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    <p>First of all you need to define your y points, for this we need a range. As you are creating your array I would have two variables, <code>$minYear</code> and <code>$maxYear</code>, then for every entry into the array you check if it's smaller than minYear, or bigger than maxYear, and if so replace the value with this one.</p> <p>That gives us our min and max, now we need a range. You need to determine how many points between each year you have. To keep things simple I'm going to assume 1 year is one increment on the y axis. However if you have a maximum number of points on the y axis you can use, then you can use the following formulae to work out how many years are between each point:</p> <pre><code>$increment = ($maxYear - $minYear) / $numPointsOnYAxis; </code></pre> <p>That will give you how many years are between each point on the Y Axis. For simplicity you may wish to round that number using the <code>ceil()</code> function. It means you won't use every point on the Y axis, but it keeps the maths nice and easy.</p> <p>Now we have our range you can use foreach loops to go through your data and plot the graph.</p> <pre><code>$space = ''; foreach($array as $num =&gt; $a) { echo $space . '[x' . $num; foreach($a as $year =&gt; $value) { $y = ceil(($value - $minValue) / $increment); //Work out how many increments up the scale the year needs to be. echo ', y' . $y; } echo ']'; $space = ', '; } </code></pre> <p>That should echo out what you are after. Please not that I haven't tested this code.</p>
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    1. POConstructing an Array for Dataset - Different Start Points?
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