# Customize Error Bars in Presentation Charts Using Java

> Learn how to add and customize error bars in charts with Aspose.Slides for Java—optimize data visuals in PowerPoint presentations.

Source: https://docs.aspose.com/slides/java/error-bar/
Updated: 2026-08-02


## **Overview**

This article explains how to work with error bars in presentation charts by using Aspose.Slides. It shows how to add error bars to a chart series, configure X and Y error bar settings, and apply different value types such as fixed, percentage, and custom values.

It also demonstrates how to assign custom error bar values for individual data points in a series by using the corresponding data point collection. In addition, the article includes brief notes about how error bars behave during export, their compatibility with markers and data labels, and where to find the related API reference classes and enums.

## **Add Error Bars**
Aspose.Slides for Java provides a simple API for managing error bar values. The sample code applies when using a custom value type. To specify a value, use the **ErrorBarCustomValues** property of a specific data point in the [**DataPoints**](https://reference.aspose.com/slides/java/com.aspose.slides/IChartSeriesCollection) collection of series:

1. Create an instance of the [Presentation](https://reference.aspose.com/slides/java/com.aspose.slides/Presentation) class.
1. Add a bubble chart on desired slide.
1. Access the first chart series and set the error bar X format.
1. Access the first chart series and set the error bar Y format.
1. Setting bars values and format.
1. Write the modified presentation to a PPTX file.

```java
// Create an instance of Presentation class
Presentation pres = new Presentation();
try {
    // Creating a bubble chart
    IChart chart = pres.getSlides().get_Item(0).getShapes().addChart(ChartType.Bubble, 50, 50, 400, 300, true);

    // Adding Error bars and setting its format
    IErrorBarsFormat errBarX = chart.getChartData().getSeries().get_Item(0).getErrorBarsXFormat();
    IErrorBarsFormat errBarY = chart.getChartData().getSeries().get_Item(0).getErrorBarsYFormat();

    errBarX.isVisible();
    errBarY.isVisible();
    errBarX.setValueType((byte) ErrorBarValueType.Fixed);
    errBarX.setValue(0.1f);
    errBarY.setValueType((byte) ErrorBarValueType.Percentage);
    errBarY.setValue(5);
    errBarX.setType((byte) ErrorBarType.Plus);
    errBarY.getFormat().getLine().setWidth(2.0f);
    errBarX.hasEndCap();

    // Saving presentation
    pres.save("ErrorBars.pptx", SaveFormat.Pptx);
} finally {
    if (pres != null) pres.dispose();
}
```

## **Add Custom Error Bar Values**
Aspose.Slides for Java provides a simple API for managing custom error bar values. The sample code applies when the [**IErrorBarsFormat.ValueType**](https://reference.aspose.com/slides/java/com.aspose.slides/IErrorBarsFormat#getValue--) property is equal to **Custom**. To specify a value, use the **ErrorBarCustomValues** property of a specific data point in the [**DataPoints**](https://reference.aspose.com/slides/java/com.aspose.slides/IChartSeriesCollection) collection of series:

1. Create an instance of the [Presentation](https://reference.aspose.com/slides/java/com.aspose.slides/Presentation) class.
1. Add a bubble chart on desired slide.
1. Access the first chart series and set the error bar X format.
1. Access the first chart series and set the error bar Y format.
1. Access the chart series individual data points and setting the Error Bar values for individual series data point.
1. Setting bars values and format.
1. Write the modified presentation to a PPTX file.

```java
// Create an instance of Presentation class
Presentation pres = new Presentation();
try {
    // Creating a bubble chart
    IChart chart = pres.getSlides().get_Item(0).getShapes().addChart(ChartType.Bubble, 50, 50, 400, 300, true);

    // Adding custom Error bars and setting its format
    IChartSeries series = chart.getChartData().getSeries().get_Item(0);
    IErrorBarsFormat errBarX = series.getErrorBarsXFormat();
    IErrorBarsFormat errBarY = series.getErrorBarsYFormat();
    errBarX.isVisible();
    errBarY.isVisible();
    errBarX.setValueType((byte) ErrorBarValueType.Custom);
    errBarY.setValueType((byte) ErrorBarValueType.Custom);

    // Accessing chart series data point and setting error bars values for
    // individual point
    IChartDataPointCollection points = series.getDataPoints();
    points.getDataSourceTypeForErrorBarsCustomValues().setDataSourceTypeForXPlusValues((byte) DataSourceType.DoubleLiterals);
    points.getDataSourceTypeForErrorBarsCustomValues().setDataSourceTypeForXMinusValues((byte) DataSourceType.DoubleLiterals);
    points.getDataSourceTypeForErrorBarsCustomValues().setDataSourceTypeForYPlusValues((byte) DataSourceType.DoubleLiterals);
    points.getDataSourceTypeForErrorBarsCustomValues().setDataSourceTypeForYMinusValues((byte) DataSourceType.DoubleLiterals);

    // Setting error bars for chart series points
    for (int i = 0; i < points.size(); i++) {
        points.get_Item(i).getErrorBarsCustomValues().getXMinus().setAsLiteralDouble(i + 1);
        points.get_Item(i).getErrorBarsCustomValues().getXPlus().setAsLiteralDouble(i + 1);
        points.get_Item(i).getErrorBarsCustomValues().getYMinus().setAsLiteralDouble(i + 1);
        points.get_Item(i).getErrorBarsCustomValues().getYPlus().setAsLiteralDouble(i + 1);
    }

    // Saving presentation
    pres.save("ErrorBarsCustomValues.pptx", SaveFormat.Pptx);
} finally {
    if (pres != null) pres.dispose();
}
```

## **FAQ**

### What happens to error bars when exporting a presentation to PDF or images?

They are rendered as part of the chart and preserved during conversion along with the rest of the chart formatting, assuming a compatible version or renderer.

### Can error bars be combined with markers and data labels?

Yes. Error bars are a separate element and are compatible with markers and data labels; if elements overlap, you may need to adjust formatting.

### Where can I find the list of properties and classes for working with error bars in the API?

In the API reference: the [ErrorBarsFormat](https://reference.aspose.com/slides/java/com.aspose.slides/errorbarsformat/) class and the related classes [ErrorBarType](https://reference.aspose.com/slides/java/com.aspose.slides/errorbartype/) and [ErrorBarValueType](https://reference.aspose.com/slides/java/com.aspose.slides/errorbarvaluetype/).