The histograms calculated in MatterCliff are 'Frequency of discontinuities' histograms. To calculate and display an histogram, simply click on the Histogram button of a Spacing datasheet. You should enter two or more discontinuity data to calculate an histogram.
When a new histogram is calculated, a default Class interval and a Number of classes is used and displayed in the Histo-options dialog box (see Figure 6 below). This box also displays four distribution density laws that can be drawn on the histogram, using the same mean and/or standard deviation as the discontinuity dataset. When changes are made on this box, the new options are applied to the active histogram by clicking on the Apply button.
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Figure 6 : Spacing frequency histogram for spacing data from Priest (1993). On the right : the Histo-options dialog box displying the options used to calculate the histogram
If the New histo option is checked on the Spacing datasheet (see Figure 2), a new histogram is drawn for the current data. The old one becomes can no longer be changed (except for the text that is displayed on it). The text of the labels can be changed by double-clicking on it.