Pie Chart

The view can be accessed either via the “Open view” action on the executed node or on KNIME Hub.
In the node configuration, you can choose the aggregation method and enable certain controls, which are then available in the view. This includes the ability to choose different columns for categories and frequencies or the possibility to set a title. The configuration also offers a preview of the view, which should help to get the pie chart in the desired shape quickly. Since missing values as well as NaN (not a number) or infinite values cannot be displayed in the view, they will be omitted.

Interactivity between multiple views is currently only possible for views coming from the KNIME Views extension.

Options

Category dimension

Select the column that contains the category values. Note: Missing values are treated as separate category.

Frequency dimension

Select the column that contains the frequency values. Note: Missing values in the frequency column will be ignored with a corresponding warning message. If, after aggregation, some categories contain only missing values, they will be excluded from the view and a warning message will be raised.

Aggregation

Select the aggregation method used on the selected frequency column. In case of “None” every row of the table is treated as a separate category. Note that in this case duplicate categories can exist. In case of “Occurrence Count” the occurrence of the unique values of the selected category column is determined.

Aggregate small categories

When checked, the slices whose percentage lies below a specified threshold are aggregated to a separate slice.

Threshold

Slices with a percentage below this threshold are aggregated to a separate slice.

Title

The title of the graph shown above the generated image. If left blank, no title will be shown.

Size

Size of the pie chart relative to the size of the frame.

Donut chart

If checked, the chart will be displayed as a donut chart.

Hole size

Size of the hole relative to the size of the pie chart.

Sort categories by

Select the rule by which the pie slices should be sorted. If a slice of aggregated small categories is displayed, it is excluded from this sorting as it is always the last segment.

Show labels

When checked, the labels of the pie slices are shown.

Label content

Select what is shown by the labels of the pie slices.

Label value format

Select how values should be formatted inside the label.

Label position

Select where the labels of the slices should be positioned.

Display legend

When checked, the chart’s legend is displayed.

Label for aggregated categories

The label of the slice resulting from aggregating small categories below the specified threshold.

Enable image download

When checked, an image of the chart can be downloaded by clicking the image download button in the view.

Show tooltip

When checked, hovering over a pie chart segment will show information about the data.

Tooltip value format

Select how values should be formatted inside the tooltip.

Selection

“Show” makes this view receive notifications about changes of the selection. “Edit” also allows you to change the selection and propagate any changes you make here to other views that show the selection.

Enable animation

When checked, the animation of the graph is active.

Generate image

If checked, adds an image output port and, upon execution, generates an image which is made available via this port.

Image type (SVG, PNG)

Choose between the superior quality provided by SVG vector graphics and the better performance of the PNG raster images. SVG graphics are sharp, also when zoomed, and text labels within the graphic can be searched for. On the other hand, PNG images can be smaller and render faster when there are many data points, for example, in a scatter plot.

Width

The width of the generated image (in pixels).

Height

The height of the generated image (in pixels).

Views

Pie Chart

A pie chart visualization of the input data.

Workflows

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