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    <p>In this case, you should use <code>-[CPPlotSpace scaleToFitPlots:]</code>. For more general calculations on array values, read on...</p> <p>This is an ideal use for Key-Value coding and associated <a href="http://developer.apple.com/mac/library/documentation/cocoa/conceptual/KeyValueCoding/Concepts/ArrayOperators.html#//apple_ref/doc/uid/20002176" rel="noreferrer">array operators</a>. In your example,</p> <pre><code>float maxX = [[contentArray valueForKeyPath:@"@max.x"] floatValue]; float minY = [[contentArray valueForKeyPath:@"@min.x"] floatValue]; float maxY = [[contentArray valueForKeyPath:@"@max.y"] floatValue]; float minY = [[contentArray valueForKeyPath:@"@min.y"] floatValue]; </code></pre> <p>The array operators call <code>valueForKeyPath:</code> on the <code>contentArray</code> which gives an array built by calling the same <code>valueForKeyPath:</code> on each member of the array with the key path to the right of the array operator (i.e. <code>@min</code> and <code>@max</code>). The orignal call then applies the given operator to the resulting array. You could easily define a category on <code>NSArray</code> to give you back a struct of min/max values:</p> <pre><code>typedef struct { float minX; float minY; float maxX; float maxY; } ArrayValueSpace; @implementation NSArray (PlotSpaceAdditions) - (ArrayValueSpace)psa_arrayValueSpace { ArrayValueSpace result; result.maxX = [[contentArray valueForKeyPath:@"@max.x"] floatValue]; result.minX = [[contentArray valueForKeyPath:@"@min.x"] floatValue]; result.maxY = [[contentArray valueForKeyPath:@"@max.y"] floatValue]; result.minY = [[contentArray valueForKeyPath:@"@min.y"] floatValue]; return result; } </code></pre>
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    1. POOBJ-C: Getting the minimum/maximum value in a NSMutableArray
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    1. USBarry Wark
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    1. COThanks Barry, your response was very helpful. Do you know if there is an auto-adjustment feature for axises as well?
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      1. USKevin
    2. COThe `CPAxis` class does support an automatic labeling policy (`CPAxisLabelingPolicyAutomatic`). The axis will, I think, automatically span the plot space so you just need to set the labeling policy to automatic and then tell it to relabel when the plot space changes size.
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    3. CO@BarryWark What if I have 2 or more different arrays to be plotted in the same graph area? How can I take the one smallest and one largest Y value of all the arrays?
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      1. USJuan Andres
 

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