CorePlot; How to skip data when using doubleForPlot instead of numberForPlot

问题

I have a CPTScatterPlot with a huge amount of data. I have found that I could reduce the memory overhead (and thus time) by using doubleForPlot instead of numberForPlot in CorePlot.

But when using numberForPlot I have the option to return nil if some data are missing. CorePlot will then make a break in the graph and not connect the neighbor points.

Is the same possible when using doubleForPlot? Is there some exceptional value that I can return and the CorePlot will treat this as a missing point?

Thanks Eric! ;)

回答1:

Return NAN for missing values.

回答2:

Did you try an empty c array? Theoretically should work.

• @return A retained C array of data points.

-(double *)doublesForPlot:(CPTPlot *)plot field:(NSUInteger)fieldEnum recordIndexRange:(NSRange)indexRange;

来源：https://stackoverflow.com/questions/19684234/coreplot-how-to-skip-data-when-using-doubleforplot-instead-of-numberforplot