What are common errors that may result in the JPGraph error "Cannot use auto scaling since it is impossible to find a valid min/max value of the Y-Axis"?

The error "Cannot use auto scaling since it is impossible to find a valid min/max value of the Y-Axis" in JPGraph typically occurs when the data being plotted does not have valid numerical values or when the data range is too small to determine a meaningful axis scale. To solve this issue, ensure that your data contains valid numerical values and has a reasonable range for the Y-axis.

// Ensure data contains valid numerical values and has a reasonable range for the Y-axis
$data = array(10, 20, 30, 40, 50); // Example data array

// Check if data is valid and has a reasonable range
if (min($data) === max($data)) {
    // Add a small buffer to the data range if necessary
    $minValue = min($data) - 10;
    $maxValue = max($data) + 10;
} else {
    $minValue = min($data);
    $maxValue = max($data);
}

// Create the graph with the adjusted Y-axis scale
$graph = new Graph(400, 300);
$graph->SetScale('textlin', $minValue, $maxValue);