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).

Input Ports

Icon
Data table containing the categories and values to be plotted in a heatmap.

Output Ports

Icon…
Rendered PNG image.

Popular Predecessors

Popular Successors

Views

Heatmap
A heatmap visualization of the input data.

Workflows

Links

Developers

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Installation

To use this node in KNIME, install the extension KNIME Views from the below update site following our NodePit Product and Node Installation Guide:

v5.4

A zipped version of the software site can be downloaded here.

Plugin provider: KNIME AG, Zurich, Switzerland
Plugin version: 5.4.0.v202411261305
On NodePit since: 2024-12-06
Last update: 2024-12-17
KNIME versions: Since v5.2

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