Creating a histogram

1. In the Matrices window, in the navigator, select the matrices of your choice.

2. Right-click one of the matrices you selected.

The context menu opens.

3. Choose Create histogram.

Tip: Alternatively, on the tab toolbar, click the Create histogram icon.

The Matrix histogram (Matrix <Matrix name> window opens.

Note: If you select several matrices, instead of the matrix name, the number of the matrices selected is displayed.

4. Click the Insert new intervals icon.

The Add intervals window opens.

5. Make the desired changes.

Element	Description
Lower limit	Lowest interval value Note The lower limit is not included in the interval.
Upper limit	Highest interval value Note The upper limit is part of the interval.
Number of intervals	The number of intervals

Notes: By default, the OD pairs in the matrices selected are classified according to their matrix values. However, you can also perform classification using the matrix values of another matrix. To do so, click the button View options, or from the Matrix histogram menu, choose View options (Classifying a histogram according to another matrix).

6. Confirm with OK.

The intervals are added to the bottom section of the window.

Notes: Alternatively, click the button Open intervals to import the intervals from an attribute file *.att (Importing and exporting list contents).

You can also copy the intervals from another Histogram window. To do so, in the other Histogram window, click the Copy intervals to clipboard symbol. Then click the Paste intervals from clipboard symbol to paste the intervals.

7. You can then edit the intervals, if required.

Notes: To edit the interval limits, double-click them. The lower limit is not included in the interval, the upper limit is part of the interval (a < x ≤ b).

To delete highlighted intervals, on the Histogram window toolbar, click the Delete marked intervals button.

As long as the classification has not been recalculated, edited intervals are labeled in brown.

8. When you have finished editing, click the Recalculate classification symbol or the Recalculate button in the note.

The histogram is then shown in the top section of the window. The values calculated are displayed in the list. The LastShare column contains values of the last calculation.

Notes: Use the Select matrices icon to edit the displayed matrices in this window (Managing matrices in the Matrix window or Histogram window).

The histogram settings can be saved as a layout file (Saving and opening the layout of a Matrix editor, histogram, or matrix comparison window). You can save the intervals to a *.att file (Saving intervals to an attribute file).

If you change matrix values in the selected matrices, the histogram view is automatically refreshed.

If you change intervals after calculating the histogram, the view is not automatically refreshed. The columns are displayed in gray, the values calculated are shown in brown. To refresh the view of the histogram, click the Recalculate classification icon.

In the matrix histogram, you also have the option of filtering the display by zones, OD pairs or matrix values. (Filtering matrix data).