);

// Create the second dataset
$data2 = array(10, 20, 30, 40, 50);
$lineplot2 = new LinePlot($data2);
$graph->AddY2($lineplot2);

$graph->Stroke();

Keywords

PHP graph Y-axis identical purpose

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