Home > Sample Charts > MinMaxChart > Adding Errorbars to a ScatterPlot

Adding Errorbars to a ScatterPlot

Some data series are best represented by their range at each time-value. This chart is also commonly used for stock-price data where the daily high and low may be combined with opening and closing values to produce a wide variety of typical ‘Wall Street Journal’ plots of the market data.

Experimental data may have errors on the y-dimension, the x-dimension or both. This chart is very similar to the Hi-Lo plot, but uses two MinMax charts to show errors in both X and Y directions.

Note that the scatter is typically the last chart to be drawn, so that the errorbars set the Y-axis range. If the X-errors are very large it may be necessary to set the X-axis range explicitly here. Plotting the data last also has the effect of placing the markers on top of the errorbars, which looks much cleaner.

SharpPlot sp = new SharpPlot;

yield = new int[] {6,8,12,11,17,32,20,28};
temp = new int[] {12,14,23,28,31,34,36,40};
error = new int[] {2,2,4,4,4,12,6,8};

sp.Heading = "Errorbars in 2 Dimensions";
sp.XCaption = "Temperature °C";
sp.YCaption = "Yield (gm)";

sp.SetColors(new Color[]{Color.Navy,Color.Navy,Color.Maroon});
sp.MinMaxChartStyle = MinMaxChartStyles.ErrorBars;
sp.DrawMinMaxChart(AE.Plus(yield,error),AE.Minus(yield,error),temp);

sp.MinMaxChartStyle = MinMaxChartStyles.ErrorBars|MinMaxChartStyles.Horizontal;
sp.DrawMinMaxChart(AE.Plus(temp,1),AE.Minus(temp,1),yield);

sp.SetMarkers(Marker.Bullet);

sp.DrawScatterPlot(yield,temp);

Worked Examples

Send comments on this topic
© Dyalog Ltd 2013