Heatmap

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 columns to use for horizontal and vertical dimensions and enable certain controls, which are then available in the view. This includes the ability to choose different aggregation methods and the column with the data to color map or the possibility to set a title.
The configuration also offers a preview of the view, which should help to get the Heatmap in the desired shape quickly.

Options

Horizontal dimension

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

Vertical dimension

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

Aggregation

Select the aggregation method used on the selected value column. If “None” is selected execution fails if the horizontal dimension contains duplicate values. If “Occurrence Count” is selected, the occurrence of the unique pairs of values of the selected horizontal and vertical column is determined.

Value dimension

Select the column that contains the values.

Title

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

Axis limits

Choose if the axis range should be taken from the domain range or set manually. You might need to use a Domain Calculator or Edit Numeric Domain node before this node.

Horizontal min

Value that sets the horizontal axis minimum.

Horizontal max

Value that sets the horizontal axis maximum.

Vertical min

Value that sets the vertical axis minimum.

Vertical max

Value that sets the vertical axis maximum.

Custom horizontal axis label

The label for the horizontal axis. If the checkbox is deactivated, the label will correspond to the selected dimension. If activated and left blank, no label will be shown.

Custom vertical axis label

The label for the vertical axis. If the checkbox is deactivated, the label will correspond to the selected dimension. If activated and left blank, no label will be shown.

Show value labels

When checked, value labels will be shown for pieces of the heatmap.

Display colormap axis

When checked, the colormap axis is shown.

Colormap label

The label for the colormap. If left blank, no label will be shown.

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.

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

Heatmap

A heatmap visualization of the input data.

Workflows

• 10_Example_for_HeatmapKNIME Hub
• 2022 Survey AnalysisKNIME Hub
• 2022 Survey ResultsKNIME Hub
• 20230403_Pikairos_JustKnimeIt_Season2_Challenge1_ComparingExchangeRatesKNIME Hub
• 78996 - Heat Map based on Geo Data Lat and LongKNIME Hub
• Show all 107 workflows

Links

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Developers