Histogram

Histogram plot is one of the charts available in the Charts Panel. It presents the data for one or multiple object sets/subsets as a binned distribution.

To display the Histogram plot, open the Charts Panel and select the Histogram option  from the Charts selection dropdown menu.

For more detailed information about histograms in general, please refer to the Wikipedia entry for Histogram.

Appearance

Data for the selected measurement is binned. Counts are displayed as bars within the interval limits given by the x-axis ticks, for all object sets/subsets selected from the legend. When hovering above a bar, the counts of all object sets/subsets within that interval are displayed.

General usage

Select measurements

Like other charts, to change the measurement plotted, hover over the measurement name on the x-axis until it turns red and then click to bring up a menu of the available measurements.

Select object sets/subsets

To show/hide object sets/subsets de/select them from the legend.

Select objects

Clicking on any bar on the Histogram will select these objects in the image and in the spreadsheet. To select multiple bars on the Histogram, hold down the Shift or Ctrl key while clicking on the bars to select. A selected bar is shown in red, and if the measurement changes, the selected objects remain selected and their relative positions on the Histogram are still shown in red.

You can also select a range of bars by holding down the left mouse button while dragging the cursor. This allows you to draw a line across multiple columns in the histogram. Release the mouse button to select.

When showing the histogram as bars, selected objects will be shown in red, so if selecting only a subset of objects within a bar (i.e. by selecting objects in spreadsheet or viewer), only a part of that bar might be red - displayed as a stacked bar.

Change bin size

To in-/decrease the bin size, use mouse wheel while hovering above the histogram.

Panning

To pan across the horizontal axis, right-click on the chart and drag horizontally.

Zoom in/out for both axes

To zoom in/out of an axis,

• either move the mouse pointer over an axis and use the mouse wheel to zoom in/out. On the x-axis this will change the minimum and the maximum, depending on the position on the axis. On the y-axis the minimum is fixed - only the maximum will change (as long as the data is not normalized, in that case minimum and maximum are fixed).
• or click on the minimum or maximum tick label of the x-axis or the maximum of the y-axis (if not normalized) to change the number manually.

Reset chart axes

Use the Reset chart axes button to reset axes scaling, bin size and count to default settings.

Context menu options

You can bring up the context menu by right-clicking anywhere in the Charts Panel. The context menu is specific to the Histogram plot and can be used to adjust chart display options.