Data viewer

The data viewer shipped with Sympathy for Data allows easy and fast inspection of the data stored in the different data types. It can be either called directly from within Sympathy for Data by double clicking an output port of any executed node or by launching it from the command line as described in the launch options.

Data viewer for tables.

Screenshot of the Data viewer with activated plot.

Preview Table

The appearance of the Data viewer varies depending on the loaded data type. In the tables view a list of available tables is shown on the very left. Selecting different items of the list will bring the selected table data into the table preview. The preview table has a toolbar with some useful functions:

  • The search box allows a quick search of the column names. For further explanation of the functionality, see below.

  • The button with some lines and an arrow is for jumping to a specific row. When data is transposed this will scroll the view horizontally instead of vertically.

  • The document icon toggles between a view of the table’s data and its attributes. In case there are no attributes, this view will be empty.

  • The transpose button flips the table so that rows become columns and columns become rows. This can be useful, for example, when there are many columns with long names, but fewer rows.

  • The three color circle icon toggles the data type background coloring in the data table view on/off.

  • The graph icon toggles the plot view on/off.

Data viewer preview table toolbar.

Screenshot of the preview table toolbar showing the searchbar and toggle buttons.

The preview table also has a right-click context menu allowing quick selection of columns to plot as either x (Plot as x) or y (Plot as y) signal. Multiple columns can be plotted against the same x signal. Show histogram will show a histogram together with some basic statistics of the selected column.

The number of rows and columns (row x column) is shown in a little box on the bottom left of the preview table.


Due to limitations of the underlying GUI framework, tables with more then 71’582’788 rows will be truncated in the table component of the data viewer. This will be shown with a line in red: Data truncated.


The plot has two toolbars, one above and one below the plot area. The one above allows changing of the following parameters:


Specifies the column used for the x axis.


Specifies the columns plotted as y-values. Multi-selection is allowed. Un/checking a column will remove or add it to the plot.


Specifies the column used to plot the histogram. Some statistics regarding the column’s data is shown in an inset in the histogram.

Plot settings

Popup menu with configurable settings for.


This integer value specifies the step size used for resampling in case the upper limit of 10000 points is exceeded. This value will be automatically updated on data refresh.

Plot large data

In case of large data columns, >10 million rows, plotting will be disabled by default and needs to be activated by this checkbox. This checkbox is hidden for datasets not exceeding this limit.


Selecting the number of bins used for the histogram. Hidden in Line plot mode.

Line graph

Sets the plot to a scatter plot of the selected x and y columns.

Histogram graph

Set the plot to a histogram using the last selected/active column in the Y selector. Selecting the histogram plot will hide the X and Y selection boxes and shows the histogram selection box.

The toolbar below the plot area allows for easy zooming, panning, and moving through the zoom/pan state history. It also has the option to save the current figure (Save icon) and alter the appearance of the lines or scatters of the plotted data (checkbox icon).


Plotting large amounts of rows and several columns can result in slow plotting and the GUI might become unresponsive.